---
product_id: 20952477
title: "Cooper Discoverer STT Pro All-Season 35X12.50R20LT 121Q Tire"
brand: "cooper"
price: "$1985.87"
currency: USD
in_stock: true
category: "Cooper"
url: https://www.desertcart.us/products/20952477-cooper-discoverer-stt-pro-all-season-35x12-50r20lt-121q-tire
store_origin: US
region: United States of America
---

# 35-inch diameter for commanding presence All-season tread for year-round grip Armor Tek3 sidewall protection Cooper Discoverer STT Pro All-Season 35X12.50R20LT 121Q Tire

**Brand:** cooper
**Price:** $1985.87
**Availability:** ✅ In Stock

## Summary

> 🛞 Rule Every Terrain, Every Season — Tire Tech That Means Business

## Quick Answers

- **What is this?** Cooper Discoverer STT Pro All-Season 35X12.50R20LT 121Q Tire by cooper
- **How much does it cost?** $1985.87 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/20952477-cooper-discoverer-stt-pro-all-season-35x12-50r20lt-121q-tire)

## Best For

- cooper enthusiasts

## Why This Product

- Trusted cooper brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Armor Tek3 Durability:** Reinforced sidewalls resist damage from boulders and rough terrain, keeping you unstoppable.
- • **All-Season Versatility:** Engineered for exceptional traction on wet, dry, and snowy roads without compromise.
- • **Stone Armor Technology:** Innovative tread channels expel lodged stones, preventing damage and maintaining peak performance.
- • **Heavy-Duty Load Capacity:** Supports up to 3,195 lbs with a robust 10-ply radial construction for serious hauling power.
- • **Unmatched Off-Road Dominance:** Conquer rocks, mud, and sand with deep Climber Cleats and Mud Slingers 2.0 trenches.

## Overview

The Cooper Discoverer STT Pro 35X12.50R20LT 121Q is a premium all-season off-road tire designed for extreme performance and durability. Featuring patented Armor Tek3 sidewall technology, advanced tread patterns like Climber Cleats and Mud Slingers 2.0, and Stone Armor channels, it delivers superior traction and resistance to damage across diverse terrains. With a 35-inch diameter, 10-ply radial construction, and a 3,195-pound load capacity, this tire is engineered to empower serious off-road enthusiasts without sacrificing on-road control.

## Description

The Cooper Discoverer STT Pro All-Season 35X12.50R20LT 121Q Tire is the most extreme all-season, off-road tire Cooper offers to date, providing remarkable off-road performance without sacrificing on-road traction. The Discoverer STT Pro tire delivers best-in-class off-road performance, empowering the extreme off-roader to take on the toughest challenges. Patented Armor Tek3 tire technology adds strength to the tire sidewall, providing increased resistance to damage while driving over boulders and uneven, tough terrain. The Discoverer STT Pro comes with rubber formulated to combat shredding and damage from stones and off-road obstacles. The ROCK CLIMBER SIDEWALL gets max traction to help conquer even the toughest obstacles with deep ‘Climber Cleats’ and Flex Grooves built into the side of the tire that grip jagged rocks and power through thick mud. The MUD SLINGERS 2.0 are deep, wide trenches with additional notches throughout the tread combine to give you more grip to power through and help continuously clear thick mud from the tire. The EARTH DIGGERS can tackle tricky terrain with large blocks with alternating mud scoops that forcefully dig into loose dirt, sand or sticky mud. The STONE ARMOR TECHNOLOGY provides the ultimate durability with channels, ridges, and edges designed to help defend against sharp rocks and debris while expelling lodged stones.

## Features

- All-Season Off-Road Traction Tire
- The most extreme all-season, off-road tire Cooper offers to date
- Provides remarkable off-road performance without sacrificing on-road traction
- Tread design helps to prevent stone retention
- Armor Tek3 construction for added tire durability

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B017XTWD0U |
| Automotive Fit Type | Universal Fit |
| Best Sellers Rank | #274,501 in Automotive ( See Top 100 in Automotive ) #343 in Light Truck & SUV All-Terrain & Mud-Terrain Tires |
| Brand Name | Cooper |
| Construction Type | Radial |
| Customer Reviews | 4.5 4.5 out of 5 stars (250) |
| Global Trade Identification Number | 00029142829751, 00781787879538 |
| Included Components | Tire Only |
| Item Diameter | 34.69 Inches |
| Item Dimensions | 34.69 x 34.69 x 12.4 inches |
| Item Type Name | Tire |
| Item Weight | 68.87 Pounds |
| Load Capacity | 3195 Pounds |
| Load Index | 121.0 |
| Load Range | E |
| Manufacturer | Cooper |
| Manufacturer Part Number | 170128006 |
| Manufacturer Warranty Description | Standard Limited Warranty |
| Model Number | 170128006 |
| OEM Equivalent Part Number | COOP-90000023673 |
| Ply | 10-Ply |
| Rim Size | 20 Inches |
| Rim Width | 10 Inches |
| Seasons | Year Round |
| Section Width | 12.5 Inches |
| Size | 35X12.50R20LT 121Q |
| Spare Tire Mounting Location | Front or Rear |
| Speed Rating | O |
| Tire Aspect Ratio | 12.5 |
| Tire Diameter | 35 Inches |
| Tread Depth | 21 32nds |
| Tread Type | Non-Directional |
| UPC | 029142829751 781787879538 |
| Unit Count | 1.0 Count |
| Vehicle Tire ISO Metric Size Description | 889/12.50R20 |

## Product Details

- **Brand:** Cooper
- **Load Capacity:** 3195 Pounds
- **Load Index:** 121.0
- **Rim Size:** 20 Inches
- **Section Width:** 12.5 Inches
- **Size:** 35X12.50R20LT 121Q
- **Speed Rating:** O
- **Tire Aspect Ratio:** 12.5
- **Tread Depth:** 21 32nds
- **Tread Type:** Non-Directional

## Images

![Cooper Discoverer STT Pro All-Season 35X12.50R20LT 121Q Tire - Image 1](https://m.media-amazon.com/images/I/81yAZbtaAIL.jpg)
![Cooper Discoverer STT Pro All-Season 35X12.50R20LT 121Q Tire - Image 2](https://m.media-amazon.com/images/I/81I28TchhBL.jpg)
![Cooper Discoverer STT Pro All-Season 35X12.50R20LT 121Q Tire - Image 3](https://m.media-amazon.com/images/I/81xvHD9ODOL.jpg)
![Cooper Discoverer STT Pro All-Season 35X12.50R20LT 121Q Tire - Image 4](https://m.media-amazon.com/images/I/91YhnE1-VBL.jpg)
![Cooper Discoverer STT Pro All-Season 35X12.50R20LT 121Q Tire - Image 5](https://m.media-amazon.com/images/I/51giAMFQoeL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: Do these have white letters?**
A: This is going to be an all black sidewall. Thanks!

**Q: are these 10 ply tires?**
A: Listing states 10 ply

**Q: How badly will my MPGs drop with these tires?**
A: I lost almost 20%.  That being said... They are awesome tires.

**Q: Will these fit on a 15x8 wheel?**
A: Hello, 
These will not fit a 15x8 wheel.  This tire fits a15x8.5" to 15x11" wheel. 
Thanks,

## Frequently Bought Together

- Cooper Discoverer STT Pro All-Season 35X12.50R20LT 121Q Tire
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- Roundrule Xtra All Steel Heavy Duty Premium Trailer Radial Tire-ST235/80R16 235/80/16 235/80-16 129/125M Load Range G LRG 14-Ply BSW Black Side Wall

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-07-14*