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drimmdee
Rookie
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Joined: 07 Nov 2007
Posts: 16
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| Posted: Thu Jul 17, 2008 8:43 am Post subject: Chain Wheel/Freewheel Question |
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On my sons bike I tighten the chain, using chaintensioners, as the cranks rotate a full cycle the chain will get very loose and then very tight. The chain gets so tight the cranks make a noise and the chain gets so loose that it falls off. We tried to race last night with a chain ring, and the chain fell off. I have used a chain wheel and it does it with this also to a lesser extent.
Any help would be appreciated. |
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AdvanceCycleryRider
Elite Men
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Joined: 04 Oct 2006
Posts: 1366
Location: Syracuse, NY
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| Posted: Thu Jul 17, 2008 6:18 pm Post subject: |
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With the chain off, spin the cranks. See if the chainwheel or sprocket spins straight. If it does, I would say your problem may lay with the freewheel. If it has major wobble, this is your problem. But if it is a chainwheel, your spider may be the issue and not the gear.
Hope this helps.
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TAKE THE GOOD, THE BAD AND THE UGLY AND YOU HAVE LIFE. WELCOME! NOW HANG ON AND RIDE. |
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tsmith
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Location: Freeville, NY
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| Posted: Thu Jul 17, 2008 6:39 pm Post subject: |
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I was thinking alignment between the front and rear sprockets, too much angle??
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AirportFF
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Joined: 30 Jun 2007
Posts: 427
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| Posted: Thu Jul 17, 2008 8:44 pm Post subject: |
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How old is the chain? Also freewheels are basically a disposable item. You might want to replace both.
I put a White Industries freewheel on Matt's bike a while back. Runs nice and smooth and is 100% rebuildable.
One other thing. When you spin the cranks does the chain get tight in the same spot on the front sprocket with every revolution. If so, the problem lies with the sprocket and not the chain. If they are profile sprockets the center washer that adapts it down to the spindle size may be worn also. This allows the sprocket to move around on the spindle causing severe tight spots.
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AirportFF
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| Posted: Thu Jul 17, 2008 8:46 pm Post subject: |
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drimmdee
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Joined: 07 Nov 2007
Posts: 16
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| Posted: Fri Jul 18, 2008 9:02 am Post subject: |
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Thanks for all of the help.
I picked up a profile sprocket last night. This should do the trick. |
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