Industrial Tire Sizing Guide for Working Equipment

A tire that physically mounts is not automatically the right tire. On a forklift, telehandler, loader, airport tug, or yard truck, the wrong diameter, rim profile, load rating, or tire construction can affect stability, clearance, downtime, and wear. This industrial tire sizing guide covers how to read common size markings and verify fitment before ordering surplus, new old stock, or used industrial tires.

Start With the Tire Type, Not Just the Numbers

Industrial tire sizing is tied to construction. A pneumatic tire, solid resilient tire, press-on band tire, and foam-filled tire may serve similar equipment, but they do not use the same mounting method or carry the same dimensions. Start by identifying what is currently on the machine and what the manufacturer permits.

Pneumatic tires use an air-filled casing and are common on forklifts, telehandlers, loaders, and rough-terrain equipment. They provide more cushioning and are usually the better choice for uneven ground, gravel, and outdoor work. They also need a compatible rim and may be tube-type or tubeless.

Solid resilient tires are molded rubber tires installed on multi-piece industrial rims. They are built for puncture resistance and hard-surface work, especially warehouses, scrap yards, ports, and facilities where tire damage is costly. Their size may be expressed differently from the pneumatic equivalent, even when both are intended for the same machine.

Press-on band tires use a steel band that is pressed onto a specific wheel hub. They are common on electric forklifts and narrow-aisle equipment. A press-on tire is not interchangeable with a pneumatic tire simply because the outside diameter looks close. The wheel center, band diameter, and mounting system must match exactly.

How to Read Industrial Tire Size Markings

The marking on the sidewall provides the starting point, not the entire answer. Record every number, letter, and rating before comparing inventory. If the old tire is missing or unreadable, use the equipment manual, wheel stamping, or manufacturer fitment data.

Conventional inch-based sizes

Many forklift and industrial pneumatic tires use a format such as 7.00-12 or 10.00-20. The first number is the nominal tire section width in inches. The second number is the rim diameter in inches. In a 7.00-12 tire, the tire is roughly seven inches wide and fits a 12-inch rim.

Some markings include a construction letter, such as 10.00R20. The R identifies radial construction. A dash normally indicates bias-ply construction. That distinction matters because radial and bias tires behave differently under load, heat, and sidewall flex. Do not switch construction types on one axle unless the equipment manufacturer specifically allows it.

Metric sizes

Metric markings often appear as 225/75R17.5. The first number is section width in millimeters. The second is aspect ratio, meaning sidewall height as a percentage of width. The R means radial, and 17.5 is the rim diameter in inches.

A 225/75R17.5 tire is not identified by width alone. Its overall diameter is influenced by the aspect ratio and rim size, so a 225/70R17.5 may fit the same rim but stand shorter. That can change ground clearance, axle height, speedometer readings where applicable, and clearance under fenders or guards.

Flotation and OTR-style sizes

Off-road and industrial equipment may use a format such as 12.5/80-18 or 16.9-24. In 12.5/80-18, 12.5 is nominal section width in inches, 80 is the aspect ratio, and 18 is rim diameter. A size like 16.9-24 generally lists width and rim diameter, while the overall diameter varies by manufacturer and tire design.

Loader, grader, and heavier OTR applications may also use metric radial sizes such as 405/70R20. These numbers still describe basic dimensions, but the tire’s load index, star rating, ply rating, tread depth, and recommended rim width carry equal weight in the fitment decision.

Solid tire sizes

Solid forklift tires may show dimensions such as 28 x 9-15, 6.50-10, or a metric format. The first format commonly gives overall diameter, section width, and rim diameter. However, solid tire dimensions can vary by manufacturer because the tire does not deflect like a pneumatic casing. Compare the approved rim, tire outside diameter, width, and load capacity rather than assuming a similar-looking size is a direct replacement.

Rim Diameter Is Only One Part of Fitment

A 12-inch tire requires a 12-inch rim, but that does not settle the question. Rim width, flange shape, bead seat profile, wheel offset, bolt pattern, center bore, and load capacity can all determine whether the assembly is usable.

Industrial multi-piece rims require special attention. Matching the nominal rim diameter is not enough when lock rings, side rings, or bead seat bands are involved. Components must be the correct type and condition for that wheel. Never mix rim components from different designs or manufacturers unless they are confirmed compatible by the wheel maker.

For press-on tires, verify the wheel or band diameter and width, not just the tire’s outside dimensions. These tires require proper pressing equipment. Trying to improvise installation can damage the tire, wheel, or equipment and creates a serious safety risk.

Match Load Capacity to the Real Job

Industrial tires carry equipment weight, attachment weight, payload, and the shifting forces created while turning, braking, lifting, and operating on slopes. A tire size may fit physically while still lacking the required load rating.

Check the machine’s axle loads, not only its published operating weight. A loaded forklift can place most of its weight on the steer axle or drive axle depending on the load position and travel direction. A loader with a full bucket creates a different load condition than the same machine traveling empty. Attachments, counterweights, and nonstandard forks also change the calculation.

Ply rating is often used on bias tires as an indication of casing strength, but it is not a direct count of physical plies in every modern tire. Load index and manufacturer load tables are more useful where available. Compare the tire’s capacity at the required inflation pressure and operating speed. Underinflation creates heat and sidewall damage; overinflation can reduce traction and ride quality.

For solid tires, load capacity is commonly tied to a specified speed and duty cycle. Long travel distances, frequent high-speed runs, hot pavement, and continuous operation can require a different tire than short, low-speed warehouse service. This is one of the areas where “same size” does not mean “same application.”

Choose the Tread for the Surface and Duty Cycle

Tread selection should follow the jobsite. Smooth solid tires are suited to clean concrete and warehouse floors, where low rolling resistance and stable handling matter. Lug patterns provide traction on dirt, gravel, snow, and loose material but may wear faster on pavement. Deep industrial or R-4-style treads are a practical middle ground for many telehandlers, backhoes, and mixed-surface machines.

For loaders and OTR equipment, tread depth is only part of the decision. Heat buildup, cut resistance, self-cleaning ability, and traction under load matter just as much. A deep tread may look like the obvious choice, but it can generate more heat in long, hard-surface travel. Conversely, a shallow tread can be a poor fit for wet soil, demolition debris, or loose aggregate.

If the machine runs indoors, confirm whether non-marking rubber is required. Non-marking tires protect finished floors but can have different wear and traction characteristics than standard black compounds.

When a Size Change Can Work

A size change is sometimes practical, especially when sourcing specialty or surplus inventory. It should be treated as an engineering check, not a shortcut. Small changes in overall diameter can affect gear ratios, machine height, fork leveling, clearance, and four-wheel-drive operation.

On four-wheel-drive equipment, keep rolling circumference closely matched across driven axles. A mismatch can strain driveline components. On forklifts, preserve the approved front-to-rear tire relationship because tire diameter affects stability and capacity. If you are replacing one tire on a paired axle, match the mate closely for size, construction, tread pattern, and remaining tread depth.

Used industrial tires can offer strong value when the casing or solid body is sound and the measurements match the application. Inspect for sidewall cuts, bead damage, exposed cord, irregular wear, chunking, weather cracking, repairs, and signs of heat damage. With new old stock, verify date codes and storage condition. A tire stored correctly may be a useful buy, but age, cracking, and service history still matter.

Before You Order: Record These Details

For industrial tire fitment, have the full specification ready. A supplier can identify suitable inventory much faster when you provide:

• Complete sidewall size and all load, ply, or star ratings
• Tire construction: pneumatic, solid resilient, press-on, radial, or bias
• Rim diameter, rim width, wheel part number, and wheel center details
• Equipment make, model, axle position, and actual work conditions
• Required tread type, non-marking requirement, and quantity needed

Photos of the tire sidewall and wheel are useful when markings are unclear. For uncommon military, airport, agricultural, OTR, and industrial applications, this can prevent an expensive mismatch before freight is arranged.

MilitaryTires.ca carries specialized surplus and hard-to-source tire inventory for buyers who need specific sizes, wheel configurations, and working-duty tread patterns. Availability changes, so accurate measurements and complete tire markings are the fastest way to identify a workable option.

The best fit is not the tire with the closest-looking numbers. It is the tire and wheel combination that matches the equipment, axle load, surface, speed, and duty cycle. Take the extra few minutes to verify those details before purchase. It is cheaper than losing a shift to a tire that cannot safely do the job.