Bicycle Mechanics - skipping chain on my middle chainring..

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dexmax
10-13-03, 04:24 AM
I am using a Deore LX crank with a shimano IG chain.

It performs ok when I'm not pushing hard on the crank. But when I'm in a rough terrain, and when I push it hard, the chain skips. This only happens when i'm on my middle chainring.. And I only noticed it skipping when my right[leg/foot] is in the downward stroke.

In todays ride, it skipped 4-5 times.

skip = when pedalling, it[crank] suddenly looses resistance, about 45-60 deg rev.

I nearly fell to my right side the last time this happend as I hammered.

Please help..

oldillini
10-13-03, 04:52 AM
I assume you have check chain length.

Had this happen with an old, stretched chain. Since I tend to use middle ring most, I too noticed it when on it and especially when getting on the pedals.
chewa
10-13-03, 06:11 AM
Sounds like wear and tear on the middle ring/chain to me too.

Richard D
10-13-03, 10:16 AM
Shimano chainrings have a reputation for being extremely smooth shifting but quite quick wearing. You might get away with just a new chain but it does sound like a new ring might be in order.
Feltup
10-13-03, 06:20 PM
Are you sure it is slipping on the chainring and not on the cog? If the derailuer is to far to the left or right it can slip.