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Rim braking surface life- any way to tell when to replace?(3 posts)

Rim braking surface life- any way to tell when to replace?Auriaprottu
Jan 12, 2004 6:10 PM
I recently bought a used geared bike that I'd like to convert to a SS. The rims are 27" and true. I'm interested in keeping the original wheels because I can then (barely) use my short-reach Campagnolo calipers. If I go to 700c, I'll have to use the longer-reach Dia-compes that came with the bike. They're fine brakes, but I'd like to use as much Campagnolo as possible (headset, brakeset, crankset- the hubs/rims are non-Campy). Anyhow, how can I tell if the rims have enough life left to use safely? Thanks in advance.
Most new rims have wear indicators.Spoke Wrench
Jan 13, 2004 10:09 AM
I understand it's due to the German equivlent of the CPSC. Some (FIR) have a groove cut into the outer brake surface of the rim, others (Mavic) have what looks like somebody took a spoon and dug a portion out of the inside of the rim. When the groove disappears or the rim wears through at the "spoon marks," it's time for a new rim.

I don't know how to determine the safety of old rims. I think I might try measuring the width of the rim at the tire bead, then pumping a tire up to 130psi or so and measuring it again.
Most new rims have wear indicators.Woof the dog
Jan 13, 2004 3:45 PM
Or you could take a tire and pump it up to 180 psi (provided it can go up that high), if the rim cracks, its time to replace



P.S. could you post a pic of that spoon thing, I am not totally sure what youa re talking about