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Our active bump stop system was developed for sprint car teams of all levels. They offer your team the ability to tune your bump stop and keep up with changing track conditions as the night goes on. When used effectively they can help keep the car from "losing the LR" off the corner as well as giving you the ability to precisely time the car getting to the RF. SST Bump Stop Kits come complete with everything you need even if you've never had a bump stop on your car before. Each kit contains 15 bump stop pieces, plastic separator washers, a rigid base washer, shaft spacers and instruction sheets with easy to read guidelines for selecting the correct bump stop for your particular track type and size. Single kits are available in 1/2, 9/16 or 5/8 shaft sizes and are designed for 1/2, 3/8, 1/4 mile tracks.