New Rims with Grooved Sidewalls
02-25-16, 10:07 PM
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New Rims with Grooved Sidewalls
I just did my first wheel build using to replace the tubulars on my Raleigh International. They came out great but, now I am concerned about the grooves in the sidewalls. Are they going to chew up my brake pads too quickly? I'm not sure why they left them this way instead of smoothing them out.
Wheels are my original Campy hubs, Sapim spokes and Pacenti PL23 rims.
Wheels are my original Campy hubs, Sapim spokes and Pacenti PL23 rims.
02-26-16, 12:03 AM
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Groovy, baby!
In theory, I think they probably would wear out your pads faster. In theory, the greater surface area should make for better braking, too, once the pads are grooved to match. When I last took my car in brake work though, they recommended I replace the disc rotors because they had some fairly deep grooves worn in them. I couldn't see how the braking was any worse or better, but I did assume the pads would wear faster on the old rotors.
Let us know if this pans out when the rubber meets the road.
In theory, I think they probably would wear out your pads faster. In theory, the greater surface area should make for better braking, too, once the pads are grooved to match. When I last took my car in brake work though, they recommended I replace the disc rotors because they had some fairly deep grooves worn in them. I couldn't see how the braking was any worse or better, but I did assume the pads would wear faster on the old rotors.
Let us know if this pans out when the rubber meets the road.
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02-26-16, 01:57 AM
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those grooves' only purpose is to eliminate brake squeal. they won't make your pads wear any faster, either.
02-26-16, 04:26 AM
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I don't know, but I'll speculate because, after all, what's the internet for?
If your wheel is perfectly round, and the rim grooves wear matching grooves into the brake pads and the matching pairs mate perfectly, then the increased surface area will increase braking power without increasing wear. But if the rim is out of round enough that the rim grooves move up and down relative to the brake pad, then the brake pads will wear faster. The brakes may seem to grip better at places where the grooves run a little oblique.
How much of a problem this might be, I won't speculate. In fact I wouldn't worry about it at all.
If your wheel is perfectly round, and the rim grooves wear matching grooves into the brake pads and the matching pairs mate perfectly, then the increased surface area will increase braking power without increasing wear. But if the rim is out of round enough that the rim grooves move up and down relative to the brake pad, then the brake pads will wear faster. The brakes may seem to grip better at places where the grooves run a little oblique.
How much of a problem this might be, I won't speculate. In fact I wouldn't worry about it at all.
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02-26-16, 04:55 AM
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Brake your MA40s enough in the rain and they'll end up grooved too.
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02-26-16, 01:59 PM
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LarryBSky-
Cool looking rims but be really careful in the wet. The rims will hold water in the grooves and lubricate the pad - rim contact area. Had a truly thrilling ride on a Peugeot with grooved rims a long time ago, it truly accelerated the heart rate.
Cool looking rims but be really careful in the wet. The rims will hold water in the grooves and lubricate the pad - rim contact area. Had a truly thrilling ride on a Peugeot with grooved rims a long time ago, it truly accelerated the heart rate.
02-26-16, 07:01 PM
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Ex Pres-
You win the bet. They were chromed steel with the ripple grooved sidewalls. However, the basic issue is the same since the ripples, dimples, grooves or whatever of a non-flat rim act as reservoirs to feed water to the point of braking contact on the rim. Steel simply makes it immeasurably worse, alloy is slightly better but flat alloy would be best.
You win the bet. They were chromed steel with the ripple grooved sidewalls. However, the basic issue is the same since the ripples, dimples, grooves or whatever of a non-flat rim act as reservoirs to feed water to the point of braking contact on the rim. Steel simply makes it immeasurably worse, alloy is slightly better but flat alloy would be best.
02-26-16, 07:12 PM
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I always thought that the grooves on old steel chromed rims were to work as "siping" to promote draining away of water from the rim wall surface, just like the grooves on tires......
02-26-16, 08:41 PM
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Interesting. I just built that exact same combination of hub/spoke/rim for my incoming Pelizzoli. Box section, nocely polished, a little wider than traditional cintage rims so good for both 25's and larger tires.
Not my first set of Pacenti rims, however, also have some done with DA. No worries, they work fine and I don't notice any grooves wearing in my pads, nor reduced braking capacity in the wet.
Not my first set of Pacenti rims, however, also have some done with DA. No worries, they work fine and I don't notice any grooves wearing in my pads, nor reduced braking capacity in the wet.
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02-26-16, 09:35 PM
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You have the highly coveted Pacenti cooling fin system. 50% more heat dissipation, 30% improvement in braking efficiency, 10% reduction in pad wear and on occasion, you can fly.
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