A bigger, bolder and more extreme mud tire, the all-new STI R4 is specifically designed and engineered for high performance. The R4 features super-deep lugs angled to optimize traction performance both forward and in reverse.

STI R4 Features include:

• Deep lugs, 1.75 up to 2 inches
• 9 inches wide, and tubeless
• 8-ply rated radial
• Super deep rim guard
• 28-inch sizes for ATVs up to 35 inches for UTVs

The All-New STI R4 Tire is a Massive Mud WeaponThe All-New STI R4 Tire is a Massive Mud Weapon

This new tire is constructed for durability too, with a rubber compound built for abuse. The R4’s deep rim guard protects your wheels as well. Other tires may look the same, but only the R4 enters the mud with lugs this deep and a carcass this strong – and at a comparatively low weight. Suggested retail prices range from $198 to $256.

About STI Tire & Wheel
STI Tire & Wheel designs and manufactures tires, wheels and tubes for owners of off-road motorcycles, UTVs and ATVs. STI is lead by powersports industry veterans with a deep understanding of the needs of off-road enthusiasts. The company is focused on delivering excellent products backed by industry-leading customer service.



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