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what rotor size?

NRSracer

Jamis Slayer
Sep 7, 2001
502
0
Baltimore
I'm buying Avid Mech discs sometime in the near future, but i'm confused on which rotor size to get. If compatibility is an issue, I will be putting them on a Giant NRS 3 and a Judy C. I prtty much ruled out 203mm, but i don't know whether to get 185 or 160. i will be doing xc riding.