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Firestone Transforce AT2 LT275/65R20 126/123R MPN 000191

What would put the Firestone Transforce AT2 LT275/65R20 126/123R MPN 000191 ahead of the Bridgestone Dueler A/T Ascent 265/60R18 110T MPN 009706 and the Cooper Discoverer Rugged Trek 265/65R18 116T MPN 171066005?

Firestone Transforce AT2 LT275/65R20 126/123R MPN 000191 is recorded as an exact MPN row, so shoppers can compare one tire size instead of a broad family label.

The Firestone Transforce AT2 LT275/65R20 126/123R MPN 000191 is on this shortlist for a specific truck and use, not because it beats the Bridgestone Dueler A/T Ascent 265/60R18 110T MPN 009706 and the Cooper Discoverer Rugged Trek 265/65R18 116T MPN 171066005 on every line. The rows below keep included hardware, the fitment, and install effort in view before any seller price, so the trade stays yours to make.

Nicole, Fitment Pilot editor

Reviewed by Nicole

Fitment

Toyota Tundra current full-size trucks when LT275/65R20 126/123R specs stay inside the checked route limits

Verify first

Use these full-size tire rows when the Tundra tire diameter, load rating, rim width, and service description match the route limits and the wheel offset stays inside the checked positive-offset window.

Part number
000191
Choose it when
Firestone Transforce AT2 LT275/65R20 126/123R MPN 000191 is recorded as an exact MPN row, so shoppers can compare one tire size instead of a broad family label.
Pass when
Choose one of the others when this applies: TRD Pro, dealer-lift, hybrid, or aggressive-offset setups without their own route check
Our cross-product compare

Same category. Different reason to buy.

Evidence level B
Best for
Firestone Transforce AT2 LT275/65R20 126/123R MPN 000191 is an exact SimpleTire row promoted into the truck tire catalog for 2024 Toyota Tundra SR5 CrewMax 4x4 planning with official tire-family docs and a current sel...
Bridgestone Dueler A/T Ascent 265/60R18 110T MPN 009706 is an exact SimpleTire row promoted into the truck tire catalog for 2024 Toyota Tundra SR5 CrewMax 4x4 planning with official tire-family docs and a current sell...
Cooper Discoverer Rugged Trek 265/65R18 116T MPN 171066005 is an exact SimpleTire row promoted into the truck tire catalog for 2024 Toyota Tundra SR5 CrewMax 4x4 planning with official tire-family docs and a current s...
What's included
Tire size: LT275/65R20 126/123R
Tire size: 265/60R18 110T
Tire size: 265/65R18 116T
Product approach
The 2024 Toyota Tundra SR5 CrewMax 4x4 route keeps offset, diameter, load, and rim-width checks visible before the offer is treated as a match.
Documented fitment only -- no standout approach beyond exact application is recorded for the Dueler A/T Ascent 265/60R18 110T MPN 009706.
Documented fitment only -- no standout approach beyond exact application is recorded for the Discoverer Rugged Trek 265/65R18 116T MPN 171066005.
Install burden
Moderate install. Exact tire MPN, tire size, and four-tire price
Confirm the Dueler A/T Ascent 265/60R18 110T MPN 009706 installation procedure and hardware before ordering.
Confirm the Discoverer Rugged Trek 265/65R18 116T MPN 171066005 installation procedure and hardware before ordering.
Fitment
Confirm the exact Firestone Transforce AT2 LT275/65R20 126/123R MPN 000191 application for Toyota Tundra current full-size trucks before ordering.
Confirm the exact Bridgestone Dueler A/T Ascent 265/60R18 110T MPN 009706 application for Toyota Tundra current full-size trucks before ordering.
Confirm the exact Cooper Discoverer Rugged Trek 265/65R18 116T MPN 171066005 application for Toyota Tundra current full-size trucks before ordering.
Choose it when
Choose the Transforce AT2 LT275/65R20 126/123R MPN 000191 when it is the exact match for your truck and the Bridgestone Dueler A/T Ascent 265/60R18 110T MPN 009706 and the Cooper Discoverer Rugged Trek 265/65R18 116T MPN 171066005 do not list your application.
Pick the Dueler A/T Ascent 265/60R18 110T MPN 009706 over the Firestone Transforce AT2 LT275/65R20 126/123R MPN 000191 and the Cooper Discoverer Rugged Trek 265/65R18 116T MPN 171066005 when you want a balanced on- and off-road all-terrain tire.
Choose the Discoverer Rugged Trek 265/65R18 116T MPN 171066005 when it is the exact match for your truck and the Firestone Transforce AT2 LT275/65R20 126/123R MPN 000191 and the Bridgestone Dueler A/T Ascent 265/60R18 110T MPN 009706 do not list your application.
Current decision file

Firestone Transforce AT2 LT275/65R20 126/123R MPN 000191

Part ST-000191

Best for
Firestone Transforce AT2 LT275/65R20 126/123R MPN 000191 is an exact SimpleTire row promoted into the truck tire catalog for 2024 Toyota Tundra SR5 CrewMax 4x4 planning with official tire-family docs and a current sel...
What's included
Tire size: LT275/65R20 126/123R
Product approach
The 2024 Toyota Tundra SR5 CrewMax 4x4 route keeps offset, diameter, load, and rim-width checks visible before the offer is treated as a match.
Install burden
Moderate install. Exact tire MPN, tire size, and four-tire price
Fitment
Confirm the exact Firestone Transforce AT2 LT275/65R20 126/123R MPN 000191 application for Toyota Tundra current full-size trucks before ordering.
Choose it when
Choose the Transforce AT2 LT275/65R20 126/123R MPN 000191 when it is the exact match for your truck and the Bridgestone Dueler A/T Ascent 265/60R18 110T MPN 009706 and the Cooper Discoverer Rugged Trek 265/65R18 116T MPN 171066005 do not list your application.
How we compared

These line up on documented fitment, package contents, install effort, and live seller access -- not on marketing copy or star counts. Where the evidence runs out, the row says so.

Wheel & tire owned fitment checklist visual
Visual unavailable
Illustration
Where to buy it

Price references

No paid offer is live here. Treat any price shown as a reference only, and use the other retailer searches below to check current availability.

No current price reference

Use the retailer searches below and confirm the exact manufacturer part number before ordering.

Other retailers to check

These other-retailer searches use the brand and part number shown on this page. We earn nothing if you buy through them.

Other retailer

SimpleTire

An online tire seller sorted by brand and size, useful for lining up the exact size, load range, and quantity.

Browse by tire brand, then confirm the exact size, load range, quantity, and service description.

Browse tire brands
Other retailer

Summit Racing

House fitment data and manufacturer spec sheets ride along on their pages, which makes it a good spot to sanity-check the part number.

Search with the brand and part number shown on this page, then confirm the manufacturer part number before ordering.

Search Summit Racing
Other retailer

Walmart

A broad marketplace where third-party sellers vary widely, so check who is actually selling and how returns work.

Search with the brand and part number shown on this page, then verify the exact seller, item condition, fitment, and return terms.

Search Walmart

Price checks build up as sellers are rechecked over time. The seller's checkout page has the final say; make sure stock, exact SKU, and seller details all agree before you order.

Report an issue
Decision trail Check these before you buy.
Part Firestone Transforce AT2 LT275/65R20 126/123R MPN 000191 Part ST-000191. Firestone resource available.
Fits 2022-current Toyota Tundra current full-size trucks Use these full-size tire rows when the Tundra tire diameter, load rating, rim width, and service description match the route limits and the wheel offset stays inside the checked positive-offset window.
Watch for Wheel & Tire Clearance checkout checks Confirm load rating, wheel offset, tire diameter, rubbing risk, TPMS needs, and spare-tire planning before checkout.
Other retailer · Seller 3 other retailer searches Search with the brand and part number shown here, then confirm the exact part and fitment with the retailer.
Photos Category visual The photo shows the category, not this exact part; an exact product photo appears once image rights are confirmed.
If unsure Compare, read, or report If the seller page, vehicle details, or photos do not line up, compare sellers, read the guide, or report the issue.
The evidence

Fitment and install resources

Reviewed 2026-09-21

Editorial method

What we checked on this page

We check the Firestone Transforce AT2 LT275/65R20 126/123R MPN 000191 for exact part identity, seller options, stock and price dates, photo rights, and official resources. FitmentPilot combines automated vehicle database indexing with human automotive editorial review. Rather than presenting generic affiliate catalogs, our system evaluates the exact mechanical constraints of each chassis platform — from bolt circle geometry and motion ratios to factory package exclusions — giving truck owners complete confidence before checkout.

Sellers3 seller destinations

Paid offers and other retailer searches are labeled separately so you can choose where to check.

FreshnessConfirm stock at the retailer

Check current stock and price with the retailer before ordering.

PhotosCategory visual only

This photo shows the part category, not this exact product. Confirm SKU, size, and kit contents before ordering.

Resources2 official resources

Install, fitment, spec, or warranty resources are available before checkout.

An exact product photo appears here once image rights are confirmed.

Choose it, pass, or verify

Firestone Transforce AT2 LT275/65R20 126/123R MPN 000191 is an exact SimpleTire row promoted into the truck tire catalog for 2024 Toyota Tundra SR5 CrewMax 4x4 planning with official tire-family docs and a current seller price snapshot.

Choose it if

  • Firestone Transforce AT2 LT275/65R20 126/123R MPN 000191 is tracked as an exact MPN row, so shoppers can compare one tire size instead of a broad family label.
  • The 2024 Toyota Tundra SR5 CrewMax 4x4 route keeps offset, diameter, load, and rim-width checks visible before the offer is treated as a match.
  • Seller price, rating context, warranty resources, exact tire specs, and fitment checks are present, but final stock and shipping terms still belong in checkout.
  • Use these full-size tire rows when the Tundra tire diameter, load rating, rim width, and service description match the route limits and the wheel offset stays inside the checked positive-offset window.

Pass if

  • The Firestone Transforce AT2 LT275/65R20 126/123R MPN 000191 is not the right choice when your truck falls outside 2022-current Toyota Tundra current full-size trucks, or its trim, engine, and package cannot be matched to the documented application.
  • Pass when this exclusion applies: TRD Pro, dealer-lift, hybrid, or aggressive-offset setups without their own route check
  • Choose another size or construction when load capacity, wheel width, offset, rubbing clearance, ride, or spare-tire needs point elsewhere.

Verify

  • Exact tire MPN, tire size, and four-tire price
  • Load range, service description, rim width, and tire diameter
  • Wheel offset, brake clearance, seller stock, shipping, returns, and installer requirements
  • The checked shelf is a 2024 Tundra SR5 CrewMax 4x4 route; TRD Pro, hybrid, dealer-lift, and aftermarket suspension packages need their own clearance and seller checks before inheriting this answer.
Workshop & DIY Guidelines

Firestone Transforce AT2 LT275/65R20 126/123R MPN 000191 Installation & Fitment Protocol

Wheel fitment is governed by three interrelated geometric factors: bolt circle diameter, wheel offset (ET in millimeters), and backspacing (inches from the back lip to the mounting surface). Lower or negative offset wheels push the tire outward for an aggressive stance, which increases the scrub radius and swings the outer shoulder into bumper valances and cab mounts during steering.

Install Difficulty

Shop & Bench Specs

Difficulty: Beginner (1/5)

Estimated Install Time: 1.0 – 1.5 hours (Wheel Mounting & TPMS Pairing)

Required Tools

Installation Equipment

  • Floor jack & jack stands
  • 1/2" Drive calibrated torque wrench
  • Thin-wall protective lug nut socket set (prevent wheel finish damage)
  • Tire pressure gauge
Post-Install Safety

Post-Install Protocol

  • Torque lug nuts in a criss-cross star pattern to manufacturer spec in two stages (first 50%, then 100%).
  • Perform mandatory re-torque check after 50 to 100 driving miles.
  • Verify full steering lock-to-lock clearance at ride height and during full suspension compression.

Wear Triggers & Maintenance Checks

  • Wheel bearing stress and premature hub assembly wear when running extreme negative offset (-12mm to -44mm).
  • Cupping or feathering wear on oversized tires when run at incorrect cold inflation pressures.
  • Caliper bracket scoring if wheel inner barrel clearance is under 3mm.

Chassis Fitment Context

3rd Gen Tundra (2022+) features an IFS motion ratio of ~1:1.75. Due to redesigned cast aluminum front steering knuckles, clearance between tire sidewalls and the upper ball joint neck is tighter than on prior generations, necessitating wheel offsets between +18mm and +25mm for 35x12.50 tires.

The 2nd Gen XK50 (2007-2021) was famed for its 5.7L naturally aspirated V8, 5x150 bolt pattern, and rear leaf springs. In 2022, the 3rd Gen transitioned to the TNGA-F platform with the 3.4L Twin-Turbo V6 / Hybrid, multi-link rear coil suspension, and switched to the universal 6x139.7 mm bolt circle.

Pre-Installation Unboxing Verification Checklist

Step 01: Confirm Physical SKU & Labeling

Inspect outer box label against your order invoice and the manufacturer part number shown here before opening hardware bags.

Step 02: Dry-Fit & Hardware Inventory

Unpack fasteners, brackets, and instructions. Perform a preliminary dry-fit check against the vehicle before removing factory components.

Step 03: Review Torque & Thread Requirements

Identify critical torque values and whether thread locker (Blue Loctite) or anti-seize compound is required by the manufacturer.

Step 04: Plan Post-Install Calibration

For suspension, steering, or lighting parts, schedule a professional alignment and verify forward-facing ADAS sensor calibration.