Custom developed by BBR Motorsports for the ultimate upgrade for mini four-strokes. Sized perfectly for fast/aggressive adult mini racers. Note: some aftermarket springs increase the length of the stock fork. This will result in bent fork legs! The BBR springs are are stiffer, but are stock length which will ensure proper function and long term durability. These springs are designed for use in stock XR/CRF50, stock DRZ70 forks, and the Z50R (1992-1999).