I have a problem with my chain slips when pedaling hard. This only happens when the chain is on the middle chainring. I have a new chain, cassette, and derailer and the mechanic at the shop says the chainring doesn't look bad and He just re adjusted the rear derailer. This did not help. Could it be because my crankset is a nine speed and my cassette is only eight? Or could it be a crappy deraihler. maybe the guy at the shop doesn't know as much as i thought and it is the chainring causing it.
If it really only happens in one chainring and that is the one you put the most miles on, it's a pretty likely candidate to be the problem. It's pretty hard to "see" when a chainring is worn enough that it will start slipping, even for an experienced mechanic.
Another possibility is the freehub, but that should cause slipping in any gear combination.
(03-07-2012, 02:50 PM)RBurrelli Wrote: (03-07-2012, 12:10 AM)bbryan555 Wrote: I have a problem with my chain slips when pedaling hard. This only happens when the chain is on the middle chainring. I have a new chain, cassette, and derailer and the mechanic at the shop says the chainring doesn't look bad and He just re adjusted the rear derailer. This did not help. Could it be because my crankset is a nine speed and my cassette is only eight? Or could it be a crappy deraihler. maybe the guy at the shop doesn't know as much as i thought and it is the chainring causing it.
Cranksets don't have "speeds". Just gears and pedals.
I agree that it is either the middle gear or the freehub.
Funnily enough, I came upon this problem and it was an intermittent free hub slip. Usually happens with a favoured gear and under load, such as climbing. Replacing the free hub cured it. Hope this is helpful to you.
Cycle the streets of Bristol!
Hi I my chain slips all the time it's a new chain and I've checked the chain rings and the wheel and all the rest it's just note is doin it tryed everything not sure wot it cud be any can help me