XT SM-RT78 rotors are both high performance & lightweight, using the proven Shimano Centre-Lock system giving increased strength & security with an easy set-up Precision cut & drilled heat treated stainless steel braking surface improves pad clearing in muddy conditions while aiding cooling under high load Large 5-arm alloy spider is a highly rigid & lightweight support for the rotor surface Super polished braking surface gives excellent brakingperformance ...

SORA is an "easy riding" component group for a more casual sport-recreation road bike. Just like the top-line road groups, SORA's Dual Control Levers give you the advantage of hands-on-bars shifting. Rider-friendly features make the SORA-equipped bike a high-performer that's fun & easy to ride. ...