Fatboy 135mm x 9mm
Sequel 15mm Through Axle Fits most 15mm suspension forks
20mm Through Axle Standard Fits most forks that have a 20mm axle and designed to work with Manitou, Marzocchi, White Bros, RockShox, Risse, Stratos, etc...
Lefty Designed exclusively to be used with Cannondale's Lefty forks.
Riser Fixes fork clearance problems such as disc brake calipers coming in contact with standard racks.
Specialized Fits 2007 and beyond Specialized 25mm through-axle dual crown forks.
DH24 To be used with 24mm axles like the Maverick fork.
Pugsley Fits the Surly Pugsley front fork