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Track Sprocket - 9 Link (Pair)
Price (USD) [ $9.95 ] Model Number [ SPRK-02 ] Ship Weight [ 0.09 lbs. ]	Works with our Universal 6mm Hub (HUB-02) and 4mm Hub (HUB-03). Sprocket diameter with tracks is 3.75" Pitch diameter (calculated, not measured) 3.13" Designed to be used back to back for a dual sprocket config.