Replacement cogs for Speedhubs . See Hub Tools for Rohloff sprocket removers . Existing Rohloff hubs can be updated to spline carrier system by using RH8430 in conjunction with a spline sprocket. Splined sprockets can be reversed to extend wearItem Specifications: Chain: 3/32", Description: Splined Sprocket, Steel, Hub Type: Rohloff Speedhub, Teeth: 18, Color: Silver, Model Name: Speedhub Sprocket,