I have a Kinesis Tripster ATR. The drive-side seat stay has a lug on it whose purpose I can't work out:
There's no such feature on the other seat stay. What is it for?
Bicycles Stack Exchange is a question and answer site for people who build and repair bicycles, people who train cycling, or commute on bicycles. It only takes a minute to sign up.Sign up to join this community
Its a chain hanger. Purpose is to hold the chain when you take the wheel off.
The idea is to support the chain and stop it falling through itself, making a tight loop and shortening the life of those links.
They're not common on carbon bikes any more, but handy on any working bike.
Don't forget to undo the chain after reinstalling the wheel and before riding away.