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amont of play in sm rotor?

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how much play (if any) is there meant to be in sm rotor? mines allways had a bit but i think its got worse, ther about 2mm. i've put link to a video

 

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Back in 92 when the kx's came out with floating rotors, so loose they actually rattled. I wouldn't go out an buy a new rotor if it works okay.

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Spray some break cleaner around the rivets and try to wiggle it around. They are made to let the ring expand during braking instead of warping.. I think mine moved a little when new but not now. I wouldn't worry about it unless you can feel the movement in your lever.

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I thought they were meant to have some play. I always hear it move when I move bike back and forth with brake on but yesterday I looked closely at it and it felt like a bit too much then I compared it to my mates nearly new cbr600 and his was pretty much solid so I got a bit concerned coz i don't want it comin apart when I'm braking hard at speed :o

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