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Toyo Open Country A/T III LT305/70R16 124/121R MPN 355570

Is the Toyo Open Country A/T III LT305/70R16 124/121R MPN 355570 the wheel & tire clearance pick here, or just one of three?

Toyo Open Country A/T III LT305/70R16 124/121R MPN 355570 is recorded as an exact MPN row, so shoppers can compare one tire size instead of a broad family label.

The Toyo Open Country A/T III LT305/70R16 124/121R MPN 355570 and the Cooper Discoverer Rugged Trek LT275/65R18 123/120Q MPN 170058007 and the Cooper Discoverer Rugged Trek LT285/75R18 129/126Q MPN 170274046 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

Ford F-250 current Super Duty diesel trucks when LT305/70R16 124/121R specs stay inside the checked route limits

Verify first

Use these tire rows for Super Duty planning only when the exact LT size, load range, service description, rim width, and positive-offset wheel setup remain inside the checked route limits.

Part number
355570
Choose it when
Toyo Open Country A/T III LT305/70R16 124/121R MPN 355570 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: Tremor, dual-rear-wheel, commercial upfit, or lifted trucks without their own route check
Our cross-product compare

Same category. Different reason to buy.

Evidence level B
Best for
Toyo Open Country A/T III LT305/70R16 124/121R MPN 355570 is an exact SimpleTire row promoted into the truck tire catalog for 2024 Ford F-250 XLT Crew Cab 4x4 Power Stroke planning with official tire-family docs and a...
Cooper Discoverer Rugged Trek LT275/65R18 123/120Q MPN 170058007 is an exact SimpleTire row promoted into the truck tire catalog for 2024 Ford F-250 XLT Crew Cab 4x4 Power Stroke planning with official tire-family doc...
Cooper Discoverer Rugged Trek LT285/75R18 129/126Q MPN 170274046 is an exact SimpleTire row promoted into the truck tire catalog for 2024 Ford F-250 XLT Crew Cab 4x4 Power Stroke planning with official tire-family doc...
What's included
Tire size: LT305/70R16 124/121R
Tire size: LT275/65R18 123/120Q
Tire size: LT285/75R18 129/126Q
Product approach
The 2024 Ford F-250 XLT Crew Cab 4x4 Power Stroke 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 Discoverer Rugged Trek LT275/65R18 123/120Q MPN 170058007.
Documented fitment only -- no standout approach beyond exact application is recorded for the Discoverer Rugged Trek LT285/75R18 129/126Q MPN 170274046.
Install burden
Moderate install. Exact tire MPN, tire size, and four-tire price
Confirm the Discoverer Rugged Trek LT275/65R18 123/120Q MPN 170058007 installation procedure and hardware before ordering.
Confirm the Discoverer Rugged Trek LT285/75R18 129/126Q MPN 170274046 installation procedure and hardware before ordering.
Fitment
Confirm the exact Toyo Open Country A/T III LT305/70R16 124/121R MPN 355570 application for Ford F-250 current Super Duty diesel trucks before ordering.
Confirm the exact Cooper Discoverer Rugged Trek LT275/65R18 123/120Q MPN 170058007 application for Ford F-250 current Super Duty diesel trucks before ordering.
Confirm the exact Cooper Discoverer Rugged Trek LT285/75R18 129/126Q MPN 170274046 application for Ford F-250 current Super Duty diesel trucks before ordering.
Choose it when
Pick the Open Country A/T III LT305/70R16 124/121R MPN 355570 over the Cooper Discoverer Rugged Trek LT275/65R18 123/120Q MPN 170058007 and the Cooper Discoverer Rugged Trek LT285/75R18 129/126Q MPN 170274046 when you want a balanced on- and off-road all-terrain tire.
Choose the Discoverer Rugged Trek LT275/65R18 123/120Q MPN 170058007 when it is the exact match for your truck and the Toyo Open Country A/T III LT305/70R16 124/121R MPN 355570 and the Cooper Discoverer Rugged Trek LT285/75R18 129/126Q MPN 170274046 do not list your application.
Choose the Discoverer Rugged Trek LT285/75R18 129/126Q MPN 170274046 when it is the exact match for your truck and the Toyo Open Country A/T III LT305/70R16 124/121R MPN 355570 and the Cooper Discoverer Rugged Trek LT275/65R18 123/120Q MPN 170058007 do not list your application.
Current decision file

Toyo Open Country A/T III LT305/70R16 124/121R MPN 355570

Part ST-355570

Best for
Toyo Open Country A/T III LT305/70R16 124/121R MPN 355570 is an exact SimpleTire row promoted into the truck tire catalog for 2024 Ford F-250 XLT Crew Cab 4x4 Power Stroke planning with official tire-family docs and a...
What's included
Tire size: LT305/70R16 124/121R
Product approach
The 2024 Ford F-250 XLT Crew Cab 4x4 Power Stroke 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 Toyo Open Country A/T III LT305/70R16 124/121R MPN 355570 application for Ford F-250 current Super Duty diesel trucks before ordering.
Choose it when
Pick the Open Country A/T III LT305/70R16 124/121R MPN 355570 over the Cooper Discoverer Rugged Trek LT275/65R18 123/120Q MPN 170058007 and the Cooper Discoverer Rugged Trek LT285/75R18 129/126Q MPN 170274046 when you want a balanced on- and off-road all-terrain tire.
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 Toyo Open Country A/T III LT305/70R16 124/121R MPN 355570 Part ST-355570. Toyo resource available.
Fits 2023-current Ford F-250 current Super Duty diesel trucks Use these tire rows for Super Duty planning only when the exact LT size, load range, service description, rim width, and positive-offset wheel setup remain inside the checked route limits.
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 Toyo Open Country A/T III LT305/70R16 124/121R MPN 355570 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

Toyo Open Country A/T III LT305/70R16 124/121R MPN 355570 is an exact SimpleTire row promoted into the truck tire catalog for 2024 Ford F-250 XLT Crew Cab 4x4 Power Stroke planning with official tire-family docs and a current seller price snapshot.

Choose it if

  • Toyo Open Country A/T III LT305/70R16 124/121R MPN 355570 is tracked as an exact MPN row, so shoppers can compare one tire size instead of a broad family label.
  • The 2024 Ford F-250 XLT Crew Cab 4x4 Power Stroke 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 tire rows for Super Duty planning only when the exact LT size, load range, service description, rim width, and positive-offset wheel setup remain inside the checked route limits.

Pass if

  • The Toyo Open Country A/T III LT305/70R16 124/121R MPN 355570 is not the right choice when your truck falls outside 2023-current Ford F-250 current Super Duty diesel trucks, or its trim, engine, and package cannot be matched to the documented application.
  • Pass when this exclusion applies: Tremor, dual-rear-wheel, commercial upfit, or lifted trucks 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 F-250 XLT Crew Cab 4x4 Power Stroke route; Tremor, dual-rear-wheel, plow-prep, lifted, or commercial upfit trucks need their own tire and clearance review.
Workshop & DIY Guidelines

Toyo Open Country A/T III LT305/70R16 124/121R MPN 355570 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

Because the Super Duty utilizes a solid front monobeam axle located laterally by a track bar, any elevation in front coil height swings the axle housing toward the driver side in an arc. A 2-inch front spring level shifts the axle approximately 3/8-inch off-center without a dropped track bar bracket or length-adjustable track bar.

The 2017+ Super Duty platform switched to military-grade aluminum cab enclosures paired with a fully boxed steel frame. In 2020, Ford lowered factory rear spring blocks from 3.5" to 2.0" to ease fifth-wheel towing clearance, and introduced the Tremor package. In 2023, an extensive redesign updated electrical harnesses, integrated bed-side steps, and revised front end aerodynamics.

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.