# Cooper Discoverer STT Pro Tacoma Review Cooper Discoverer STT Pro scored for Tacoma use: 5.9/10 blended, strongest on mud clearing (10/10), weakest on rolling efficiency (2/10), in 10 Tacoma sizes. ## Canonical URL https://tacotires.com/tires/cooper-discoverer-stt-pro ## The short answer - The Cooper Discoverer STT Pro is a mid-priced mud-terrain that blends to 5.9/10 across the seven all-round axes in our Tacoma tire research set, ranking #49 of 50 overall. - Strongest axes: mud 10/10, durability 10/10. - Weakest axis: efficiency 2/10. - M+S rated; 8th of 9 mud-terrains in the set. - Listed in 10 Tacoma sizes on 16-inch, 17-inch, and 18-inch wheels. - The Cooper Discoverer STT Pro's row rests on 3 cited sources: tacoma owner setups, tacoma category guidance, and manufacturer product. ## How These Scores Are Made Scores here are an editorial synthesis of published manufacturer specifications, tire-industry write-ups, retailer fitment data, and Tacoma-owner reports — Taco Tires runs no instrumented testing of its own. [How we score tires](https://tacotires.com/about#how-we-score). ## Our verdict on the Cooper Discoverer STT Pro Mud clearing is where the Cooper Discoverer STT Pro maxes out at 10/10, and with sidewall and carcass toughness at 10/10 the mud-terrain lands on a 5.9/10 seven-axis blend. That shape is a specialist's: rolling efficiency bottoms out at 2/10 and snow traction sits at 3/10 — an 8-point gap the headline number never sees, since neither axis feeds it, and the dataset flags it when quiet daily driving is the priority. It stops at the M+S marking rather than the 3PMSF symbol; as a mid-priced option it sits at #49 of 50 overall and 8th of 9 mud-terrains, is catalogued in 10 Tacoma sizes on 16- through 18-inch wheels, and rests on 3 cited sources. Its lead use cases are mud and trail work and rock trails, one place behind the Mickey Thompson Baja Boss M/T in our ranking. ## The ten-axis score profile Every model in the research set is rated 0-10 on the same ten axes. For the Cooper Discoverer STT Pro the profile runs from 10/10 on mud down to 2/10 on efficiency; the 5.9/10 headline figure is the average of the seven axes marked below as feeding the blend. | Axis | What it covers | Score | In blend | | --- | --- | --- | --- | | Road comfort | pavement ride quality and noise | 3/10 | Yes | | Wet grip | traction on wet pavement | 5/10 | Yes | | Snow | packed snow and winter road traction | 3/10 | Yes | | Trail | dirt, gravel, and rock trail traction | 9/10 | Yes | | Mud | deep mud traction and self-cleaning | 10/10 | No | | Durability | puncture and sidewall resistance | 10/10 | Yes | | Tread life | expected mileage before replacement | 5/10 | Yes | | Efficiency | weight and rolling resistance | 2/10 | No | | Looks | how aggressive the tread and sidewall read | 9/10 | No | | Value | what the tire delivers per dollar | 6/10 | Yes | 7 of the ten axes feed the blended number (road comfort, wet grip, snow, trail, durability, tread life, and value); mud, efficiency, and looks are shown for the Cooper Discoverer STT Pro but sit outside it, which is why a mud or looks score can run well above or below the headline. ## Who the Cooper Discoverer STT Pro is for ### Best for The research dataset tags the Cooper Discoverer STT Pro for the uses below; the number after each one is the axis in its own profile that backs the tag. - Mud and trail work — mud 10/10. - Rock trails — durability 10/10. - Sidewall durability — durability 10/10. - Buyers set on Cooper. ### Avoid if The same dataset flags where the Cooper Discoverer STT Pro is the wrong pick, again with the axis behind each call. - Quiet daily driving is the priority — road comfort 3/10. - A 3PMSF severe-snow rating is required — snow 3/10. - Fuel economy is the priority — efficiency 2/10. ## Tacoma sizes the Cooper Discoverer STT Pro comes in The catalog behind this dataset records the Cooper Discoverer STT Pro in 10 sizes that fit common Tacoma wheel diameters, spanning 16-inch, 17-inch, and 18-inch wheels. Of those, 9 have a Tacoma fitment page on this site, linked below. - [265/75R16](https://tacotires.com/tacoma/tire-size/265-75r16) — 16-inch wheel - [285/75R16](https://tacotires.com/tacoma/tire-size/285-75r16) — 16-inch wheel - [285/70R17](https://tacotires.com/tacoma/tire-size/285-70r17) — 17-inch wheel - [33x12.5R17](https://tacotires.com/tacoma/tire-size/33x12-5r17) — 17-inch wheel - [255/80R17](https://tacotires.com/tacoma/tire-size/255-80r17) — 17-inch wheel - [285/75R17](https://tacotires.com/tacoma/tire-size/285-75r17) — 17-inch wheel - 315/70R17 — 17-inch wheel, no fitment page on this site yet - [35x12.5R17](https://tacotires.com/tacoma/tire-size/35x12-5r17) — 17-inch wheel - [275/70R18](https://tacotires.com/tacoma/tire-size/275-70r18) — 18-inch wheel - [285/70R18](https://tacotires.com/tacoma/tire-size/285-70r18) — 18-inch wheel Those 10 entries are the dataset's own availability list for the Cooper Discoverer STT Pro, not a live retailer feed — a model with a thin catalog gets a short list here rather than a padded one. What actually clears on your truck still depends on wheel width, offset, and how much trimming you will accept, so check the size against your generation before you buy. ## Sources behind the Cooper Discoverer STT Pro's scores The Cooper Discoverer STT Pro's row rests on 3 of the 83 cited documents behind this research set — tacoma owner setups, tacoma category guidance, and manufacturer product. Each is listed with the date it was read. - [Trailtacoma MT Options](https://trailtacoma.com/3rd-gen/taco-tuesday-7-mud-terrain-tire-setups/) — trailtacoma.com, tacoma owner setups, read 2026-07-03. TrailTacoma's mud-terrain setup roundup includes Falken Wildpeak M/T01, BFGoodrich KM3, Nitto Mud Grappler, Yokohama Geolandar M/T G003, Toyo Open Country M/T, Nitto Trail Grappler, Nitto Ridge Grappler, and Mickey Thompson Baja Boss M/T. - [Trailtacoma AT Vs MT](https://trailtacoma.com/2024-tacoma/all-terrain-vs-mud-terrain-tires-what-you-should-know/) — trailtacoma.com, tacoma category guidance, read 2026-07-03. TrailTacoma explains the tradeoffs among H/T, A/T, R/T, and M/T tires for Tacoma owners and flags BFG, Cooper, Nitto, and Yokohama as common big-name choices. - [Cooper Stt Pro](https://www.coopertire.com/en_US/tires/discoverer-stt-pro/24494.html) — coopertire.com, manufacturer product, read 2026-07-03. Cooper product page for Discoverer STT Pro, positioned as an extreme off-road tire with Stone Armor technology. ## FAQ ### Is the Cooper Discoverer STT Pro a good tire for a Toyota Tacoma? In our editorial synthesis the Cooper Discoverer STT Pro blends to 5.9/10 across the seven all-round axes, which places it 8th of 9 mud-terrains and #49 of 50 in the whole research set. Its case rests on mud clearing (10/10) and sidewall and carcass toughness (10/10), so it suits mud and trail work, rock trails, and sidewall durability. ### What Tacoma tire sizes does the Cooper Discoverer STT Pro come in? The research catalog records the Cooper Discoverer STT Pro as offered in 10 sizes that fit common Tacoma wheel diameters: 265/75R16, 285/75R16, 285/70R17, 33x12.5R17, 255/80R17, 285/75R17, 315/70R17, 35x12.5R17, 275/70R18, and 285/70R18. That is the dataset's own availability list rather than a live retailer feed, so confirm the exact size and load range with the seller before ordering. ### Is the Cooper Discoverer STT Pro rated for snow? The Cooper Discoverer STT Pro carries the M+S marking but not the 3PMSF severe-snow symbol, and our synthesis scores its snow axis at 3/10. If your state or your commute requires a severe-snow-rated tire, this is not the row to pick. ### What are the downsides of the Cooper Discoverer STT Pro? The weakest marks in the Cooper Discoverer STT Pro's profile are rolling efficiency at 2/10 and snow traction at 3/10. The dataset flags it as the wrong choice when quiet daily driving is the priority and a 3PMSF severe-snow rating is required. Those judgements come from the 3 cited sources listed on this page, not from anything measured here. ## Related - [Best mud-terrains for the Tacoma](https://tacotires.com/guides/best-mud-terrain-tires-for-tacoma) - [All-terrain vs mud-terrain on a Tacoma](https://tacotires.com/guides/all-terrain-vs-mud-terrain-tires-tacoma) - [All Tacoma tire reviews](https://tacotires.com/tires) - [Match a tire to my build](https://tacotires.com/find-my-tire-size) - [Every Tacoma tire size](https://tacotires.com/tacoma/tire-size) - [Compare two sizes](https://tacotires.com/tire-calculator)