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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Rear Rotor is bent....
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[QUOTE="David Trustrum, post: 168614, member: 21529"] Hi Eric, should you use a crescent wrench, or a really big micrometer? (Sorry couldn’t resist, -see feeler gauge thread). When disc rotors warp; the metal gets too hot & expands, either they get a buckle in them or the outside gets bigger than the inside they can ‘cone’ - the outside moves to the left or right. This will flex somewhat. Check the rotor is not coned with a straight edge to be sure. Sadly dirt discs are pretty puny & don’t suffer being dragged for too long. Check if it is bent by taping a piece of metal to the swingarm just about rubbing the disc, or even a marker pen. You will see if it is warped or not. I prefer to straighten discs on the wheel so they remain bolted to the flat plate they will live on. You then proceed to give them a tweek or a tap in the desired area. I have seen a disc bent almost in half on “tree interface”. I would have tossed it but apparently the guy straightened it out with no problem so what would I know? If your pads are wearing fast check that the disc isn’t heavily grooved & that the brakes aren’t dragging. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Rear Rotor is bent....
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