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Rim Wear when to Replace?(5 posts)

Rim Wear when to Replace?BDBike
Mar 18, 2003 5:43 AM
I have been riding for 3 summers/winters now on the same rims and they are groved and worn. How do you know when to replace them so you don't have a blow out. Are there any tests like over presurizing the tire to test the rim for fatigue and danger of blow out?

-Brett
My not-too-objective test:Spoke Wrench
Mar 18, 2003 5:49 AM
I feel the brake surface with my finger. When it starts to feel concave, I recommend junking the rim.
I've read...mpm32
Mar 18, 2003 6:40 AM
...that you should pump the tires up to 2x the recommended pressure. If they hold, your fine, if not then you'll need to get new rims.
re: Rim Wear when to Replace?Fredrico
Mar 18, 2003 8:53 AM
The sidewalls on most if not all rims are thick enough to go alot more than 3 years. Usually, a rim will start cracking around the spoke holes, get a flat spot from a pothole, or it will warp in a bad crash, way before the sidewalls wear out from braking. Just take some emory paper and sand off the surfaces.

A blow-out might be caused by a spoke-end extending out from the nipple into the tire tube, or a ding in the rim from a crash even, but never from grooved brake surfaces.
Hard to wear out the side wallsKerry
Mar 18, 2003 5:39 PM
Unless you are riding a lot in wet & dirty weather or constantly heavy braking down big hills, it's very unusual to wear out a rim's side walls. I did this on my commuter, but that's due to year round riding with snow, road salt, sand, etc. and constant start/stop. The rim had over 10K miles on it, was a cheap rim to start with, and was 7 years old.