.900 offset sprockets are the maximum offset that can be used without any modification to the stock inner primary. This makes it possible to run a 180 rear tire with no transmission offset or primary drive monkey-business required. Some rear fender modification may be required
.500 offset sprockets series permits use of a wider tire than stock and great flexibility in dialing-in your secondary drive ratio
.200 offset sprockets are modeled after the factory 21 tooth sprocket, except this series is available with various tooth counts for flexibility in dialing-in your secondary drive ratio