The r45 hubset is 20 lighter than their classic hubset with a sleek new hubshell bodies and new 17mm axles that39s 17mm from dropout to dropout resisting deflection during cornering or when the power is full on they have designed a driveshell with a twin bearing design and responsibly removed as much weight as they could from the inner components even the patented ringdrive engagement system was redeveloped resulting in a quiet fast engaging 45 tooth stainless steel system unique to the