$59.46 - $59.99
Incorrect or missing product information? Let us know
Please select the issue
Your feedback has been received! Thank you for helping us improve our site.
Simply fit this sprocket to your existing 10 speedd cassette, using the clear instructions provided, and say goodbye to your front shift setup.
See the compatibility chart here Click here to enlarge
Q: Can I use the 40t expander cog with a 36t cassette
A: We don't recommend using the 40t expander cog with a 36t cassette. Shift performance will be compromised as the timing will not be correct.
Q: Can I use the 42t expander cog on my 34t cassette?
A: The 42t expander cog WILL NOT work with 34t max cassettes. A 6 tooth jump is the maximum for good shifts.
Q: I have a short cage dérailleur on my bike. Will that work?
A: We recommend a medium or long cage dérailleur
Q: Why do you only have a 42t expander cog for SRAM cassettes
A: The 40t is available only for Shimano as SRAM is not offering a 34t cassette.
Q: Is it hard to setup the expander cog?
A: It's really not too hard, but you are working at the extreme limits of your rear dérailleur. If you have specific questions about the setup and adjustment, we recommend heading to your local bike shop.
Q: I have a really worn drivetrain. Will the expander cog work ok on my bike?
A: Old drivetrain components could cause poor shifting performance. We recommend a new chain and a new or well-cared for cassette.
We will happily refund any item purchased on Wiggle if returned to us within 365 days; excluding Wiggle gift vouchers, nutrition and customised products, except when faulty.
Please note: Bikes and other bulky items cannot be returned using our local returns service (where applicable). Please contact us and we can arrange to collect these from you using our discounted courier rates. There is a fee for all collections, except for faulty products.Returned goods must be unused and supplied with their original packaging, unless the goods are faulty. Wiggle will pay the return postage costs for any faulty items.