- Super tough hardened Cro-Moly sprocket from Surly, much more wear resistant than similar Stainless Steel sprockets.
- Full CNC Machined construction, with shot blasting afterwards to increase surface hardness and durability.
- 7.3mm base.
- Compatible with all 1/8" and 3/32" chains.
- Industry standard 1.37" x 24tpi thread fits fixed rear hubs and threaded cranks.
- Ideal for fine-tuning your gear ratio! Never before have 17T and 19T sprockets been readily available for stock riders, and 13T for mod bikes have always been hard to come by. So why not try 18:13 on your mod? Or 17:15 on your stock?
- Weight: 13T - 31.9g. 14T - 37.7g. 15T - 50.9g. 16T - 61.2g. 17T - 64.1g. 18T - 70.3g. 19T - 81.9g. 21T - 100.5g.
Please note that we recommend double wheel tensioners for 15T and smaller rear sprockets. This is to ensure a healthy amount of chain wrap and help to eliminate the chance of the chain skipping.

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