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Rear hub/Cassette wiggle??????(9 posts)

Rear hub/Cassette wiggle??????The Flash
Jul 30, 2003 11:51 AM
When the bike is on the stand, and I start the back wheel spinning, the cassette seems to move slightly left to right and you can hear the freehub sound going up and down. These are Zipp hubs on a Zipp Carbon hub. Wheel spins freely, so I don't think it is the bearings, it almost seems like the freehub knocked out of alignment with the hub. Any ideas as to what could have caused this and is it fixable?

Thanks!

Scott
The bad news is that it's not fixable,TJeanloz
Jul 30, 2003 12:21 PM
The good news is that a cassette doing the hula dance is completely normal. It is a little disconcerting the first time you observe it, but all modern rear hubs do it to some degree. It wobbles to facilitate faster shifting at the ramps.
The bad news is that it's not fixable,The Flash
Jul 30, 2003 12:30 PM
Serious?!?!?!

The whole cassette moves together as a group, and it moves about a mm or so. It' designed like that? I would have assumed you would want it kind of straight. Seems like this could cause chain slippage if it wiggle at the right time.

Scott
Yes, I'm serious,TJeanloz
Jul 30, 2003 12:35 PM
A 1mm move isn't even all that dramatic. It is completely normal, but it isn't nearly enough to throw a chain. I've seen K-Mart quality bikes that wobble significantly more than that.

I think you're going to have to trust me on this one.
Yes, I'm serious,The Flash
Jul 30, 2003 1:07 PM
Ok, I'm the trusting type, so I'm not going to rip my wheel apart. Good thing, I really like these hubs anyway. That carbon in the middle is just dang cool.....

thanks!

Scott
The bad news is that it's not fixable,litesp
Jul 30, 2003 12:52 PM
I agree also. As the wheel spins, the whole cassette and sometimes appear to floating on a fluid. It is normal to see a small amount of wobble but not up and down movement. The assembly should not make unusual noises. The freehub should not feel loose by hand.
The bad news is that it's not fixable,The Flash
Jul 30, 2003 1:10 PM
That's exactly what it looks like! Thanks for the info...I'm gonna go riding now!

Scott
Are you sure it isn't the ramp teeth giving the illusion?niteschaos
Jul 31, 2003 8:43 AM
My cassette doesn't wobble, but the teeth on the ramps are cut differently and catch the light to give the impression that it wobbles. I've measured it and there is a small amount of lateral play on the freebody, but not nearly a mm.
Freewheels did this long before ramps were invented. nmdzrider
Jul 31, 2003 9:12 AM