Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Mentioned: 6 Post(s)
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I was tempted to respond by saying "of course it won't pedal, you have to pedal it yourself" but moving past, I that figure I'll actually try to help.
Crank arms are attached directly to the chainring spider so they turn together. But some designs have the right crank and chainring assembly made in two parts and attached with pressure. These can let go and the remedy is a new right crank.
There's also the possibility that your bike had front freewheel, (when you back pedal the chain doesn't move). If that's the case it might be salvageable with a solvent flush, but the odds are about 3:1 against and you need a new crank. Problem is front freewheel cranks aren't around any more so the repair will be more complicated.
From your post it sounds like this is foreign to you, so step one will be to visit a local shop for a consult.
An ounce of diagnosis is worth a pound of cure.
“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin
“One accurate measurement is worth a thousand expert opinions”
- Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance