Ironman/Dirt Tricks Sprocket Warranty:
All Ironman Sprockets are designed to meet the highest quality and design standards and are guaranteed for 1-year against defects in materials, craftsmanship and excessive wear.

The sprocket will be replaced free of charge, at our sole discretion if any of the following conditions exist: Within 12 months of purchase, any cracking caused during motorcycle operation for which the motorcycle was intended. Any excessive wear: If within 12 months of purchase, the original tooth profile is worn at any point beyond .025" (0.6mm) from its original profile on the majority of teeth. This guarantee does not cover sprockets that have cracking or breakage as a result of insufficient chain slack, cracked and/or missing chain rollers or loose, missing or improperly tightened sprocket bolts or that are damaged from a crash, misuse, abuse or lack of care.
  Original Sales receipt must accompany all claims for consideration. Sprockets considered for guarantee claims will be replaced with same model and size of original. Ironman warrants original Ironman products only and does not cover damage to any other part on the bike that may occur. Ironman Sprockets are intended for off road  use only.

Ironman Sprockets are warranted for 12 months from the date of purchase. 
The sprocket must be returned to: 
Dirt Tricks, Attn: Warranty Dept., 1132-A Airport Rd., Minden, NV 89423

Here is what a worn sprocket looks like. This sprocket is just at the .025" wear limit. This sprocket has been run for over 1000 hours of offroad use, five O-ring chains and 31 Dunlop 695 rear tires. As a sprocket wears the roller slowly eats into the driven side of the tooth. In the picture, the wear is on the left side of the valley, whereas the right side is the original profile. Look for an unsymmetrical tooth form when viewing the profile. Disregard any pattern created by chain lube or side links on the face.