Grit Master RT 37x13.5R24

The Grit Master RT 37x13.5R24 — also known as the GTM R/T 01 — is a rugged terrain, all-season light truck tire built to handle the kind of punishment that everyday street tires simply can't take. Sized at 37x13.50R24 with a Load Range F (12-ply) rating and a 124Q service description, this is a purpose-built tire for lifted light trucks that spend real time off the pavement. Whether you're crawling over rocks, pushing through mud, or hauling on the highway, the Grit Master RT aims to cover all of it.

Key Features & Benefits

• Aggressive Rugged Terrain Tread Pattern: Crisscrossed tread blocks with biting edges are engineered to grip uneven, loose, and rocky surfaces — so you maintain traction where lesser tires lose it.
• Self-Cleaning Tread Design: Zigzag grooves and open shoulders actively expel mud, snow, and gravel from the contact patch, keeping traction available even in clogging conditions.
• Notched Central Blocks for Mud Grip: Strategically placed notches in the center blocks enhance grip specifically in muddy terrain, improving forward bite when the going gets soft.
• Scalloped & Aggressive Upper Sidewall: Scalloped shoulders boost forward motion off-road while the aggressive upper sidewall design adds an extra layer of off-road performance and impact resistance.
• 12-Ply / Load Range F Construction: Heavy-duty internal reinforcements resist deformation under load. Radial construction distributes pressure evenly across the footprint, reducing flexing and allowing the tire to carry serious weight without compromising handling.
• All-Season Compound: A specialized rubber compound remains flexible year-round, maintaining grip and pliability in cold weather as well as heat — so you're not swapping tires with the seasons.
• Hydroplaning Resistance: Optimized groove geometry helps channel water away from the contact patch, reducing the risk of hydroplaning on wet roads.
• On-Road Handling & Braking: A large road-to-rubber ratio and siped shoulder blocks improve the contact patch on pavement, enhancing braking performance and cornering confidence during everyday driving.
• 50,000-Mile Treadwear Warranty: Grit Master backs this tire with a 50,000-mile treadwear warranty — a meaningful coverage commitment for a rugged terrain tire in this size class.

Specifications

• Size: 37x13.50R24 (LT)
• Rim Diameter: 24"
• Section Width: 37"
• Aspect Ratio: 13.5
• Load Index: 124
• Speed Rating: Q (up to 100 MPH)
• Service Description: 124Q
• Load Range: F (12-Ply)
• Sidewall: Blackwall
• Tread Depth: 15/32nds
• Tread Design: Symmetrical
• Three-Peak Mountain Snowflake (3PMS): Not rated
• Treadwear Warranty: 50,000 miles
• SKU: 221030853

Fitment

The Grit Master RT 37x13.5R24 is designed for light trucks running 24-inch wheels — a popular combination on heavily lifted full-size pickups and SUVs. This is a true LT-metric tire, so it's intended for trucks capable of handling Load Range F load ratings. Verify your wheel's load rating and offset before mounting, and confirm your vehicle's wheel-well clearance accommodates a 37-inch tire — lift kits of 6" or more are typically required on full-size trucks like the Ford F-250/F-350, Ram 2500/3500, GMC Sierra 2500HD/3500HD, and Chevy Silverado 2500HD/3500HD to run a tire this size without rubbing. Always cross-check your specific year, make, model, and lift configuration before ordering. Our fitment team is available to help — call or email us before you buy.

Why Buy from ThreePiece.us

• Free Shipping on Every Order: No threshold, no catches — every tire ships free to the continental US.
• Affirm Financing Available: Break your purchase into manageable payments at checkout with Affirm financing, so you can get the tires you need without waiting.
• Expert Fitment Support: ThreePiece.us has served 10,000+ customers and has 10+ years of experience with custom fitment for lifted trucks, daily drivers, and show builds. Our team can verify that this tire and wheel combo will work for your specific setup before you order.
• Direct Access to Our Team: Call us at 813-535-5801 or email sales@threepiece.us — real people, real answers about your build.
• Price Match Guarantee: Found it cheaper? We'll match it. Shop with confidence knowing you're getting a competitive price.

Frequently Asked Questions

What load rating is the Grit Master RT 37x13.5R24, and is it suitable for towing or hauling?

This tire is rated Load Range F, or 12-ply, with a load index of 124. That makes it a heavy-duty light truck tire suited for vehicles that carry significant payloads or tow trailers regularly. Always confirm total load requirements against your vehicle's GVWR and axle ratings.

Does this tire carry a treadwear warranty?

Yes. Grit Master backs the RT 01 (GTM R/T 01) with a 50,000-mile treadwear warranty, which is notable for a rugged terrain tire of this size.

Is this a mud terrain or rugged terrain tire?

The Grit Master RT is classified as a rugged terrain tire — positioned between an all-terrain and a full mud terrain. It delivers aggressive off-road traction in mud, gravel, and rock while maintaining more on-road composure and noise management than a dedicated mud terrain tire. It does not carry a Three-Peak Mountain Snowflake (3PMS) rating.

What is the availability and lead time for this tire?

This tire is currently listed as a special order item at ThreePiece.us. Lead times may vary — contact our team at 813-535-5801 or sales@threepiece.us for the most up-to-date availability and estimated delivery timeline before placing your order.