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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Is my hub bent or the brake rotor?
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[QUOTE="O3RM125, post: 1259159, member: 82886"] The rim is straight. The brake rotor is what seems to be un-true/bent. Or possibly the mounting points on the hub for the rotor. If I lift the front wheel off the ground while the bike is on the stand and spin it, you can see the caliper moving back and forth as the rotor turns through the caliper at the point where it is bent, you can also see a "wave" or bent area in the rotor itself when looking from the front when the wheel is spun. The caliper is made to move this way obviously(full floating caliper) but due to the un-true brake rotor it is having to move in and out every revolution which I am sure isnt normal with a true rotor(Im an auto mech. and disc brakes arent anything new to me). When I spin it by hand I can get about 3 revolutions, during each you can hear the rotor come into contact with the pads and then move away from the pads as the wheel and rotor turn further through the revolution, along with the sound is the visual of the caliper moving in and out. Its hard to guess how far the caliper is moving in and out, it is not bottoming out the floating ability of the caliper even with new pads in. I know there is a spec limit on the rotor for runout, or warpage etc, but I have no way of testing that right now. [B]My main concern was for the front hub[/B], and if it could be bent, it seems to me the hubs mounting points are quite beefy and it would take alot to tweak one so I am assuming I just have two bent rotors, but placing the one I got from ebay on a flat surface and turning it remains flat on the surface as if it were perfectly true. If I had it to do over again I would have just spent the extra $20 a new replacement rotor least I would know for sure then :bang: Anyone ever experiance a brake rotor mounting point on a hub being bent? I am sorta ruling that out just based on the strength of the hub and figuring I have two bent rotors. Ill probably pick up a new rotor sometime soon and hope its not the hub. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Is my hub bent or the brake rotor?
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