Originally Posted by Michel Gagnon
- Maybe others had them, but the Weinmann Concave rims had no hooks. It means maximum tire pressure was around 50-70 psi. If you try a modern tire at 100-120 psi, it's likely the bead will get off the rim.
Not completely correct. I have them on my Raleigh Competition and on my fixie. I use wire bead tires and regularly run 115 psi. I wouldn't use folders at any pressure on a non-hook rim. Just make sure that you don't have any rim strip lapping up on the inside of the rim where the tire bead sits. They were the original rims that came on my Raleigh and the tires on it the day I got it were over 100 psi. I know because I'm the original owner.
These are very strong rims. Sheldon Brown I believe said it was the only rim that he could ride with a flat tire and not worry about hurting the rim. They are a pain to keep clean and shiney however.