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Old Rims - Compression(4 posts)

Old Rims - CompressionFred the Cross-Poser
Aug 9, 2001 6:18 AM
Hey folks -

Have any of you experienced rim compression? I have this 20 year old high mileage wheel with an Araya rim and I can't keep tires on it. It has seen countless spoke adjustments through the years, including by me back in high school when I had no clue what I was doing.

Is it possible that the rim has compressed to the point where its circumference is significantly smaller?

Is there an easy way to check this?

Thanks in advance!
re: Old Rims - Compressiongrzy mnky
Aug 9, 2001 3:20 PM
More likely you've worn the "hook" of the interior channels. It gets really hard to hold modern high pressure tires that require the hook feature if it's not there.

I'd say it's time to treat yourself to a new rim, maybe even splurge and get the spokes an nipples too! It's gotta be costing you a small fortune in shredded tubes.
Going through changesKerry Irons
Aug 9, 2001 5:13 PM
Tire and rim technology have progressed a lot in the past 20 years, and evolved together. More aggressive beads on tires, deeper hooks on rims, and higher pressures on tires. Think back - what was the pressure rating of the tires 20 years ago? Also, think about all the problems people were having with the early high pressure clinchers. As suggested, you may have experienced some wear of the inside of the rim, but more likely this isn't much of a rim (by today's standards). You certainly did not compress the aluminum, although if there are any dents in the sidewall, this would also make it harder for the tire bead to "hang on" to the already substandard hook. You've gotten your money's worth out of a 20 year old rim.
Compression, I doubt it, more likely...club
Aug 12, 2001 9:28 AM
...they weren't made back then to retain today's silly super-high pressure clinchers. Nobody was running 160 psi clinchers back then so the fit could be looser, and changing tires was much easier. Old Mavics tended to fit loose. Ironically, they fit loosest with their fellow-French-made Michelins, which often wouldn't stay on the rims.