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Freewheel skipping a beat?

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Freewheel skipping a beat?

Old 08-29-05, 06:46 AM
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jeff-o
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Freewheel skipping a beat?

Hey, I've got a problem with my rear freewheel/bb/derailleur. Sometimes when I push hard on the pedals (like accelerating from a stop), it seems like my bike skips a beat. It goes Ka-chunck once, then the rear wheel engages and I'm on my way. I know I'm properly in gear, my shifters work just fine. So, I think it has to do with the freewheel. Should I take it in to the shop to have them check it out? The bike is still under warranty and everything.
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Old 08-29-05, 06:54 AM
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Originally Posted by jeff-o
So, I think it has to do with the freewheel. Should I take it in to the shop to have them check it out? The bike is still under warranty and everything.
Sounds like a no brainer.
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Old 08-29-05, 07:56 AM
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Originally Posted by sydney
Sounds like a no brainer.
Translation: You have one or more stripped teeth on your cassette cogs. Definetly go back to the shop.
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Old 08-29-05, 08:11 AM
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Originally Posted by CBolt
Translation: You have one or more stripped teeth on your cassette cogs. Definetly go back to the shop.
Is this another no brainer? AKA: nonsense.
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Old 08-29-05, 09:59 AM
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Is it actually stripped cogs, or is it the freewheel? I should take a closer look at the cogs, I guess..
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Old 08-29-05, 10:11 AM
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Whatever....just take it back.
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Old 08-29-05, 01:10 PM
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Originally Posted by jeff-o
Is it actually stripped cogs, or is it the freewheel? I should take a closer look at the cogs, I guess..
It almost certainly isn't "stripped teeth." It could be one of several things causing your problem. Here they are in order of likelyhood:
1) Stiff link in chain. Usually after the chain is attached by the mfgr., the stiff link is loosened as part of initial assembly. If not, the shop should have noticed this during build and/or test ride and fixed it. Every time the section of chain with the stiff link goes through the rear derailleur, it skips a set of cog teeth once it hits the cassette - thus, your ka-chunk!
2) New chain or cassette not meshing with old chain/cassette. If this happens in the smaller cogs (higher gears), then this is the problem.
3) Freewheel/hub pawls not engaging properly. If this is the case, it's a warranty issue, unless you greased the mechanism, which fouls pawl engagement.
Your rear derailleur could also be the cause if it's out of adjustment, but your symptoms point to the above. Good luck.
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Old 08-29-05, 01:49 PM
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Well the chain spins just fine without incident or noises once I'm going. It's just the accelerations from stop where it skips. Everything on the bike is stock, a Trek 7500FX bought this year.

Pawls? Is that the proper name for it? Would they engage properly under low stress/torque, but possibly skip under high torque conditions? I never touched the mechanism, but I rode in the rain a couple times.
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