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weird chain skipping(10 posts)

weird chain skippingcycle_one
Jan 18, 2002 7:32 AM
recently i replaced the chain on my old 7 speed commuter bike. shifting is much smoother and everything seemed great. But when i'm on the small chainring (39) and the third smallest cog and i try to stand or mash really hard, the chain tries to skip up to the next biggest cog and then goes back down. i can spin along in the gear combo no problem. anyone have any ideas? my freewheel is old so does it need replaced too?
re: weird chain skippingMJ
Jan 18, 2002 7:45 AM
if you replace your chain without replacing your cassette you've almost guaranteed skips - it sounds to me like your cassette is worn - most likely you'll have to replace it to get rid of the skips - these things are always worse under mashing hard/lots of power being applied - you can spin quite easily - eventually even pulling away from lights will be difficult

it may be more prone to skipping in the middle riong as it has seen alot of wear/more wear than the other cogs - either way a new cassette will remedy your situation

freewheel should be fine

best of luck
re: weird chain skippingmixinbeatz
Jan 18, 2002 7:46 AM
If you are using the proper chain, and your derailleur is in adjustment, chances are that you need to change the rear cassette as well. A worn chain will wear out your rear cassette which is unnoticeable till you throw on a new chain.
re: weird chain skippingRusty coggs
Jan 18, 2002 8:20 AM
Skipping teeth on a cog is worn cog.Skipping from cog to cog is derailer adjustment.Try a 1/4 or 1/2 trun clockwise on the barrel adjuster on the back of the derailer.
re: weird chain skippingChen2
Jan 18, 2002 8:53 AM
This sounds like a cable tension issue. Rusty is probably right. Shift the rear derailleur all the way to the right, chain on big ring. Make sure the rear der is aligned with the smallest cog, to assure proper indexing. At this position you should have no slack in the cable. You should be able to shift to each successive cog with one click of the shifter. If you are properly indexed a cable that is too tight will cause your derailleur to try to shift to the next larger cog (lower gear). If the cable is clamped to the derailleur "in the right ball park" then tension adjustments can be made with the barrel adjuster. There are many informational sites and books than can explain this better than I can.

-Al
Rusty is wrongMJ
Jan 18, 2002 8:59 AM
I'm not flaming you man - but if you buy a new chain and use it on an old worn cassette and things begin skipping the cassette needs to be replaced - it's not rocket science

a new chain doesn't change the cable tension or the rear mech - and when my chain skips it sometimes skips up and down looking for teeth to catch on

it's worth making sure that the tension and rear mach is adjusted properly - butdo it after you get a new cassette cause otherwise it'll never get fixed
Cable Tension Adjustment is Free - New Cassette = $$B2
Jan 18, 2002 12:05 PM
Given the circumstances - it sounds like a worn cassette to me also. However.... Wouldn't it make more sense to adjust the cable tension first just to be sure?

Bryan
Settle ArgumentChen2
Jan 18, 2002 9:34 AM
Cycle One, get it fixed and let us know which of us guessed right, please.
It's time for...click-clack
Jan 18, 2002 1:07 PM
Stump the Chumps!
not weird at all!Rusty McNasty
Jan 18, 2002 3:07 PM
This is typical when you wear out the chain too far, then only replace the chain. The cogs are toast, so replace them!