carbon rim

Discuss light weight issues concerning road bikes & parts.
Post Reply
Timmy269
Posts: 205
Joined: Tue Nov 25, 2014 2:34 pm

by Timmy269

I'm prepping my bike for the next season and I have a question about my carbon rims.

Are they gone or can I do another season with them? Is the braketrack wearing out to far, I can feel that it's not flat?

Image
Image
Image
Image

by Weenie


73Bronco
Posts: 38
Joined: Sat Oct 28, 2017 6:57 pm

by 73Bronco

Can't help with your question, but I'm curious. How did you wear them out like that? I read somewhere that with carbon wheels, the brake track doesn't wear like aluminium does.

Sent from my SM-G960U using Tapatalk


Last edited by 73Bronco on Sat Dec 15, 2018 3:13 pm, edited 1 time in total.

User avatar
Calnago
Posts: 8529
Joined: Sun Nov 07, 2010 9:14 pm

by Calnago

They look kinda shot to me. It looks like a braking surface that was bonded to the rim which has worn through versus the brake track being an integral part of the rim itself. I suspect braking isn’t that great at this point? If they were mine I’d be binning them and moving on to something else. But same question as previous poster. What kind of use have they had up to this point?
Carbon will wear the same way as an alloy rim in that eventually there will be a recess, it’s just that carbon is so much harder than aluminum and takes much longer to get to that stage.
Colnago C64 - The Naked Build; Colnago C60 - PR99; Trek Koppenberg - Where Emonda and Domane Meet;
Unlinked Builds (searchable): Colnago C59 - 5 Years Later; Trek Emonda SL Campagnolo SR; Special Colnago EPQ

Timmy269
Posts: 205
Joined: Tue Nov 25, 2014 2:34 pm

by Timmy269

I used them in dry weather with black prince brake pads. The front rim is not so bad like this. I think they have 20 000km or more.

User avatar
mortirolo
Posts: 147
Joined: Mon Oct 24, 2016 10:08 am
Location: EU

by mortirolo

Is it clincher?

2nd pics:
It's probably overheated, because there are some bump on the brake track.
Marco Pantani - Momenti Di Gloria

User avatar
Orlok
Posts: 102
Joined: Tue Feb 07, 2017 12:36 pm
Location: Almere - Nederland

by Orlok

Timmy269 wrote:
Sat Dec 15, 2018 4:46 pm
I used them in dry weather with black prince brake pads. The front rim is not so bad like this. I think they have 20 000km or more.
I think that some alu wheels are much more wear then this carbon rim after 20.000km but it also depends of the hardness of the brake pads they used.
Once comes a time that you'll have a tailwind :D
Pinarello F10 - Ultegra 6800 - Carbonspeed C38 - Tubeless

alcatraz
Posts: 2208
Joined: Mon Aug 29, 2016 11:19 am

by alcatraz

20k flat road is penuts.

If you like fast descents and weigh above average I'd say that wheel has held up well for 20k.

/a

User avatar
F45
Posts: 993
Joined: Wed Jun 08, 2011 6:08 am

by F45

Easy way to check: mount a larger tire and inflate to 2x your normal riding tension. Then let it sit overnight. If it doesn't explode then you're good. Safety factor of 2. Aircraft industry is only 1.5.

alcatraz
Posts: 2208
Joined: Mon Aug 29, 2016 11:19 am

by alcatraz

So you're waiting for a midnight explosion? :rofl:

How about measuring the flex in the sidewalls with and without high pressure? Would that indicate any weakness?

The wheels are becoming more and more dangerous to descend on as they age, but on flats maybe they're ok for another 20k.

Some people weigh nothing and ride only flats. They might jump on the opportunity to buy these rims if you lace new rims on there.

Timmy269
Posts: 205
Joined: Tue Nov 25, 2014 2:34 pm

by Timmy269

mortirolo wrote:
Sat Dec 15, 2018 5:36 pm
Is it clincher?

2nd pics:
It's probably overheated, because there are some bump on the brake track.
Yes, they are clinchers. That on the 2nd photo are more like scratches

Wookski
Posts: 1099
Joined: Tue Feb 23, 2016 5:51 am

by Wookski

If you have to ask then you probably already know. Bin them and move on.

User avatar
mortirolo
Posts: 147
Joined: Mon Oct 24, 2016 10:08 am
Location: EU

by mortirolo

Timmy269 wrote:
Sun Dec 16, 2018 8:28 am
mortirolo wrote:
Sat Dec 15, 2018 5:36 pm
Is it clincher?

2nd pics:
It's probably overheated, because there are some bump on the brake track.
Yes, they are clinchers. That on the 2nd photo are more like scratches
It was new or used when you purchased?
Marco Pantani - Momenti Di Gloria

by Weenie


Timmy269
Posts: 205
Joined: Tue Nov 25, 2014 2:34 pm

by Timmy269

mortirolo wrote:
Sun Dec 16, 2018 11:39 am
Timmy269 wrote:
Sun Dec 16, 2018 8:28 am
mortirolo wrote:
Sat Dec 15, 2018 5:36 pm
Is it clincher?

2nd pics:
It's probably overheated, because there are some bump on the brake track.
Yes, they are clinchers. That on the 2nd photo are more like scratches
It was new or used when you purchased?
I bought them new

Post Reply
  • Similar Topics
    Replies
    Views
    Last post