[Grande]

(This is actually happening in my road wheel - Ritchey WCS)

There is a wobble in the cassette. It is obvious when on the bikestand coasting.

Ideas?

 

[shiggy]

Normal. Ignore it.

 

[Mtn-Rider]

Never had a bike where the cassette didn't wobble, just don't look at it!

 

[Grande]

I am no newbie. It ain't no ordinary wobble. It was wobbling like crazy.

 

[FBinNY]

I am no newbie. It ain't no ordinary wobble. It was wobbling like crazy.

Wobble when coasting is common and normal within a range. It happens because the cassette spins on an axis which is itself spinning with the hub. The two axes, hub to cassette inner & cassette inner to cassette outer don't align perfectly causing the wobble.

Normal is a matter of degree, 1-2mm is fairly common, more so might indicate that the cassette body is partly unscrewed from the hub. You can do a quick check by removing the wheel and seeing if you can move the cassette with respect to the hub, but the only definitive check is to follow the procedure for replacing the cassette for your particular hub. This often involves removing the cassette, then the axle, then accessing an internal screw or locknut inside the hub with a 12mm hex key.

 

[shiggy]

I am no newbie. It ain't no ordinary wobble. It was wobbling like crazy.

Your OP reads like the usual newbie question (similar to the "broken/missing" teeth on the rings/cogs questions).

If this is truly in excess of the norm and a recent development, make at least a quick check of the situation and include more details. Will save us all a lot of time.