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Carbon Rims...(4 posts)

Carbon Rims...SandiaSS
Jun 17, 2002 3:09 AM
This may seem goofy, but I want to build the lightest tubular 'cross wheels I can, and was wondering about the carbon rims offerd by Zipp or LEW. I plan to use these only for racing and intend to use Tune hubs with Sapim CX-Ray spokes, built by Gravy.
I'm not really concerned with strength as I'm rolling on 20 hole mountain wheels on my single speed right now with no problems, and 28 0r 32 hole 700C wheels should do great under me.
I'm more concerned about braking in the wet & mud. I live in New Mexico, but will do most of my racing in Colorado (if the whole state doesn't burn down) as there isn't much 'cross in NM.
I'm doing it!Jan Gerrit Klok
Jun 20, 2002 2:50 AM
Zipp 58mm high 370g rims, 24h front, 28 rear, silver CX-Rays around Tune hubs, 1305g and incredibly fast. I weigh 83kg and they hold up great.

Forget about braking, it's not gonna happen! I'm in the process of trying on Tektro mini-V's with good cartridge pads, see if I can find some actual decelleration.

Right now I lose time under braking and in descends, I hate it!! Everyone speaks of cork pads, but no-one offers them...
I tried both black and yellow koolstops, no power with either.
Corima Brakepadstriangleforge
Jun 21, 2002 8:51 AM
I've never used them (and alas, have never owned carbon rims that require them!), but I know Corima makes a carbon-specific brake pad, though I'd imagine finding a post-style pad holder to fit cantilevers might be a tough trick. Check on:

http://www.corima.com/corima/GB/boutique/accessoires/coffret/produit.html
I recall you mentioned this problem a while back. Have you ridden them in the mud & sand yet? I had a similar problem with a new wheelset (anodized aluminium FiR tubular rims, so this may not apply) -- OK braking with dry rims, NO braking with any water on them at all -- which went away after I rode back and forth through a wet sandpit dragging the brakes for about five minutes to chew off the anodizing. I'm not sure I'd have the guts to abuse a carbon rim quite that badly, but a little scuffing may help.

Good Luck!
Corima BrakepadsJan Gerrit Klok
Jun 22, 2002 9:59 AM
Thanks for the URL. When I tried a few months ago, Corima DENIED to have any special brakepads.
The compound of those pads sounds promising, but I wonder if they'll fit on cantilever brakes.

And yes, I've done some racing on the wheels. They ride okay, just that the braking is ABSENT.

In the pic I didn't use the rear wheel, had a problem with the rear tub I recall, or there was still a Diamond tub on it I didn't trust for the course. Oh wait, the tub wouldn't stick to the rim then, I didn't know I needed so much glue and 2 liners for that.

Pic taken during Sint Michielsgestel Superprestige race last winter. Admitted, no mud there. Only had that at the Zeddam Nationals later in the season.

Cloxxki