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If your chainsaw is not working properly or you see a decrease in performance, take a look at your sprocket. Sprockets that have worn down or damaged teeth could cause your chain to slip or not spin at all. Gb spur sprockets are made of special carburized heat treatment that hardens the spur and provides superior wear resistance. GB Rim Sprockets are designed for smoother performance, faster cutting and economical use. The center drive system allows the user to change the rim sprockets when they become worn without having to change the entire system. Jack's has the GB Chainsaw Sprockets to keep your chainsaw working properly all season long. Check out our selection below! *If the OEM number on the GB Sprockets end in "N", a bearing is included. If the OEM number ends in "O" a bushing is included.