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@villa-ru
I was out on my MTB the other day and after a particularly gruesome attempt at a jump I found had no traction and was just spinning. I stopped and everything looked normal, but it was 'freewheeling' forward as well as back.
Turned over the bike and took off the rear wheel and then the cassette was catching properly and all seemed ok again.
Riding home after a long freewhweel down from wimbledon village I again had no forward purchase - pedalling wasn't driving anything. Stopped, upended the bike and jiggled it a bit till it engaged again (not after any specific bit of jiggling) and it was OK to get me home.
Any idea what the problem is and how to mend it (if that description of the problem makes sense)? I can't imagine it is anything good...
Cheers!