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Hybrid Rugged Terrain Performance in a 37-Inch Package with the Toyo Open Country R/T Pro
The Toyo Open Country R/T Pro in 37x12.50R20LT is a hybrid rugged terrain tire engineered for truck and SUV owners who split their time between demanding off-road terrain and daily highway driving. The 358280 combines the aggressive lug patterns and deep void ratios of a mud terrain design with the tread compound stability and noise management of an all-terrain, delivering confident grip on dirt, sand, mud, rock, and snow without the road noise penalty of a full M/T. A three-ply polyester sidewall construction resists cuts, chips, and punctures from sharp rock and trail debris while supporting heavy loads and maintaining casing integrity at aired-down pressures for technical terrain. The 19.9/32 tread depth provides an extended wear lifecycle backed by Toyo's 45,000-mile limited warranty. Load Range E with a 126 load index supports up to 3,750 lbs per tire at 65 psi, covering the demands of 3/4-ton and 1-ton truck applications with towing and payload requirements.
Key Features
- Hybrid rugged terrain tread pattern with omni-directional tread blocks for mud, snow, dirt, and rock traction
- Three-ply polyester sidewall resists cuts, chips, and punctures from trail hazards and sharp rock
- Deep 19.9/32 tread depth for extended tread life and traction longevity
- Advanced tread compound resists cuts and chips and promotes even wear
- Three-variable pitch pattern reduces pattern noise on pavement between off-road runs
- Massive staggered shoulder lugs claw at uneven terrain and channel mud and debris clear of the contact patch
- Reinforced belts and terrain-focused compound balance tread life with off-road traction
- Load Range E rated for up to 3,750 lbs per tire at 65 psi max cold inflation
- 45,000-mile limited mileage warranty
- Non-directional tread design allows standard rotation patterns
Specifications
| Detail | Value |
|---|---|
| Part Number | 358280 |
| Brand | Toyo Tires |
| Model | Open Country R/T Pro |
| Size | 37x12.50R20LT |
| Service Description | 126Q |
| Load Range | E (10-ply rated) |
| Load Index | 126 (3,750 lbs max per tire) |
| Max Air Pressure | 65 psi |
| Speed Rating | Q (up to 99 mph) |
| Overall Diameter | 36.8 in |
| Section Width | 12.5 in |
| Tread Depth | 19.9/32 in |
| Rim Width Range | 8.5 to 11.0 in |
| Measured Rim Width | 10.0 in |
| Revs Per Mile | 565 |
| Weight | 78 lbs |
| Sidewall | Black Sidewall |
| Tread Type | Hybrid RT (non-directional) |
| Mileage Warranty | 45,000 miles |
| UPC | N/A |
What's Included
- 1x Toyo Open Country R/T Pro tire, 37x12.50R20LT 126Q E/10 (358280)
About Toyo Tires
Toyo Tires is a global tire manufacturer headquartered in Osaka, Japan, with a strong presence in the North American truck and SUV off-road tire segment. The Open Country lineup is Toyo's flagship series for light truck and 4x4 applications, spanning all-terrain, mud terrain, and hybrid rugged terrain designs. Toyo develops all Open Country compounds and tread patterns in-house and tests across a range of climates, altitudes, and terrain types before release to market.
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Frequently Asked Questions
What is the Toyo 358280?
The Toyo 358280 is the Open Country R/T Pro in 37x12.50R20LT 126Q E/10 sizing. It is a hybrid rugged terrain tire that blends mud terrain aggressiveness with all-terrain on-road manners, featuring a three-ply sidewall, deep 19.9/32 tread depth, and a 45,000-mile warranty. It is designed for full-size trucks and SUVs running 20-inch wheels with 8.5 to 11-inch widths.
What is the difference between the Open Country R/T Pro and the regular Open Country R/T?
The Open Country R/T Pro is an upgraded version of the original R/T, featuring a more aggressive tread pattern, a deeper 19.9/32 tread depth compared to the standard R/T, and a heavier-duty multi-ply sidewall construction for improved cut and puncture resistance. The R/T Pro targets drivers who use their trucks in more demanding off-road conditions and need a tire that holds up to sharp rock, heavy hauling, and aired-down wheeling.
What load range and ply rating is the 37x12.50R20LT 358280?
The Toyo 358280 in 37x12.50R20LT is a Load Range E tire with a 10-ply rating. It supports a maximum load of 3,750 lbs per tire at 65 psi cold inflation. This load rating makes it well suited for 3/4-ton and 1-ton trucks with towing and hauling requirements.
What rim width does the 37x12.50R20LT Toyo R/T Pro fit?
The Toyo 358280 in 37x12.50R20LT fits rim widths from 8.5 to 11.0 inches. The measured or ideal rim width is 10.0 inches. Running the tire on rims within this range ensures correct sidewall profile, load distribution, and warranty validity.
Does the Toyo Open Country R/T Pro have a mileage warranty?
Yes. The Toyo Open Country R/T Pro carries a 45,000-mile limited treadwear warranty. This is one of the longest mileage warranties available in the hybrid rugged terrain tire category. Warranty coverage requires proper inflation, rotation, and vehicle alignment per Toyo's warranty terms.
Is the Toyo 358280 a mud terrain tire?
The Open Country R/T Pro is classified as a hybrid rugged terrain tire, positioned between a traditional all-terrain and a full mud terrain. Its tread pattern and void ratios provide significant mud and loose terrain traction, but its compound and pitch sequencing are tuned to deliver better on-road manners and lower noise than a full M/T. Drivers who spend 50 to 70 percent of their time on pavement with weekend off-road use will find the R/T Pro a better balance than a dedicated mud terrain.
What vehicles does the 37x12.50R20LT fit?
The 37x12.50R20LT is a popular fitment for lifted full-size trucks running 20-inch wheels, including Ford F-250, Ford F-350, Ram 2500, Ram 3500, Chevy Silverado 2500HD, GMC Sierra 2500HD, and similar platforms. A lift of at least 4 to 6 inches is typically required to clear a 37-inch tire on these vehicles without trimming. Always verify clearance for your specific lift, wheel offset, and suspension travel before mounting.
Does the Toyo R/T Pro perform well in snow?
Yes. The Open Country R/T Pro's omni-directional tread block design, increased void ratio, and lateral grooves provide meaningful snow traction for a non-dedicated winter tire. The deep 19.9/32 tread depth helps maintain performance as the tire wears. For severe winter use with extended periods of ice and heavy snow, a dedicated winter tire is recommended, but the R/T Pro handles light to moderate snow conditions well for a year-round all-season-rated tire.
Installation Instructions
- Verify the 37x12.50R20LT size will clear your wheel wells, suspension components, and body at full droop and full compression before purchasing. A minimum 4 to 6 inch lift is typically required on full-size trucks.
- Have tires mounted and balanced by a qualified tire technician on approved wheels with 8.5 to 11.0 inch rim widths.
- Inflate to the vehicle manufacturer's recommended cold tire pressure for your load. Do not inflate to the max 65 psi stamped on the sidewall for normal street use.
- Torque all lug nuts to the vehicle manufacturer's specification after mounting.
- Perform a wheel alignment after installing a new tire size, especially if the overall diameter differs from the previous tires, to prevent uneven wear and maintain steering accuracy.
- Break in new tires by driving at moderate speeds on smooth roads for the first 300 to 500 miles. Avoid aggressive acceleration, hard braking, or off-road use during break-in.
- Rotate tires every 5,000 to 7,500 miles per Toyo's warranty requirements to maximize tread life and warranty eligibility.
WARNING: This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.
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