Trek has a service bulletin for people with chain retention issues.
Quoted from another source...
7mm of lower guide spacing for Transmission drivetrain (which we already knew), 6mm of spacing for bikes equipped with UDH (Non Transmission).
Directly from the bulletin:
An updated upper idler...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.