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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 02-23-07, 11:54 AM   #1
bigmallard
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Free Spinning Pedals

Ok here goes, I have a seventies or eighties Panasonic Villager III road bike that I am fixing up and using as a commuter bike. It has a Shimano Positron II system. The weird thing is, is that it has a front freewheel. While I am coasting the chain continues to move, because the front crank rotates. A few days ago the front Freewheel locked up, so when I would coast the chain got tight on the bottom and became lax on the top. I took it to a LBS and they guy fiddled with it for a while and it came loose. I live about 3 miles from the UF campus and on my way the pedls began to freespin. By freespin I mean I can turn the pedals and no other parts move, rendering my bicycle an ineffective paperweight. Hopefully you guys can help me, and hopefully it is not too expensive
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Old 02-23-07, 12:29 PM   #2
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1) Front freewheel - no idea what this means
2) Rear freehub is probably toast, inspect and overhaul. If it's old it's probably not even worth saving.
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Old 02-23-07, 12:29 PM   #3
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Sheldon Brown has a bit about the Shimano FFS (front freewheeo)on his site. It might be cheaper to just have a conventional bottom bracket installed. He also talks about positron.
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Old 02-23-07, 12:30 PM   #4
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1) Front freewheel - no idea what this means
2) Rear freehub is probably toast, inspect and overhaul. If it's old it's probably not even worth saving.
FFS was an attempt by shimano to make the chain move when coasting so that you could shift without pedaling.
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Phobias are for irrational fears. Fear of junk ripping badgers is perfectly rational. Those things are nasty.
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Old 02-23-07, 12:37 PM   #5
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Quote:
Originally Posted by jsharr
Sheldon Brown has a bit about the Shimano FFS (front freewheeo)on his site. It might be cheaper to just have a conventional bottom bracket installed. He also talks about positron.
Unless this OP has a standard rear freehub/freewheel they'll have to get a new rear wheel to boot.
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Old 02-23-07, 01:01 PM   #6
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No, it has a stationary rear hub, and it sounds like this is getting more expensive by the minute
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Old 02-23-07, 01:08 PM   #7
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FFS was an attempt by shimano to make the chain move when coasting so that you could shift without pedaling.
Another solution in search of a problem
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Old 02-23-07, 01:09 PM   #8
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Could always replace the crank, ditch the positron and go fixed
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Old 02-23-07, 01:39 PM   #9
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Could always replace the crank, ditch the positron and go fixed
Doesn't work. There's a safety built into the "fixed" gear cluster that will release it under a certain amount of stress, so if you tried to resist the forward motion, or skid, it would just start spinning. Even if it wasn't like that, it would probably just break anyway, since it's not designed to handle that sort of load.
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Old 02-23-07, 02:45 PM   #10
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Does anyone know where I would be able to get replacement parts, I can't seem to find any
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Old 02-23-07, 02:53 PM   #11
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They'll be uncommon, and out of production - best bet is Ebay... but I'd probably look instead for another vintage bike - easier to find
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