My kids are riding with M640 Zee wide ratio mechs, which claim they can handle up to a 36t cassette. Does anyone know if that’s realistic or how much bigger a cassette I can use? The sunrace 10-speed 11-42 looks mighty tempting.
I have a similar experience to kelvin, in that I couldn’t get the zee to work with anything bigger than 36. Switched the cage for a oneup RadR cage and now works happily with a 42. They’re like hens teeth to get hold of these days though.