Topic: Rear rim manufacturer defect? Is this safe to use?

[markreimer]

I'm working on getting a cb350f back on the road. It's sat leaning against the side of a garage since 1978... On Saturday I pulled the rear tire off the rim as I need to replace the spokes. It had four broken ones! The rim was in good shape, very little rust, but I discovered this very odd bulge on the inside.

The outside of the rim is dead straight. I laid it on a flat surface and put a light inside the rim. Nothing shines out. I also rolled the rim to see if it wobbled over the section in question - still nothing. It seems the rim is perfect other than the inside. Has anyone seen this before? I'm worried about how it would affect the tire seating on the rim. What do you think, safe to use or not?

[DohcBikes]

Lay it on a piece of soft pine with a cloth or leather covering use a hammer and drift to shape it out a little better.

[camelman]

I did much worse than that to my mountain bike a few weeks ago and I just bashed it back into shape with a couple rocks on the trail. I beat the snot out of it the rest of the ride including a number of 4+ foot drops and nasty root/rock sections. Hardtail mind you...  Your rim is definitely repairable. 

If you have a large adjustable spanner, then you might be able to tighten it down on the rim and lever it out while standing on the wheel. If not, then a hammer should work as long as you have something solid behind the outside of the rim.

[754]

Frost damage i think..y

[markreimer]

Hmm frost? That's interesting. Would make sense. I went at it with a hammer and wood blocks. It took quite a lot of persuasion to push back, but I got it about 95% back I'd say. Tire mounted up nicely and the rim is true to within about 1mm


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[PeWe]

Buy a new rim with spokes. One wheel look good will make the other to look as junk. Order 2 rims with spokes....

[markreimer]

Hah, that would be ideal... I have new spokes for both rims, but only re-laced the rear at this point. Rims have under 2,000km on them, so they're still pretty shiney.