I've searched for posts about "bent rims", but none of the threads I've looked at have seemed to really address my problem.
I have an old Univega Gran Turismo I'd like to fix up. All that's left of the front wheel is the hub and the rim; I don't know what happened to the spokes. I'd like to build a new wheel with what I've got, but since I've never worked on a project like this before, I'm kind of lost.
What concerns me is the rim. When I laid it on the ground, it didn't lie flat. Two sides touched the ground, while the other two went up in the air a bit. It's kind of like a pringle shape, though the bend isn't nearly as dramatic.
I tried to bend it flat (I don't know if this was a good idea), and it's helped a bit, but I still don't think the rim is perfectly straight and true.
Is this normal? Can I rebuild this wheel using this rim? Will the spokes bend the rim into shape, or will it cause the wheel to go out of true?
The rim is junk. If you do happen to pull the rim into true with spoke tension, the tensions (which are all supposed to be very close to equal) will be so far out that the wheel won't last.
If there are no kinks or cracks in the rim you may be able to straighten it. It really depends on the condition of the rim and it's hard to make a judgement call without seeing it. It will need to be good and straight and round before attempting to rebuild it.
A replacement rim may make more sense.
cycles per second
I rebuilt a wheel with a slightly bent rim. I straightened it as much as I could first but the best I could get it still had it a few mm off. The wheel has been working fine for > 20 years.