Disc Brake help
So I have been a die hard user of rim brakes who is getting to the point of wanting to switch. The question I have is about rear rotor diameter. I know that Juicy ultimate has a 140 rear rotor option...however that is not present in any of the lower lines (carbon or 7). I assume you can't just buy a 140mm rotor and use it... so what is the proceedure with this?