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Old 10-01-08, 02:08 PM   #1
Synonymous
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pedal won't turn back wheel

Ok, so I've got a mountain bike that's been sitting on my back porch for quite a while, now that I want to finally use it, I can't. When I turn the pedals forward, the pedals move, but the chain doesn't rotate at all.

Here's an example of what type of chain system it has:
http://felixwong.com/news/wp-photos/...ycle_chain.JPG

Not the same type of bike, but the chain system is identical.

Anyone know what might be wrong?
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Old 10-01-08, 02:33 PM   #2
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Do the chain rings go around when you pedal (chainrings are the big front sprockets)? If they do, the chain is not on a chainring. It is either between the rings or it has dropped off the inside. Manually move it to the closest ring and see if that does it.

If the chainrings don't rotate when you crank the pedals we will need real pictures.

After you get past this issue, you really need to service the bike (lube and clean it up as well as adjust drailers, shifters and brakes.
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Old 10-01-08, 07:14 PM   #3
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Quote:
Originally Posted by Synonymous View Post
Ok, so I've got a mountain bike that's been sitting on my back porch for quite a while, now that I want to finally use it, I can't. When I turn the pedals forward, the pedals move, but the chain doesn't rotate at all.

Here's an example of what type of chain system it has:
http://felixwong.com/news/wp-photos/...ycle_chain.JPG

Not the same type of bike, but the chain system is identical.

Anyone know what might be wrong?
If the chain doesn't rotate but the crank is spinning then the chain isn't on the chainrings. I think it's obvious, what the solution is.
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Old 10-01-08, 08:16 PM   #4
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Well the chain is on the chainrings right, I can turn the bike over and rotate the pedals and the back wheel and chain will rotate like normal. But when the bicycle is in an upright position, only the pedal will move.
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Old 10-01-08, 08:20 PM   #5
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Well the chain is on the chainrings right, I can turn the bike over and rotate the pedals and the back wheel and chain will rotate like normal. But when the bicycle is in an upright position, only the pedal will move.
So, does the chain turn the cassette in the back? If so, your freehub is hosed and you will need a new rear wheel.
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Old 10-02-08, 05:56 AM   #6
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I smell a troll. The OP says it's a mountain bike, but post a pic of a road bike.
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Old 10-02-08, 05:58 AM   #7
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I smell a troll. The OP says it's a mountain bike, but post a pic of a road bike.
Read it properly. He said it wasn't the bike, he said it was a bike using the same driveline components..
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Old 10-02-08, 06:19 AM   #8
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Well the chain is on the chainrings right, I can turn the bike over and rotate the pedals and the back wheel and chain will rotate like normal. But when the bicycle is in an upright position, only the pedal will move.
This was asked already, but do you really mean the chainring (the rings attached to the right feet pedal) doesn't rotate either when you turn the pedals?

I would imagine the chainring rotates, but the chain doesn't move (just jumps in place). But I'm not sure from your description.

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Old 10-02-08, 11:23 AM   #9
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could be cheap cranks that have the chain ring on a splined hole mouted on the crank arm
the splines sometimes loosen off,
I have taken the crank arm off and hammered it together.
but its probably better getting a new crank
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Old 10-02-08, 12:05 PM   #10
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Originally Posted by Synonymous View Post
Well the chain is on the chainrings right, I can turn the bike over and rotate the pedals and the back wheel and chain will rotate like normal. But when the bicycle is in an upright position, only the pedal will move.
Are you turning the pedals "backward"? On most bikes, the wheel will only turn if the pedals are moved forward.
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Old 10-02-08, 12:17 PM   #11
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In the picture you posted there are five bolts to connect the crank to the chainwheel. I suspect you actually have a one piece crank. Do the crank and pedals actually look more like on this picture, where no connecting bolts are visible?

http://www.firstflightbikes.com/_borders/BajaFder1.jpg
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Old 10-02-08, 12:32 PM   #12
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wait-- pedals rotate
cranks turn
bagels toasted with cream cheese and a shot of southern comfort in the morning.................
what is a troll? should I use a torque wrench for this? at what "suggested"setting... thanx.....
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Old 10-02-08, 03:14 PM   #13
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bike on it's wheels; spin pedals and crank (forward) and they turn and drive the chain, then it sounds like a dead freehub. if its a freewheel, then you can just spin it off and buy a new one. should probably replace your chain too, cuz its best to do them in pairs.
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