E*thirteen Helix Race Cluster 12S sprocket Sram, Shimano

When installing the Helix R cassette, as with any cassette, we recommend checking chain wear. If your chain shows 0.5% or more wear, you will significantly decrease the wear life of your new cassette. Installing a new chain with your new cluster is a much better and economical solution.

Features

• 12 Speed.
• Teeth: 42, 50.
• Compatibility: Sram, Shimano.
• Material: aluminium.
• Range:9-50 D: 556%.
• Real weight: 177 g.

Cassette 9-36T not included