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TL;DR
- The Baja Boss A/T is Mickey Thompson's premium hybrid all-terrain: 59 sizes on 15-24in wheels, 60,000 warranted miles on SUV sizes and 50,000 on LT sizes.
- Its 3PMS severe-snow rating covers only sizes 12.50in (315mm) wide or narrower. By that rule, 9 of the 59 listed sizes (the 13.50in and 15.50in flotation sizes and LT325/50R22) are not severe-snow rated.
- The Baja Legend EXP is LT-only: 41 sizes, 18.5/32in of tread on every one, every size Q speed-rated (99 mph), a 50,000-mile warranty and no snow claim.
- The Baja MTZ P3 mud-terrain is discontinued; the current mud-terrains are the Baja Boss M/T and Baja Legend MTZ.
- Mickey Thompson's warranty excludes off-road, racing and commercial use, damage from suspension modifications and stud pin holes, and it offers no road-hazard coverage.
Mickey Thompson Tires dates itself to 1963 and calls itself an enthusiast brand. Its founder was a racer: the company credits him as the first to reach 406 mph, in 1960, and its Challenger 2 set a 406.7 mph record at Bonneville Speed Week in 2016. Its list of firsts includes wide, low-profile tires at the 1963 Indy 500, raised white letters in 1970 and, in 1998, a directional 4x4 tire with Sidebiter sidewall lugs (the Baja Claw). Cooper Tire bought the company in 2003, and Goodyear completed its acquisition of Cooper on June 7, 2021.
At a Glance
| Tire | Made for | Sizes and load | 3PMS snow rating | Mileage warranty |
|---|---|---|---|---|
| Baja Boss A/T | Trucks and SUVs wanting aggressive looks with all-terrain manners | 59 sizes: 15 SUV (SL/XL), 44 LT and flotation (D-F) | Widths up to 12.50in (315mm) only | 60,000 mi SUV; 50,000 mi LT |
| Baja Legend EXP | Trail use and daily driving | 41 LT and flotation sizes, C-F | No claim | 50,000 mi |
| Baja MTZ P3 | Discontinued mud-terrain | No current size table | No | None |
Baja Boss A/T
Mickey Thompson launched the Baja Boss A/T on April 30, 2021, for 17-24in wheels, and added more sizes that November. It calls the tire its most innovative hybrid all-terrain to date. The design has four parts:
- an asymmetric tread pattern for noise, off-road traction and on-road handling;
- a silica-reinforced compound, T1 on LT sizes and S1 on SUV sizes;
- Extreme Sidebiters on LT sizes;
- PowerPly XD 3-ply construction on LT sizes, which the 2026 Light Truck Tire Guide describes as adding "50% heavier denier cord" to the third ply.
Mickey Thompson says the extra cord improves puncture resistance, steering response and stability. The Sidebiter depth claim is stated three different ways. The product page calls them 150% deeper than the Baja ATZ P3's. The guide's text says 150% deeper than the Baja Legend EXP's. The guide's comparison table says 150% deeper than standard Sidebiters. All three agree on 150%, but not on what it is measured against.
The size chart splits in two. The 15 SUV sizes (five SL, ten XL) have 16/32in of tread and are all T speed-rated (118 mph). The 44 LT-metric and flotation sizes have 18.5/32in and are all Q-rated (99 mph); 27 are Load Range E, 13 are F and four are D. The snow rating follows width: Mickey Thompson certifies "all sizes 12.50 (315) and narrower." Eight flotation sizes from 33x13.50R20LT to 37x13.50R24LT, plus LT325/50R22, fall outside that rule.
Baja Legend EXP
The Legend EXP is a hybrid all-terrain for trail and daily driving, built only in LT-metric (31) and flotation (10) sizes on 15-20in wheels. Mickey Thompson lists:
- a T4 silica-reinforced compound for wet handling and braking, cut and chip resistance and tread life;
- next-generation lightweight high-tensile body plies for ride and durability;
- standard Sidebiters.
Every size has 18.5/32in of tread and a Q speed rating. Load Range E covers 31 sizes; four are D, three are C and three are F. The three Load Range C sizes are all 15-inch flotation tires: 31x10.50R15LT (109), 33x12.50R15LT (108) and 35x12.50R15LT (113). Neither the product page nor the 2026 guide makes a severe-snow claim for the Legend EXP.
Load and Speed Worked Examples
The Boss A/T is offered in both constructions in 265/70R17, which makes the difference easy to see. The SUV version is an XL at 116 T, which Goodyear's load-index chart converts to 2,756 lb per tire. The LT version is Load Range E at 121 Q (3,197 lb), 441 lb more, but with a 99 mph speed limit instead of 118. On a pickup or SUV, FMVSS 120 also divides a passenger tire's rating by 1.10, which leaves the XL at about 2,505 lb. The gap per tire is then 692 lb, or 1,384 lb across an axle.
Flotation sizes vary even within a load range. On the Boss A/T, 35x12.50R17LT is a Load Range D at 119 (2,998 lb), while 35x12.50R20LT is an F at 125 (3,638 lb). The Load Range F 35x15.50R24LT is rated only 117 (2,833 lb). Mickey Thompson's warranty requires tires with a load index at least equal to the vehicle maker's specification. Its treadwear coverage also requires the size, load index and speed rating to be equal to or greater than the original specification, so check the placard before downsizing the load index.
Baja MTZ P3 (Discontinued)
The Baja MTZ P3 mud-terrain is discontinued. Its product page no longer resolves, and it is missing from the 2026 Light Truck Tire Guide. The guide's current mud-terrains are the Baja Boss M/T and Baja Legend MTZ, though Mickey Thompson doesn't name either as a direct replacement.
Mickey Thompson Warranty Terms
Mickey Thompson's passenger and light-truck limited warranty covers the original purchaser on the original vehicle.
- First 2/32in of wear: a tire with an eligible condition is replaced free. Balance, out-of-round and ride complaints are covered only in this period.
- After 2/32in: replacement is prorated at the dealer's current price times the percentage of original tread worn.
- End of coverage: tread at 2/32in, or 72 months from purchase, whichever comes first.
The exclusions are unusually relevant to 4x4 owners. Mickey Thompson excludes:
- "tires used in any commercial, racing, or off-road applications";
- conditions resulting from suspension modifications;
- over-deflection;
- tires altered by extra siping, buffing or stud pin holes;
- ozone cracking more than four years after manufacture or purchase.
There is no road-hazard coverage; the company points buyers to dealer plans.
The mileage warranty is separate and prorated from the first mile: there is no free-replacement period. It applies in the 48 contiguous states, DC and Canada, and only if the tires are rotated at least every 6,000 miles with the rotation recorded. The adjustment is based on miles delivered against miles warranted. A Boss A/T LT tire that wears out at 30,000 of its 50,000 miles has delivered 60% of its warranted life. Mickey Thompson recommends replacing any tire, spare included, 10 years after its date of manufacture.
Mickey Thompson’s Lineup in This Library
3 Mickey Thompson models (All-Terrain, Mud-Terrain). Specs come from Mickey Thompson’s own spec pages; we don’t buy or test tires — see how we rank.
BFGoodrich, Goodyear, Michelin, Bridgestone, Falken, Toyo, Cooper, Nitto, Mickey Thompson, Yokohama, Hankook, General Tire and all other tire brand names referenced on this site are trademarks of their respective owners. 4x4 & Overlanding is an independent publication and is not affiliated with, sponsored or endorsed by any tire manufacturer.
Sources
- Mickey Thompson — About M/T (brand history) — The 1963 founding, the 1960 406 mph and 2016 406.7 mph records, the brand's firsts (1963 Indy wide/low tires, 1970 raised white letters, 1998 Baja Claw Sidebiters) and Cooper's 2003 acquisition.
- Goodyear — Goodyear Completes Acquisition of Cooper (June 7, 2021) — Cooper, Mickey Thompson's parent, joining Goodyear on June 7, 2021.
- Mickey Thompson — Baja Boss A/T product page — Baja Boss A/T features, the 150%-deeper Sidebiter claim against the Baja ATZ P3, T1/S1 compounds, the 50,000/60,000-mile warranty, and 3PMS on sizes 12.50 (315) and narrower.
- Mickey Thompson — Baja Boss A/T launch news release (April 30, 2021) — The April 30, 2021 launch for 17-24in wheels and the additional sizes that November.
- Mickey Thompson — 2026 Light Truck Tire Guide (PDF) — PowerPly XD's 50% heavier denier third-ply cord, the Sidebiter comparison table, Baja Legend EXP features, the current mud-terrain line-up, and the prorated tread-wear warranty terms (6,000-mile rotation, 48 states, DC and Canada).
- Mickey Thompson — Baja Legend EXP product page (size tables) — Legend EXP sizes, load indexes, load ranges, Q speed ratings and 18.5/32in tread.
- Mickey Thompson — Passenger and Light Truck Limited Warranty (PDF) — Free replacement in the first 2/32in, prorated replacement after, the 72-month limit, exclusions for off-road, racing and commercial use, suspension modifications and stud pin holes, no road-hazard coverage, and the 10-year replacement advice.
- Goodyear — Load Index and Speed Rating — Load-index conversions to pounds up to index 120, and the speed-symbol chart (Q 99 mph through V 149 mph).
- Goodyear Canada — Tire Load Index chart — Load-index conversions above 120 (121 = 3,197 lb through 129 = 4,079 lb) used in the worked examples.
- 49 CFR 571.120 (FMVSS 120), S5.1.2 — Tire selection for vehicles other than passenger cars (LII / Cornell) — Axle tire load ratings must cover the GAWR, and a passenger-car tire's rating is divided by 1.10 on trucks and multipurpose passenger vehicles.