Firestone FT492

A free-rolling trailer tire for the long lanes. Firestone builds the FT492 for single- and tandem-axle trailers and for dollies in long-haul and regional-haul highway service, which in practice is truckload and LTL work where the trailer runs loaded, runs straight, and the eight positions behind the tractor are pure fuel burn. That is the job it is designed around. It is EPA SmartWay verified and CARB compliant, so it clears fleets that have to document low rolling resistance.

The fuel economy comes from compound and geometry, not from shorting the tread alone. Firestone’s patented NanoPro-Tech polymer limits energy loss in the compound. The high rigidity tread pattern controls movement of the ribs and blocks during rotation, which Firestone credits for long, even wear and reduced rolling resistance. The Defense Groove structure creates uniform shoulder pressure to fight shoulder edge wear. Cross-rib sipes slice through water for grip on wet pavement; the stress-relief sipes do a different job, absorbing rib-edge stress in the footprint to fight irregular wear along the main ribs. Durability and retreadability come from the optimized belt package, which also takes weight out alongside the IntelliShape sidewall: the 295/75R22.5 weighs 94 lb. Protector ribs take the curb hits. Tread depth is 11/32 in every size we quote.

It is a trailer tire and nothing else. Firestone publishes no steer, drive or all-position rating for the FT492, so it does not belong on a front axle or under power. It carries no Three-Peak Mountain Snowflake marking, so it must not be sold as severe-snow rated; the Firestone pattern that meets the 3PMSF criteria is the FD692 drive tire, not this one. Shallow 11/32 tread is a deliberate trade, and it is the wrong trade for abrasive surfaces, yards, job sites or anything off the pavement. Firestone puts that in writing: severe service, mining and logging are excluded, and the casing warranty assumes long-haul, regional or pickup-and-delivery highway service for the entire life of the casing. Every size we quote is load range G, 14 ply, speed symbol L, 75 mph: 11R22.5 at 144/142 L, 11R24.5 at 146/143 L, 285/75R24.5 and 295/75R22.5 at 144/141 L. There is no load range H FT492 in any of those four; the only H build Firestone makes is 255/70R22.5, which is not a size we quote. And Firestone states plainly that no mileage warranty is expressed or implied, so nobody here will hand you a miles-to-removal number.

The factory-direct alternative in this position is the Invovic FM591, a deep-tread free-rolling rib design that does the same trailer-axle job on our own import program, molded in Cambodia, in 11R22.5, 11R24.5 and 295/75R22.5, in 16-ply Load Range H where the FT492 is 14-ply Load Range G. It runs 19/32 to 20/32 against the FT492’s 11/32, which is the whole trade: removal miles instead of rolling resistance. The rest of the difference is documentary. The FT492 is EPA SmartWay verified and CARB compliant; it carries Firestone’s base limited warranty, six years from date of manufacture down to 2/32; it is eligible for the Enhanced Casing Credit Limited Warranty, which pays on the casing only when the tire has been inspected and retreaded by an authorized Bandag dealer, and only in long-haul, regional or pickup-and-delivery highway service; it has a named matched retread in Bandag B123 FuelTech; Firestone publishes a tire weight for every size; and it is built in all four of the sizes we quote. The FM591 carries no SmartWay listing, no published casing-credit schedule and no named retread pattern, Invovic publishes no tire weight, and it is not made in 285/75R24.5. If a fleet spec or a shipper’s compliance file names a SmartWay-verified trailer tire, spec the FT492. Otherwise put both on one quote and compare the two all-in numbers, delivered — those numbers come back from us, per order.