Hi I'm looking at changing my tyres on my gravel bike from 659b 47mm to 650b 42 so I can use it on the road. The problem I'm having as I've seen the tyres but they have 2 options 27.5 1.75 or 27.5 1.90 whats the difference.
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.