Topic: Hub slipping?

[Rockhopper]

Hi. I have a mechanical issue. Occasionally, when I stand up to pedal on my mountain bike, the cranks spin as if there is no chain attached. It kind of feels like that sensation you get when you break your chain: no power to the wheel at all. It lasts about half a crank turn and then re-engages. It only happens when I put a lot of downward power on the cranks. The chain is not skipping at all. So far I have not hurt myself, but one time I nearly slammed my face into my handle bars.




About six weeks ago, I bought a new rear wheel (including a new Chris King hub) and added a new cassette and chain. All of it was assembled and installed by professionals. The problem started pretty much right after I got the new wheel and now it seems to be getting a bit worse. Is there something wrong with my new hub? It only has about 400 miles on it. Is it something else? Any thoughts? Many thanks.

[AlwaysGoForward]

odd problem. only thing which comes to mind...
you said the chain is not slipping (on the cassette) - a new chain can also slip on OLD chain rings in the way you described.
Jeff

[Murf :]

Just took apart a Chris King hub this weekend that was having the same problem. In this case the ring drive was worn in a few areas and was causing the slip. No fix was found other than replacing the worn parts. Likely caused by play in the axle / hub.