I want to purchase a spare pin for my Shimano Ultegra 10 speed chain. Looking around I can only see 11 speed pins for sale. Can I put these into a 10 speed chain?
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My understanding is that the chain pins for Shimano 10-speed chains are 6.0mm in length and the pins for the 11-speed chains are 5.8mm in length. That is pretty close, but I wouldn't chance it. I also don't know for sure if the pin diameter is the same and I don't have an 11-speed pin to measure.
A simple google search turns up many places where you can purchase the 10-speed pins. Even better - I have to believe that nearly every local bike shop in your area would carry 10-speed compatible pins.
Since the 11 speed chain is narrower, the connection pin will be narrower than for a 10 speed. While it might work, I certainly wouldn't recommend it.
What you can do is use a SRAM powerlock designed for 10 speed applications.