A tire shredder’s feed size and output size describe two different parts of the recycling process, but both must be considered before selecting a machine.
The maximum feed size determines which waste tires can enter and be processed by the shredder. It depends on the tire diameter, width, weight, bead structure, cutting chamber dimensions, shaft torque, blade design and feeding method.
The output size describes the dimensions of the tire pieces discharged from the machine. A primary tire shredder commonly produces rough tire shreds or TDF chips between approximately 50 and 300 mm. Smaller products, including 10–20 mm wire-free rubber mulch, 1–8 mm crumb rubber and 30–120 mesh rubber powder, require additional processing equipment.
Standard industrial dual-shaft shredders can usually process whole passenger car tires and conventional truck tires. Large agricultural, OTR and mining tires may require bead removal, sidewall cutting, segmentation or pre-shredding before they enter the main shredding system.
Buyers often ask whether a tire shredder can process whole tires or how small it can cut them. Both questions are important, but neither provides enough information on its own.
A tire may fit through the inlet but still be too wide, too heavy or too difficult for the blades to grip efficiently. In the same way, a machine that can reduce whole tires into rough chips may not be able to produce clean crumb rubber or fine rubber powder without additional processing equipment.
Choosing the right tire shredder therefore requires looking at both ends of the process. Buyers should first identify the largest tire the machine will need to handle, including its diameter, width, weight and whether it will be fed whole or pre-cut. They should then define the required finished product, including particle size, purity and final application.
The raw tire specifications determine whether the material can enter and pass through the shredder reliably. The finished-product requirements determine how many shredding, screening and separation stages are needed in the complete tire recycling plant.
Maximum feed size does not simply refer to the dimensions of the shredder inlet.
In a practical tire recycling operation, the effective maximum feed size is the largest whole or pre-cut tire that the shredder can continuously grab, pull, cut and discharge without frequent bridging, overload, reversing or material blockage.
Waste tires behave differently from ordinary rigid materials. They are elastic, reinforced with steel wire and textile fiber, and may deform during storage and feeding.
Even when a tire can physically pass through the feeding hopper, the machine may still struggle if the tire is wider than the effective cutting chamber, has an unusually heavy bead structure or creates excessive impact load during feeding.
Feeding may also become unstable when the blade hooks cannot grip the tire properly, when tires are severely deformed or when they contain mud, stones or metal contamination.
For this reason, tire diameter is only one part of the feed-size evaluation. Tire width, weight, construction and feeding condition are equally important.
Passenger tires, truck tires, agricultural tires and OTR tires vary significantly in diameter, width, weight and steel content. They therefore require different feeding and pretreatment methods.
| Tire Type | Typical Diameter Range | Typical Feeding Method | Pretreatment Normally Required | Key Processing Considerations |
| Passenger Car Tire | Approximately 600–800 mm | Whole-tire automatic feeding | Usually not required | Relatively light and easy to feed, making it suitable for standard dual-shaft tire shredders |
| Truck and Bus Tire | Approximately 800–1100 mm | Whole-tire or pre-cut feeding | Bead removal may be recommended | Thicker rubber and higher steel content increase cutting resistance and blade load |
| Agricultural Tire | Approximately 1000–1300 mm | Whole feeding where suitable or preferential pre-cut feeding | Sidewall cutting and bead removal may be required | Large width and thick sidewalls can cause bridging and uneven shaft loading |
| Standard OTR Tire | Approximately 1300–1800 mm | Segmented or pre-cut feeding | Sidewall cutting, bead removal or pre-shredding usually required | High single-tire weight and dense steel reinforcement make direct whole-tire processing difficult |
| Large Mining Tire | Above approximately 1800 mm | Customized heavy-duty pretreatment and feeding | Complete segmentation and multi-stage pretreatment | Usually requires an OTR cutter, hydraulic feeding system and customized large-chamber shredder |
These ranges are general references rather than universal limits. The actual acceptable tire dimensions depend on the shredder model, cutting chamber width, blade configuration, torque reserve and feeding system.
Two tires with the same outside diameter may require completely different shredding equipment.
For example, a truck tire with a diameter of 1200 mm and a width of 350 mm does not create the same feeding and cutting conditions as an agricultural tire with the same diameter but a width of 600 mm.
Tire width determines how much material contacts the blade shafts at one time.
An ultra-wide tire may not settle evenly into the cutting chamber. It can remain suspended above the shafts, create uneven loading or require repeated reversing before the blades can pull it into the machine.
When tire width exceeds the practical feeding range, the machine may experience incomplete blade engagement, material bridging, uneven shaft load, frequent reversing and lower hourly throughput.
Heavy truck, agricultural and OTR tires create a large impact load when they are dropped into the feeding hopper.
The shredder must have sufficient shaft torque, structural strength and reducer capacity to withstand this load. A tire may fall within the nominal diameter range but still be unsuitable for direct feeding because of its weight.
The tire bead is one of the strongest parts of a waste tire.
Thick and intact bead wire increases cutting resistance, motor load and blade wear. It can also become entangled around the shafts and make downstream steel separation more difficult.
Bead removal is not always compulsory, but it may improve operating stability when processing heavy truck tires, agricultural tires and OTR tires.
Passenger car tires and heavy-duty truck tires have different internal structures.
Truck and bus tires normally contain more steel reinforcement and thicker rubber sections. Agricultural and OTR tires may have heavy bead bundles, thick sidewalls and deep tread blocks.
The tire type and steel content therefore affect both the maximum feed size and the actual production capacity.
Severely deformed tires may be more difficult for the blades to grip, even when their original dimensions are within the machine’s stated feed range.
Tires containing mud, stones, scrap metal or other foreign materials can also cause unstable feeding, abnormal blade damage, increased wear, lower product purity and more frequent maintenance.
The difficulty of shredding a waste tire should therefore not be judged only by whether the tire appears new, old or heavily worn.
The choice between whole-tire feeding and pre-cut feeding affects automation, equipment investment, labor demand, maintenance and production stability.
Whole-tire feeding is commonly used for passenger tires, light truck tires and many conventional truck tires.
This method reduces the need for manual pretreatment and makes the production process easier to automate. It also simplifies material handling, reduces the number of processing stages and can lower labor costs.
Whole tires can be loaded by conveyor or other automatic feeding equipment and delivered directly to the primary shredder.
However, this method may not be suitable when the tire is too wide, too heavy or reinforced with an exceptionally strong bead structure.
Large tires may create high instantaneous load and can remain suspended inside the hopper instead of entering the cutting chamber smoothly.
Pre-cut feeding is commonly used for large agricultural, OTR and mining tires that exceed the practical whole-tire processing range of the primary shredder.
Depending on the tire type, pretreatment may involve bead wire removal, sidewall cutting, tread separation, strip cutting, block cutting or hydraulic segmentation.
Reducing an oversized tire into smaller sections allows it to enter a more compact cutting chamber and makes it easier for the blade hooks to grip the material.
Pre-cutting also reduces instantaneous impact load, limits bead-wire entanglement, improves feeding stability and can extend blade service life.
Suitable pretreatment equipment may include tire debeaders, sidewall cutters, tire cutters, OTR tire cutters and hydraulic pre-cutting machines.
The main disadvantage is the additional investment and the extra handling steps required before primary shredding. The decision should therefore be based on the proportion of oversized tires and the required continuous production capacity.
The shaft structure affects how the machine grips elastic tires and how sensitive it is to tire dimensions and shape.
A dual-shaft tire shredder is commonly used for primary tire reduction and whole-tire feeding.
The two rotating blade shafts grab, pull, shear and tear the tire from both sides. This structure is well suited to elastic, irregular and steel-reinforced materials.
The active grabbing action allows a dual-shaft machine to process whole tires more reliably than equipment that depends mainly on an external pusher.
Dual-shaft shredders are also valued for their high torque at low speed, stable handling of irregular tire shapes and adaptability to a relatively wide feed-size range.
For these reasons, this structure is widely used as the front-end waste tire shredder in industrial recycling lines.
A single-shaft shredder normally relies on a hydraulic pusher to move material toward a rotating cutting rotor.
Single-shaft equipment can process some tire-derived materials, pre-cut rubber pieces and secondary feedstocks, but it is generally more sensitive to the size, shape and elasticity of whole tires.
It would be inaccurate to say that every single-shaft shredder has a smaller feed size than every dual-shaft model because actual capability depends on the specific machine design.
However, for industrial whole-tire primary shredding, a dual-shaft structure is usually more suitable because it can actively grab and pull the tire into the cutting zone.
Feeding tires that exceed the practical feed limit can reduce efficiency and increase equipment failure risks.
The tire may fail to enter the feeding inlet smoothly or become suspended inside the hopper. In some cases, the blade hooks rotate without gripping the material firmly enough to pull it into the cutting chamber.
The motor may overload repeatedly, causing the PLC to initiate frequent automatic reversing. Continued unstable feeding can also block the conveyor, increase load on the blades, bearings and reducers, and cause bead wire to become entangled around the shafts.
These conditions often lead to lower hourly capacity, inconsistent discharge size, more frequent shutdowns and increased maintenance requirements.
A tire fitting through the inlet therefore does not guarantee that it can be processed efficiently or that the machine can reach its rated capacity.
Rated shredder capacity is normally based on clearly defined raw-material and output conditions.
If the tire dimensions are close to the machine’s maximum feed limit, each tire may require more gripping, cutting and reversing cycles. The material remains in the cutting chamber for longer, which reduces effective throughput.
Production capacity may also decrease when the feed contains a high proportion of truck tires, wide agricultural tires, OTR tires, heavy bead structures, steel-rich tire sections or contaminated and deformed tires.
When comparing quotations, buyers should make sure that every supplier is calculating capacity under the same feed conditions.
A capacity figure based on sorted passenger tires cannot be compared directly with a figure based on mixed passenger and truck tires.
Tire shredder output size refers to the approximate dimensions of the tire pieces discharged after cutting, screening and recirculation.
It may be expressed in millimeters, inches or mesh, depending on the processing stage and final product.
Common output ranges include 150–300 mm rough tire shreds, 50–150 mm TDF chips, 20–50 mm secondary tire chips, 10–20 mm wire-free rubber mulch, 1–8 mm crumb rubber and 30–120 mesh fine rubber powder.
A primary tire shredder is designed to reduce whole or pre-cut tires into rough pieces. It does not normally produce clean crumb rubber or fine powder directly.
Smaller and cleaner products require additional processing equipment such as disc screens, return conveyors, raspers, magnetic separators, granulators, vibrating screens, fiber separators, rubber powder mills, classifiers, cooling systems and dust collectors.
| Target Output Size | Typical Product | Main Applications | Typical Equipment Configuration |
| 150–300 mm | Rough tire shreds or tire-derived aggregate | Volume reduction, transport, civil engineering and further processing | Primary tire shredder and discharge conveyor |
| 50–150 mm | TDF chips | Cement kilns, industrial boilers and alternative fuel preparation | Tire shredder, disc screen and return conveyor |
| 20–50 mm | Secondary tire chips | Pyrolysis feedstock, mulch preparation and granulator feeding | Primary shredder, secondary shredder or rasper and magnetic separator |
| 10–20 mm | Wire-free rubber mulch | Landscaping, playgrounds, sports surfaces and crumb rubber feedstock | Shredder, rasper, magnetic separator and screening system |
| 1–8 mm | Crumb rubber or rubber granules | Rubber tiles, mats, running tracks, artificial turf and molded products | Shredder, rasper, granulator, magnetic separator, fiber separator and vibrating screen |
| 30–120 mesh | Fine rubber powder | Modified asphalt, reclaimed rubber, compounds, seals, soles and fillers | Complete crumb rubber line, rubber powder mill, classifier and cooling system |
These values are general project-planning ranges. The final output specification must be confirmed according to the final application, downstream buyer requirements, steel content, purity requirements and target capacity.
The best output size is not necessarily the smallest size the machine can technically produce.
A more practical starting point is to confirm what product the final customer is willing to purchase and what size and purity requirements apply to that product.
Rough tire shreds are suitable for first-stage volume reduction and preparation for further processing.
Whole tires occupy a large amount of storage and transport space. Reducing them to rough pieces makes loading, transportation and downstream feeding easier.
This size range may also be used for certain civil engineering, drainage or landfill applications where local specifications allow tire-derived aggregate.
A primary dual-shaft shredder may be sufficient when strict particle-size control is not required. If the customer specifies a maximum size, a screening and recirculation system should be added.
Tire-derived fuel is commonly used in cement kilns, lime kilns, industrial boilers and other high-temperature industrial processes.
Many TDF projects use tire chips in the approximate range of 50–150 mm. Some end users require a narrower range, such as 50–100 mm, while others specify a maximum size such as 50 mm minus.
A typical TDF line includes a feeding conveyor, dual-shaft tire shredder, disc screen, oversize return conveyor, qualified-product conveyor and PLC control system. Magnetic separation may also be added when the fuel user limits loose or exposed steel.
The screen separates qualified chips from oversized pieces. Oversized material is automatically returned to the shredder for another cutting cycle.
Before the equipment is selected, the buyer should confirm the required chip size, allowable oversize percentage, exposed-wire tolerance, hourly capacity and the acceptance criteria of the cement kiln or boiler.
This output range is normally an intermediate material rather than finished crumb rubber.
It may be used as pyrolysis feedstock, mulch preparation material, granulator feedstock, secondary fuel or feed material for further steel liberation.
Producing consistent 20–50 mm chips may require a secondary shredder or rasper rather than simply fitting a smaller screen to the primary shredder.
As the target size decreases, material recirculation, energy consumption and blade wear normally increase.
Wire-free rubber mulch requires both size reduction and steel separation.
A typical rubber mulch production line may include primary tire shredding, screening, secondary reduction, steel-wire liberation, magnetic separation, particle-size classification, fiber control and optional coloring and bagging.
Particle size alone does not determine whether rubber mulch is suitable for sale.
The final product may also be evaluated according to residual steel, exposed wire, textile fiber, particle shape, dust percentage, color, packaging method and the requirements of the intended landscaping or playground application.
Crumb rubber cannot normally be produced directly from whole tires by one primary shredder.
A complete crumb rubber line usually includes a primary tire shredder, disc screen, return conveyor, rasper, magnetic separators, rubber granulator, vibrating screen, fiber separator, air separation system and dust collection system.
Common products include 1–2 mm, 1–3 mm, 2–4 mm, 3–5 mm, 4–6 mm and mixed 1–6 mm or 1–8 mm rubber granules.
These materials may be used in rubber tiles, playground flooring, running tracks, artificial turf, gym mats, molded rubber products and rubber-modified asphalt.
At this stage, steel content, textile fiber, dust, moisture and particle-size distribution are just as important as the nominal granule size.
Fine rubber powder is produced from clean rubber granules using specialized grinding and classification equipment.
The finer the target powder, the more important temperature control, classification accuracy and dust management become.
A rubber powder line may include a complete crumb rubber system, powder mill, cooling system, air classifier, vibrating screen, dust collector, pneumatic conveying and automatic weighing and bagging equipment.
Fine rubber powder may be used in modified asphalt, reclaimed rubber, rubber compounds, shoe soles, seals, waterproof products, rubber boards and industrial fillers.
A primary tire shredder can be adjusted within a certain output range, but one machine cannot efficiently produce every tire recycling product.
Blade thickness, hook geometry, tooth quantity, shaft speed, screen opening, disc spacing, return-conveyor design, feed rate, tire type and steel content all influence the final chip size.
For example, the same primary shredder may be configured to produce rough 100–150 mm shreds or smaller 50–100 mm TDF chips.
However, forcing a primary shredder to produce excessively small particles can sharply reduce production capacity and increase recirculation, blade wear, power consumption and maintenance.
Smaller screens can also increase rubber temperature and make steel-wire entanglement more likely.
The more efficient approach is to use different machines for different size-reduction stages.
Blade thickness influences the approximate width of the discharged tire pieces.
Thicker blades generally produce larger pieces and offer greater structural strength. Thinner blades can help reduce output size, but they must be carefully matched with the shaft torque, blade material and steel content of the tires.
The hook profile affects how the tire is grabbed, pulled and torn.
A more aggressive hook may improve feeding, but it also increases instantaneous load. The blade design must therefore be matched with the shaft, reducer and motor.
The screening system determines which tire pieces can leave the shredding circuit.
Qualified pieces pass through the screen, while oversized pieces return to the shredder.
A smaller screen opening generally produces smaller output, but it also increases recirculation, reduces hourly capacity and raises energy consumption and blade wear.
Overfeeding can cause unstable cutting, excessive recirculation, motor overload and irregular output.
A controlled feeding conveyor helps maintain stable production and more consistent chip size.
A return conveyor is important when the buyer requires controlled TDF chip size.
Without recirculation, oversized pieces may be mixed with qualified output. A closed-loop system automatically returns oversized material while allowing qualified chips to continue to the next stage.
Feed size and output size both influence actual production capacity.
Oversized, wide or heavy tires reduce feeding efficiency and increase the time required for each cutting cycle.
Smaller output sizes require more cutting passes, more screening and more material recirculation.
A realistic capacity calculation should therefore consider tire type, maximum diameter, maximum width, single-tire weight, the passenger-to-truck-tire ratio, whether the tires are whole or pre-cut, whether bead wire is removed, the target output size, allowable oversize percentage and downstream equipment capacity.
A shredder producing 100–150 mm rough chips will normally have a higher throughput than the same machine producing approximately 50 mm chips.
Suppliers should therefore not quote capacity without clearly defining both the feed and output conditions.
| Final Product | Recommended Line Configuration | Main Information to Confirm |
| 150–300 mm Rough Shreds | Feeding conveyor + primary tire shredder + discharge conveyor | Maximum tire size, tire type, required capacity and acceptable output variation |
| 50–150 mm TDF Chips | Feeding conveyor + tire shredder + disc screen + return conveyor + optional magnetic separator | TDF specification, oversize tolerance, exposed steel requirement and fuel-buyer criteria |
| 20–50 mm Secondary Chips | Primary shredder + secondary shredder or rasper + magnetic separator | Final use, steel tolerance, target size and whether the product is intermediate feedstock |
| 10–20 mm Wire-Free Mulch | Primary shredder + rasper + magnetic separator + screening and collection system | Steel content, fiber content, appearance, coloring and packaging requirements |
| 1–8 mm Crumb Rubber | Primary shredder + rasper + magnetic separation + granulator + vibrating screen + fiber separator | Particle-size fractions, purity, final application and required hourly output |
| 30–120 Mesh Rubber Powder | Complete crumb line + powder mill + cooling system + classifier + dust collection and bagging | Mesh range, temperature, classification accuracy, dust control and packaging |
Tire diameter alone does not describe the actual feed condition.
The buyer should also provide the tire width, weight, type, bead structure and whether the tire will be fed whole or pre-cut.
A tire fitting into the inlet does not guarantee stable processing.
The machine must also be able to grip the tire, pull it into the cutting chamber and process it without frequent reversing or overload.
A line designed mainly for passenger and truck tires may not process large OTR tires directly.
Oversized tires may require bead removal, sidewall cutting, hydraulic segmentation, customized feeding, a larger cutting chamber and higher shaft torque.
A primary shredder can prepare feedstock, but it cannot normally produce clean 1–5 mm crumb rubber directly from whole tires.
Crumb rubber production requires additional steel separation, granulation, fiber separation and screening stages.
A smaller screen does not automatically create a more valuable product.
It may reduce capacity, increase recirculation, raise power consumption and accelerate blade wear.
The target output size should be based on the final market rather than the smallest technical possibility.
Two suppliers may quote the same nominal capacity while using different feed and output assumptions.
One quotation may be based on passenger tires and 100–150 mm output, while another may be based on mixed truck tires and 50 mm output.
These capacities are not directly comparable.
The equipment supplier should know whether the feed consists of passenger, truck, bus, agricultural, OTR, mining or mixed tires.
The buyer should also provide the maximum outside diameter, maximum width, average and maximum single-tire weight, proportion of each tire type and whether the tires are whole, cut or de-beaded.
Any mud, stones, scrap metal or other contamination should be disclosed. Photos of representative raw tires are also useful for model selection.
The target output size, acceptable particle-size range and maximum allowable oversize percentage should be confirmed before the line is designed.
The supplier should also know the final application, required steel and fiber content, acceptable dust level and whether the product will be stored in bulk or packed in bags.
The buyer should provide the required hourly capacity, operating hours per day, number of shifts, annual processing volume, required continuous running time and desired automation level.
Workshop dimensions, available electrical power, voltage, frequency, feeding method and finished-product storage plan should all be considered.
Local requirements related to dust, noise, safety and installation environment may also affect the equipment configuration.
With this information, HVST can determine whether the project requires a primary shredder, a TDF system, a wire-free mulch line, a crumb rubber plant or a complete rubber powder production line.
Yes. Standard industrial dual-shaft tire shredders can normally process whole passenger car tires without pretreatment.
Heavy-duty dual-shaft shredders can process many conventional truck and bus tires directly. Bead removal or pre-cutting may be recommended for very wide, heavy or steel-rich tires.
There is no universal maximum diameter for every tire shredder. The practical limit depends on tire diameter, width, weight, cutting chamber size, shaft torque and feeding method.
Many conventional industrial systems are designed for passenger and truck tires, while large agricultural and OTR tires require pretreatment or customized equipment.
Some smaller OTR tires may be accepted by customized heavy-duty systems. Large OTR and mining tires normally require bead removal, sidewall cutting or complete segmentation before primary shredding.
Yes. Tire width can have a major effect on blade engagement, hopper bridging, shaft balance and actual production capacity. It should always be provided together with tire diameter.
Not always. Passenger tires and many conventional truck tires can be processed with their bead wire intact.
However, bead removal can reduce cutting resistance, lower the risk of shaft entanglement, improve blade life and support downstream steel separation.
Yes. Many industrial dual-shaft shredders can process a mixture of passenger and truck tires.
The production capacity should be calculated according to the truck-tire percentage because truck tires normally contain more rubber and steel.
An ordinary shredder is generally not suitable for processing both whole passenger tires and large whole OTR tires under the same feeding conditions.
OTR tires usually require pretreatment to reduce them to a feed size compatible with the primary shredder.
Common primary shredding outputs are approximately 50–300 mm, depending on the blade configuration, screening system, tire type and final application.
Many TDF projects use tire chips in the approximate range of 50–150 mm.
The final specification should be confirmed with the cement kiln, boiler or other fuel user before the equipment is ordered.
A primary tire shredder cannot normally produce clean 1–5 mm crumb rubber directly from whole tires.
A complete line requires secondary reduction, steel separation, granulation, fiber separation and screening.
Smaller output requires more cutting passes, more recirculation and longer material residence time.
This increases blade contact, energy consumption and wear while reducing hourly throughput.
Tire shredder feed size and output size should never be evaluated separately.
The feed size determines whether passenger, truck, agricultural or OTR tires can enter and be processed reliably. The output size determines the final product, downstream processing stages, production capacity, energy consumption and total line investment.
A professional tire shredder selection should consider the maximum tire diameter, maximum width, single-tire weight, tire type, steel structure, feeding method, cutting chamber dimensions, shaft torque, blade design, target output size, final product purity and required hourly capacity.
Passenger and conventional truck tires can often be processed through whole-tire feeding. Large agricultural, OTR and mining tires may require bead removal, sidewall cutting, segmentation or pre-shredding.
For rough shreds and TDF chips, a primary tire shredder with screening and recirculation may be sufficient. Wire-free mulch, crumb rubber and fine rubber powder require additional reduction, separation, screening and grinding stages.
The correct approach is to define both ends of the process: the largest raw tire entering the line and the final product leaving the line.
The complete tire recycling equipment configuration can then be designed to achieve stable feeding, consistent output, lower wear and reliable long-term production.
