Rotational movement on centre lock disc brakes - normal?
SitoUK
Posts: 34
HI there
I have a brand new set of wheels with centre lock brake discs (1 week old). When I went to work this morning I noticed the following on both wheels: Even when you completely lock the brake, there is still some rotational movement on the wheel. The disc does not move but the wheel does, maybe a couple of mm at the outer edge or so.
Is this something I need to be concerned about or is it normal? Has anyone noticed the same thing? It certainly never happened with my 6-bolt wheels.
Cheers
Lars
I have a brand new set of wheels with centre lock brake discs (1 week old). When I went to work this morning I noticed the following on both wheels: Even when you completely lock the brake, there is still some rotational movement on the wheel. The disc does not move but the wheel does, maybe a couple of mm at the outer edge or so.
Is this something I need to be concerned about or is it normal? Has anyone noticed the same thing? It certainly never happened with my 6-bolt wheels.
Cheers
Lars
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Comments
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probably the pads moving in the calipers?You don't need eyes to see, you need vision0
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no, definitely not. The disc does not move, there is some movement at the link between disc and wheel. I have the bike on a a bike stand now and you can move the wheel slightly by hand when pulling the brake but it requires a bit of strength.0
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Hmm, just found this: http://forums.mtbr.com/showthread.php?t=581436
The guy says it was a tighness issue. Might be the same thing in my case...as I don't own the tools the dics were mounted onto the wheel by my LBS...might have to give them a call...0 -
might be the case...on the other hand...wheels are only a week old, 100km max on road use, so I would not expect this much wear. I get the impression though that this is not the norm, so I guess a visit to the LBS is due...0
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possible...I should find out tomorrow morning and will let you know what the story is...0
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I had this with some shimano rotors a while back, it was the rivets holding the braking surface to the spider that turned out to be worn.0
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I've seen exactly the same "problem" when i recently changed to Centrelocks, I think its probably just very slight pad movement, couple of mm movement maximum on the outside of the tyre - I've posted previously about the front brake juddering under load and wondered if these things were linked, but i'm pretty sure now that the unwanted ABS type effect was incompatability between the Juicy 3s and the change between the standard CleanSweep2 discs and the Shimano Centrelocks, the outside diameter of both is 160mm, but the inside is less, in other words the brake pad was also rubbing against the spokes on the Shimano disc as its got less surface area than the CS2..if that makes sense...Every time I go out, I think I'm being checked out, faceless people watching on a TV screen.....0
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hmm, interesting, I did the same thing. I've got Juice Threes and changed the original discs to Shimano discs.
However, I think we're describing slightly different scenarios here. As I said, my disc is not moving at all, it's held absolutely tightly by the brake pads. Only the wheel is moving. So the movement is not between brake pad and disc but between disc and hub.0 -
So it's what XCMark says?
That's the trouble with bonded rotors.0 -
well, but you would not expect this to happen after a week I assume....0
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no - they must be faulty if they have not taken any hits.0
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yes, that's what I suspect as well...I called the guys and they'll take it apart tomorrow morning....I just hope I make it home tonight and there tomorrow morning safely :?0
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The tool for the rotors is just a standard cassette tool, or in some cases, a BB tool.0
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ah, interesting, did not know that. Thanks, that should disc exchange make easier in the future..0
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ok, just an update: went to eh LBS today and he simply tightened the center lock a bit more. He used quite some force to do that. So that was it, it's all fine now. Good to know for the future....0
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the spines on XT hubs can and do, "open" up, and the rivets , holding the disc to the "center-lock" get loose
theres more mechanical joins on a center-lock rotor, more to go wrong?
tweek cycles pointed out the play in my front rotor, between the rotor and the center-lock bitGiant Trance X0 (08) Reverb, Hope Hoops 5.1D, XT brakes, RQ BC, Works Components headset 1.50