Progressive Suspension Slammer Suspension Drop Kit - Black B28-1003B Drop-in spring kit does not require the disassembly of the fork and can be installed in 20 minutes with the forks still on the bike on most bikes Dropped fork springs and stubby shocks for the complete price-friendly package Entire kit set up to go from box to bike in under an hour with basic tools Lowers rear end up to 2.5in. Lowers front end up to 2.0in.