Se non sbaglio i mozzi delle Roval sono dei DT Swiss (DT240s internals sulle Roval Carbon).
Credo che basti uno di questi kit:
Convert into Sram 11 speed Article No.
Rotor kit MTB Sram XD for XX1 135/5 mm QR HWYAAX00S3115S
Rotor kit MTB Sram XD for XX1 135/10 mm TB HWYAAX00S3218S
Rotor kit MTB Sram XD for XX1 142/12 mm TA HWYAAX00S3188S
Using the conversion kits above, it is possible to convert all existing
DT Swiss Ratchet System® based MTB wheels and hubs into the Sram XX1 11 speed system.
/kappa