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.
Format boost - 3mm offset - chain line 52mm Sram directmount 3 screws.
For Cyclo Cross, Gravel bike with Braze on standard .
super boost / short spindle - 0mm offset - chain line 52mm Sram directmount 3 screws.