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Cooper Discoverer Rugged Trek LT275/65R20 126/123Q MPN 170057007

What would put the Cooper Discoverer Rugged Trek LT275/65R20 126/123Q MPN 170057007 ahead of the Bridgestone Dueler A/T Ascent LT275/70R18 125/122S MPN 009683 and the Bridgestone Dueler A/T Revo 3 LT255/75R17 111/108R MPN 000018?

Cooper Discoverer Rugged Trek LT275/65R20 126/123Q MPN 170057007 is recorded as an exact MPN row, so shoppers can compare one tire size instead of a broad family label.

The Cooper Discoverer Rugged Trek LT275/65R20 126/123Q MPN 170057007 and the Bridgestone Dueler A/T Ascent LT275/70R18 125/122S MPN 009683 and the Bridgestone Dueler A/T Revo 3 LT255/75R17 111/108R MPN 000018 solve the same wheel & tire clearance need in different ways. This compare holds what each includes, where each stops fitting, and what each asks of the install side by side; price is read after that, on purpose.

Nicole, Fitment Pilot editor

Reviewed by Nicole

Fitment

Ram 2500 current HD diesel trucks when LT275/65R20 126/123Q specs stay inside the checked route limits

Verify first

Use these LT-size rows only when the selected tire diameter, load range, rim width, and service description make sense for the Ram HD route and the wheel offset stays inside the checked positive-offset clearance window.

Part number
170057007
Choose it when
Cooper Discoverer Rugged Trek LT275/65R20 126/123Q MPN 170057007 is recorded as an exact MPN row, so shoppers can compare one tire size instead of a broad family label.
Pass when
Pass when the truck runs into this: Dual-rear-wheel, Power Wagon, or aggressive-offset setups without their own route check
Our cross-product compare

Same category. Different reason to buy.

Evidence level B
Best for
Cooper Discoverer Rugged Trek LT275/65R20 126/123Q MPN 170057007 is an exact SimpleTire row promoted into the truck tire catalog for 2024 Ram 2500 Laramie Crew Cab 4x4 Cummins planning with official tire-family docs a...
Bridgestone Dueler A/T Ascent LT275/70R18 125/122S MPN 009683 is an exact SimpleTire row promoted into the truck tire catalog for 2024 Ram 2500 Laramie Crew Cab 4x4 Cummins planning with official tire-family docs and...
Bridgestone Dueler A/T Revo 3 LT255/75R17 111/108R MPN 000018 is an exact SimpleTire row promoted into the truck tire catalog for 2024 Ram 2500 Laramie Crew Cab 4x4 Cummins planning with official tire-family docs and...
What's included
Tire size: LT275/65R20 126/123Q
Tire size: LT275/70R18 125/122S
Tire size: LT255/75R17 111/108R
Product approach
The 2024 Ram 2500 Laramie Crew Cab 4x4 Cummins 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 LT275/70R18 125/122S MPN 009683.
Documented fitment only -- no standout approach beyond exact application is recorded for the Dueler A/T Revo 3 LT255/75R17 111/108R MPN 000018.
Install burden
Moderate install. Exact tire MPN, tire size, and four-tire price
Confirm the Dueler A/T Ascent LT275/70R18 125/122S MPN 009683 installation procedure and hardware before ordering.
Confirm the Dueler A/T Revo 3 LT255/75R17 111/108R MPN 000018 installation procedure and hardware before ordering.
Fitment
Confirm the exact Cooper Discoverer Rugged Trek LT275/65R20 126/123Q MPN 170057007 application for Ram 2500 current HD diesel trucks before ordering.
Confirm the exact Bridgestone Dueler A/T Ascent LT275/70R18 125/122S MPN 009683 application for Ram 2500 current HD diesel trucks before ordering.
Confirm the exact Bridgestone Dueler A/T Revo 3 LT255/75R17 111/108R MPN 000018 application for Ram 2500 current HD diesel trucks before ordering.
Choose it when
Choose the Discoverer Rugged Trek LT275/65R20 126/123Q MPN 170057007 when it is the exact match for your truck and the Bridgestone Dueler A/T Ascent LT275/70R18 125/122S MPN 009683 and the Bridgestone Dueler A/T Revo 3 LT255/75R17 111/108R MPN 000018 do not list your application.
Choose the Dueler A/T Ascent LT275/70R18 125/122S MPN 009683 when it is the exact match for your truck and the Cooper Discoverer Rugged Trek LT275/65R20 126/123Q MPN 170057007 and the Bridgestone Dueler A/T Revo 3 LT255/75R17 111/108R MPN 000018 do not list your application.
Choose the Dueler A/T Revo 3 LT255/75R17 111/108R MPN 000018 when it is the exact match for your truck and the Cooper Discoverer Rugged Trek LT275/65R20 126/123Q MPN 170057007 and the Bridgestone Dueler A/T Ascent LT275/70R18 125/122S MPN 009683 do not list your application.
Current decision file

Cooper Discoverer Rugged Trek LT275/65R20 126/123Q MPN 170057007

Part ST-170057007

Best for
Cooper Discoverer Rugged Trek LT275/65R20 126/123Q MPN 170057007 is an exact SimpleTire row promoted into the truck tire catalog for 2024 Ram 2500 Laramie Crew Cab 4x4 Cummins planning with official tire-family docs a...
What's included
Tire size: LT275/65R20 126/123Q
Product approach
The 2024 Ram 2500 Laramie Crew Cab 4x4 Cummins 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 Cooper Discoverer Rugged Trek LT275/65R20 126/123Q MPN 170057007 application for Ram 2500 current HD diesel trucks before ordering.
Choose it when
Choose the Discoverer Rugged Trek LT275/65R20 126/123Q MPN 170057007 when it is the exact match for your truck and the Bridgestone Dueler A/T Ascent LT275/70R18 125/122S MPN 009683 and the Bridgestone Dueler A/T Revo 3 LT255/75R17 111/108R MPN 000018 do not list your application.
How we compared

Built from the exact SKU paperwork, the application limits, what comes in the box, the install burden, and where each part can be bought right now. Price is read last, not first.

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 Cooper Discoverer Rugged Trek LT275/65R20 126/123Q MPN 170057007 Part ST-170057007. Cooper resource available.
Fits 2019-current Ram 2500 current HD diesel trucks Use these LT-size rows only when the selected tire diameter, load range, rim width, and service description make sense for the Ram HD route and the wheel offset stays inside the checked positive-offset clearance 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 Cooper Discoverer Rugged Trek LT275/65R20 126/123Q MPN 170057007 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

Cooper Discoverer Rugged Trek LT275/65R20 126/123Q MPN 170057007 is an exact SimpleTire row promoted into the truck tire catalog for 2024 Ram 2500 Laramie Crew Cab 4x4 Cummins planning with official tire-family docs and a current seller price snapshot.

Choose it if

  • Cooper Discoverer Rugged Trek LT275/65R20 126/123Q MPN 170057007 is tracked as an exact MPN row, so shoppers can compare one tire size instead of a broad family label.
  • The 2024 Ram 2500 Laramie Crew Cab 4x4 Cummins 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 LT-size rows only when the selected tire diameter, load range, rim width, and service description make sense for the Ram HD route and the wheel offset stays inside the checked positive-offset clearance window.

Pass if

  • The Cooper Discoverer Rugged Trek LT275/65R20 126/123Q MPN 170057007 is not the right choice when your truck falls outside 2019-current Ram 2500 current HD diesel trucks, or its trim, engine, and package cannot be matched to the documented application.
  • Pass when this exclusion applies: Dual-rear-wheel, Power Wagon, 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 Ram 2500 Laramie Crew Cab 4x4 Cummins route; gas HD trims, dual-rear-wheel trucks, Power Wagon packages, and aggressive lift or trimming plans need their own seller and clearance check.
Workshop & DIY Guidelines

Cooper Discoverer Rugged Trek LT275/65R20 126/123Q MPN 170057007 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

Ram 1500 DT uses a coilover strut with an IFS motion ratio of ~1:1.68. The rear suspension features a 5-link coil setup that maintains ride comfort but requires careful rear spacer height selection to prevent rear spring unseating at full droop when extending rear shocks.

The 2019 model year split Ram 1500 into two distinct architectures: the continuing 4th Gen Ram Classic (DS platform, 5-lug) and the all-new 5th Gen (DT platform, 6-lug). In 2025, Ram refreshed the DT architecture with the 3.0L Hurricane Twin-Turbo inline-six powertrain, updated front fascia, and electric architecture changes, while preserving the 6x139.7 wheel fitment.

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.