Chain dropping onto chainstay

symo

OK, set off this morning to try to cover 70 miles and was back in the garage 20 minutes later. Which means I will not have beaten the snow tomorrow now :x Will do time today on the turbo but its not the same is it?

Rear derailleur cogs all line up with the cassette. Rear mech appears to have problems keeping the chain tight, and when the bike free wheels the chain is dropping on the chainstay, had the bike up on the stand and it seems worse on the back pedal. Admit I should have tried another wheel but was so cold this morning 0630 that I couldn't be bothered to try.

I have read elsewhere that the freehub may have gone. (Shimano RS10's) so is it a case of new rear wheel? Or should I check the hangar alignment by replacing the hangar with the new one I have?

jermas

It sounds like the freewheel/freehub is sticking. Strip rear hub using cone wrenches. The freewheel can be removed using 10mm allen key. Remove the seal on the rear of unit, spray with penetrent or white spirit-flushing out old oil/grease. Dry, then spray thin liquid grease or non sticky chain oil inside unit. If the freewheel is too far gone it can be replaced. Clean and inspect bearing surfaces and ball bearings. Regrease and assemble.

http://www.parktool.com/blog/repair-help/freehub-service this should help.

nicklouse

Sounds like the cold is getting to it. Been out in the wet recently?

symo

Yes out in the cold and wet, although it did spend last night inside having crud guards (badly) fitted.

Will strip and regrease then.

John.T

Check the 'B' pivot is not seized up. This will stop correct chain tension. Otherwise it is probably the freehub as above.

symo

Went to East Street Cycles this afternoon and was advised it is common, the best remedy is to pee on the hub to warm it up great advice, great shop (although way too much Trek) helpful staff though. Going to see how it is, will give it time to warm in the sun and then spin it. After that will double check derailleur alignment.