Bicycle Mechanics - 1970 Schwinn Sprint rebuild
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06-15-12, 06:27 PM
I am new to rebuilding bikes. I ride a new mountain bike but have never worked on an old one. Is this schwinn supposed to be able to free wheel? Right now if I turn the back wheel the pedals turn.
It sat in a garage for 30 years or so but its functional in all other aspects. Gears change brakes work, sort of. Just the free wheel has me confused.
06-16-12, 02:43 AM
If it has multiple gears, it's almost certainly supposed to freewheel. Fixed-wheel bikes with gears are very, very uncommon (there are a handful of internal hub gear systems that let you do it). I'd imagine the freewheel is gunked up with old oil/grease. Is it an internally geared hub or does it have multiple sprockets on the outside of the hub?
06-16-12, 02:58 AM
The cluster of cogs on the back wheel is called a "freewheel". Yours is all gunked up. New ones aren't too expensive but it takes a special tool to take off the old one.
If you feel like you hve nothing to lose you can try to take the old one apart but I don't recommend it. The freewheel is full of real little ball bearings and itty bitty springs.
06-18-12, 10:33 AM
Thanks fellas. I will try to grease it up. It was sitting in a garage for 20 years, so I hope its just a little grease needed. I will maybe use the yellow bike peeps we have here in Austin if needed.
06-18-12, 10:55 AM
DO NOT grease it up or take it apart - greasing will not remove old grease that is hardened, and disassembly is out of the question - time intensive, likely to lose bearings or parts. Best to have a shop remove the freewheel (don't remove any guards or spacers underneath the freeewheel). Dunk it in solvent and spin until it runs free, then just follow Sheldon's lubrication advice: http://sheldonbrown.com/freewheels.html and reinstall it if it now works OK - no tool required, just carefully screw it on. (handy hint - turn it counterclockwise until it seats into the entry threads, then clockwise til it stops. Riding will tighten it.
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