RS125 rear rotor on a MC21

**Sat Apr 02, 2005 11:46 am » Post: #1 » Download Post**

Can anyone tell me if a RS125 rotor will fit a NSR MC21 ? Both have 3 bolt mounting, but not sure of the bolt circle diameter ?
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**Sun Apr 03, 2005 4:07 pm » Post: #2 » Download Post**

Yes they will bolt straight on as the PCD of the holes is the same BUT.........The RS is 35mm smaller in dia' and is only 4mm thick when new with a min' limit of 3.5mm. So you would have to rig up another caliper if you wanted to use one. The caliper would have to be RS125 or eqivalent to the narrow track of the rotor. Personally I think it's a lot of work for nothing. You will have a lighter rear set up but if you have to use it then the extra 136 pounds of the NSR compared to the RS125 will fry the pads. Sad

**Sun Apr 03, 2005 4:55 pm » Post: #3 » Download Post**

Thanks, I found some of that that info. on a site, the NSR rotor is 220mm diameter and the RS125 is 188mm. I saw a wave/floating rotor for sale and thought that looks similar, wonder if it would be a possable replacement ? Oh well would have been nice.

Thanks for the information.
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**Fri Apr 08, 2005 2:18 am » Post: #4 » Download Post**

Yoyodyne makes a Ti rotor for the RS125 and weighs in at like 3 ounces Shocked

.Sweet
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Steve Wenner
2000 TSR 250
2001 Honda RS250
2001 Honda RS125
2005 Honda RS125
1992 NSR 250-300
1992 NSR50