STI R4 Radial Mud Tires

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SKU: sti-r4-radial-8-ply

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*** All New STI R4 is a Massive Mud Weapon ***

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A bigger, bolder and more extreme mud tire, the all-new STI R4 is specifically designed and engineered for high performance UTV applications.


  • Deep lugs, 1.75 up to 2 inches.
  • 9 inches wide, and tubeless.
  • 8-ply radial.
  • Super deep rim guard.
  • Designed for UTVs.


This 8-ply rated, tubeless radial carcass tire measures 9 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 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.

Size Ply Diameter Tread Max PSI Max Load Weight Part#
28-9-14 8 28.2 1.75 18 1,002 lbs. 36.3 209-1825
30-9-14 8 30.2 1.75 18 1,134 lbs. 38.5 209-1827
33-9-20 8 33.2 1.75 18 1,092 lbs. 40.7 209-1850
35-9-20 8 35.2 1.75 18 1,236 lbs. 47.3 209-1855


Thursday, 21 February 2019

R4 utv tire... This tire will be awesome in the mud and the rim guard will be nice, shipping was fast too.

Michael Gammons

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