CMP wheel details

[sapper740]

Originally posted by Hanno Spoelstra
Didn't we find out, due to Mike Kelly's measurements of 9.00 X 16 U.S. versus British wheels, it isn't so much a case of the 0° versus 5° degree bead angles, but the considerable difference in bead diameter?

Quite so. I recommend trimming a 1/16th of an inch or so from the bead of any U.S. 9:00 X 16 NDT tire installed on a CMP rim. I didn't and have already learned to regret it. The tyres on my C15 had been replaced long ago by Goodyear 9:00 X 16 NDT's. When It came time to replace those tyres, I couldn't remove them from the rims. Taking them to a tyre store didn't help either. Their bead breaker was useless against the relentless grip of the NDT's on the rims. Finally I had to cut as much of the tyre away as possible, and then burn away sufficient rubber to get access to the cable embedded in the bead and labouriously cut through it. Once the cable was cut, the tyre was easily removed. I sand blasted, primed and painted the rims and installed the new tyres, using a solution made from vegetable oil soap. not silicone as per manufacturer's recommendations to ease installation. I didn't trim the bead as the tyres seated themselves nicely with air pressure. A few weeks after installing the new tyres I woke up one morning to find my truck had a flat, so I removed the wheel to fix the tube. I figured being on only a few weeks the tyres should fall off the rims, right? Wrong! Same problem. The bead was solid on the rim and I was thinking "Crap!" how do I get this off to fix the flat. Fortunately, I found that the back half of the rim wasn't stuck and after flipping the wheel over I was able to access the tube. Of course, now I wonder if the other rims have both halves stuck to the new tyres and if I'll be able to repair them should they spring a leak. Next set of tyres, I'll take the time to trim any U.S. made tyres before installing them on Canadian rims.

Lessons learned.

CHIMO!