wyre forest blues
Über Member
The rear rotor on my Giant Defy Advanced pro 1 is showing signs of wear and needs changing. The current rotor is the Shimano SM RT81-ss (140mm). I am having difficulty sourcing this rotor so looking at the Shimano compatability chart it appears the SM RT99-SS (or the SM RT99-A-SS) is compatable. Does anyone know the difference in the two models (also in the 'A' model of the 99 ss)
Thanks in advance.
Thanks in advance.