For seat tube diameter 34.9 mm, high mount standard
For seat tube diameter 34.9 mm, low mount standard
This SHIMANO© collar reducer allows you to mount a collar chain guide on a seat tube of 31.6mm of 28.6mm.
For direct mount frame, D standard .
For direct mount frame, E standard .
For Cyclo Cross, Gravel bike with Braze on standard .
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