Shimano SM RT81-ss /// SM RT99 SS rotors.

Page may contain affiliate links. Please see terms for details.

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.
 
OP
OP
wyre forest blues

wyre forest blues

Über Member
Cancel the above question.. I have sorted it .. For anyone interested the only difference is that the RT99 have additional cooling fins to aid cooling of the rotors.
 
Top Bottom