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Old 05-21-12, 02:37 PM   #1
ward5110
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Chain and Gear Problems - Please Help!

Hi, I recently bought a second hand bike and got it home and found the following problem. I was wondering if someone could point me in the right direction please?

1. I can't seem to change gear at all (presume that this could be that I need to tighten up the gear cables?)
2. Whenever I stop pedaling to free-wheel, the chain makes a crunching noice and then goes completely slack. If I start pedaling again it eventually gets back onto the cogs.

Any advice or pointers would be extremely useful. I am a complete newbee at cycling but would like to have a go at fixing it myself if I can, just for experience.

Many thanks,

ward5110
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Old 05-21-12, 03:08 PM   #2
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Not enough info to diagnose. The shifting issue could be a shifter problem, a cable problem, or derailleur problem. On the freewheel issue, need to know what kind of hub it is (freewheel or freehub)? Could be the bearings in the hub are seizing or the inner workings of the freehub or freewheel (pawls,etc) are gummed up. In any event, seems like the bike could use a complete overhaul; assuming its worth the 150-200 bucks that would cost.
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Old 05-28-12, 10:20 AM   #3
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Not enough info to diagnose. The shifting issue could be a shifter problem, a cable problem, or derailleur problem. On the freewheel issue, need to know what kind of hub it is (freewheel or freehub)? Could be the bearings in the hub are seizing or the inner workings of the freehub or freewheel (pawls,etc) are gummed up. In any event, seems like the bike could use a complete overhaul; assuming its worth the 150-200 bucks that would cost.
Thanks for the response! Probably easier to get a new bike in this instance!
Cheers
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Old 05-28-12, 10:30 AM   #4
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The chain and freewheel-cassette are consumables,
they wear and you replace them in normal circumstances.

2 chains to a cassette, if you check the chain regularly,for wear.
1:1 if you don't.
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Old 05-28-12, 10:34 AM   #5
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Close up pictures would help. Sounds like a thorough tune-up is in order.

You can also look here: http://www.parktool.com/blog/repair-help
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Old 05-28-12, 10:39 AM   #6
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If you can't move the shift lever then the cables are rusted. If you move the lever but the derailleur does not move then the cable is too loose. The freewheel is binding, probably grimy/rusted. Both of those problems are indicative of neglected maintenance, so may just be the beginning. Take to to a shop or a friend who's good with bikes to see if it's worth fixing.

Last edited by cny-bikeman; 05-28-12 at 04:47 PM.
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Old 05-28-12, 10:43 AM   #7
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Thanks for the response! Probably easier to get a new bike in this instance!
Cheers
You buy a new car when the old one needs a tuneup?
The last time I had a problem like that it turned out to be the shift cable fraying and breaking inside the shifter.
That was a $7 part.
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