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What happens when you overheat a rim?(7 posts)

What happens when you overheat a rim?crestlinefarm
Aug 12, 2003 9:47 AM
I was on an unfamiliar road (translation: lost) and found myself screaming down a steep hill at 40+ mph (kinda fun) until I saw a stop sign obscured by trees. YAAAAAAAAHHHH. I grab both brakes and came to a stop about 10 ft from the intersection; breathing a bit irregular, heart pounding but otherwise physically ok.
However, I've since noticed the front rim "clicking" as I brake and checked the rim and at the weld is a barely visible--but you can feel with your fingernail--separation.
Two questions:
1. Did I overheat the rim which caused the weld to fail?
2. Am I on the verge of a catastrophic rim failure or can I ride it until my new rim is built (50-100 total miles over the next week)?
Probably not,TJeanloz
Aug 12, 2003 9:55 AM
I find it pretty unlikely that you overheated the rim to the point of causing a weld to fail. That much heat would almost certainly caused the tire to fail first. You can locate the weld by feel on almost any rim, you probably didn't notice it until then. It's also possible that there is a metal shard in your brake pad, which is making the weld more obvious when you brake.

Without seeing it, I would say the rim is probably fine. If there are no horizontal cracks on the braking surface, you should be o.k.
Is the rim a Mavic Open Pro???russw19
Aug 12, 2003 10:10 AM
This is a common thing with Mavic Open Pro rims... the clicking at the joints...

Is the rim a Mavic Open Pro???litesp
Aug 13, 2003 1:22 PM
I believe the Open 4 CD's where the last Mavic road rims to be pinned. The Open Pros are virtually the same rim, but they were welded at the joint and machined to eliminate the seam on the sidewall. However, there is still a blip around the outer edge which only affects radial truing.
Its probably the brake padspmf1
Aug 12, 2003 10:39 AM
You can melt brake pads going down a hill real fast and then trying to stop suddenly. The pads get hard and lose their ability to stop you as well. Take a look at them, and possibly replace them -- its only $20 and easy to do yourself.

Like TJ said, it would be pretty unlikely your rim got that hot without melting (blowing out) your tire.
Don't have to replace the padsKerry Irons
Aug 12, 2003 4:55 PM
Probably can just give them a light sanding to remove the glaze layer, and pick out any grit. Should be good as new, though a little closer to worn out.
re: What happens when you overheat a rim?Crankist
Aug 15, 2003 10:29 AM
I had the same (really f'ing annoying) OP clicking problem after a wet ride. A single drop of oil at each nipple where it enters the rim cured it - and saved me from tumbling deeper into insanity abyss.