Massive Mud Weapon

A bigger, bolder and more extreme mud tire, the STI R4 is specifically designed and engineered for high-performance UTV and ATV applications. The 8-ply rated, tubeless radial carcass tire measures nine inches wide. The R4 features super-deep lugs - 1.75 inches at center and 2.0 inches at the shoulder - angled to optimize traction performance both forward and in reverse.

This mud 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 STI R4 enters the mud with lugs this deep and a carcass this strong - and at a comparatively low weight.


  1. Large and Strong Rim Guard.
  2. Super Deep Angled Lugs.
  3. 8-ply rated Radial Carcass.
  4. 9 inches Wide.


Sizes & Specs:

R4
SIZEPLY RATINGOVERALL DIAMETER (Inches)TREAD DEPTH (Inches)MAX PSIMAX LOAD CAPACITY @ 18 PSITIRE WEIGHT (Pounds)PART #
28 / 9R-14828.21.7518.01002 lbs.36.3209-1825
30 / 9R-14830.21.7518.01134 lbs.38.5209-1827
33 / 9R-20833.21.7518.01092 lbs.40.7209-1850
35 / 9R-20835.21.7518.01236 lbs.47.3209-1855
See vehicle label or owners manual for operating pressure

Comments are closed.