Hi Has anybody tried mounting a regular tire on a Mavic X3.1 UST disc rim? I haven't been able to find a studded tire for USt so I'd like to mount my current Nokian Extremes on this wheel I'm about to build. All the other UST rims from Mavic are clearly stated as ETRTO compatible except these. Including X3.1 UST for Vbrakes and DX3.1 UST disc for downhill. ETRTO means that you can mount either a UST or normal tire on the rim. Mind you not just a tube in a UST tire but the whole tube and tire. I don't know what you call them in English actually. In Swedish directly translated it would be "Edgethreaded" tires. Meaning a thread is running all the way around either edge -- Perre You have to be smarter than a robot to reply.