Recognize the main size formats
Commercial buyers commonly encounter formats such as 11R22.5, 295/75R22.5, 285/75R24.5, and 225/70R19.5. The characters describe dimensions and construction, but they do not fully define interchangeability. Overall diameter, section width, approved rim width, static loaded radius, revolutions per mile, load range, and application can differ. Record the complete tire and wheel information from the vehicle, not a shortened size copied from an invoice.
Match the axle position and duty cycle
Steer, drive, trailer, and all-position products use different tread and casing priorities. A local delivery route with frequent turns creates different scrub and traction demands from long-haul interstate work. Construction sites, refuse service, buses, regional haul, and mixed service add their own heat, impact, start-stop, and casing risks. State axle position, route type, typical load, annual mileage, road surface, and weather in an RFQ so suppliers can quote an application, not only a dimension.
Confirm load and inflation data
Use authoritative load and inflation information for the exact tire, wheel, axle, and single or dual configuration. Dual assemblies require compatible dimensions and adequate spacing; mismatched diameter or pressure can overload one tire. Never infer operating pressure from a marketplace description or use the sidewall maximum as a universal fleet setting. Weighing and maintenance decisions should follow the fleet's qualified technical process, tire manufacturer data, vehicle requirements, and applicable rules.
Check wheel and clearance compatibility
A nominally similar size can change rim requirements, clearance, gearing, speed indication, ride height, and dual spacing. Verify wheel diameter, width, offset, load rating, valve hardware, brake clearance, and mounting condition. When considering a low-profile conversion or alternate size, obtain an approved conversion analysis. Marketplace sellers should disclose whether tires are loose, mounted, new, retread, take-off, used, or casing-only and should never imply that a size conversion is universally approved.
Include casing and retread strategy
Commercial value continues after the first tread when the casing is suitable for retreading and the fleet can track it. Ask about casing brand, age, repair history, previous retreads, inspection method, retread warranty, casing credit, and reject handling. A low acquisition price can be poor value if the casing has limited future use. Fleets comparing new and retread options should use a common cost-per-mile model and separate tire performance from emergency service and downtime costs.
Write a quote-ready commercial request
Include size, load range, axle position, quantity, vehicle type, route, ZIP, delivery deadline, installation location, current brand or pattern, new or retread preference, casing program, national-account needs, roadside coverage, and recurring demand. Ask each supplier to separate tire price, federal or local charges where applicable, freight, mounting, disposal, service, warranty, and lead time. Clear fields turn a generic lead into a procurement request that can be compared.
Sources and further reading
These primary and authoritative resources support the manual's research. Always use the current vehicle, tire, manufacturer, and regulatory guidance for a specific decision.
- 49 CFR 393.75 - TiresElectronic Code of Federal Regulations
- Commercial Tire Safety TipsFederal Motor Carrier Safety Administration
Common questions
Can 11R22.5 and 295/75R22.5 be exchanged directly?
Do not assume so. Compare approved application, dimensions, rim, load, clearance, gearing, dual spacing, and fleet or manufacturer guidance.
Why must an RFQ include axle position?
Tread design and casing priorities differ across steer, drive, trailer, and all-position applications.
What makes a commercial quote comparable?
Require the same size, load, position, quantity, route, service scope, freight, installation, warranty, casing terms, and delivery timing from every bidder.