Carbon Brake Track Scratch
12-05-14 | 10:32 PM
#1
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Carbon Brake Track Scratch
Hey All,
I rode my carbon Dura Ace C50 wheels just a few times and I see some scratches on the brake track ..Two of the scratches appear heavy...
Would continuing using these wheels cause a crack or issue with the wheels?
I rode my carbon Dura Ace C50 wheels just a few times and I see some scratches on the brake track ..Two of the scratches appear heavy...
Would continuing using these wheels cause a crack or issue with the wheels?
12-06-14 | 09:57 AM
#4
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From: Pittsburgh, PA
Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!
Carbon rims are one case where disc brakes are a worthwhile solution from rim damage and brake efficiency standpoints. However the reasons for choosing carbon rims are lighter weight and better aerodynamics. Disc brakes negate both.
12-06-14 | 10:12 AM
#5
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From: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
To answer the OP.
Rim makers have to engineer to allow for wear. While carbon rims are more pone to wear damage than aluminum, this was also factored, so IMO (and without actually seeing it) your wear is well within normal bounds and the rim is still safe.
Try to slow future wear by using pads made for carbon rims, keeping them clean and free of grit, and limiting brake use where it's possible to do so. Personally I wouldn't use carbon rims for urban cycling where stop and go is the norm, but they're fine for open road riding where it's mostly light speed control braking.
Rim makers have to engineer to allow for wear. While carbon rims are more pone to wear damage than aluminum, this was also factored, so IMO (and without actually seeing it) your wear is well within normal bounds and the rim is still safe.
Try to slow future wear by using pads made for carbon rims, keeping them clean and free of grit, and limiting brake use where it's possible to do so. Personally I wouldn't use carbon rims for urban cycling where stop and go is the norm, but they're fine for open road riding where it's mostly light speed control braking.
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FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
12-06-14 | 02:08 PM
#8
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From: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
In any case, you'll know when it's getting too deep by seeing visible fraying of the carbon with some fuzzy strands hanging loose. Even then the rim will still have structural integrity, but cutting into the fabric plies themselves in an indicator that it's getting serious.
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FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
12-06-14 | 07:55 PM
#9
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Well, that's easy. Embed a small stone in the shoe and keep riding.
In any case, you'll know when it's getting too deep by seeing visible fraying of the carbon with some fuzzy strands hanging loose. Even then the rim will still have structural integrity, but cutting into the fabric plies themselves in an indicator that it's getting serious.
In any case, you'll know when it's getting too deep by seeing visible fraying of the carbon with some fuzzy strands hanging loose. Even then the rim will still have structural integrity, but cutting into the fabric plies themselves in an indicator that it's getting serious.
But thanks for the heads up
12-06-14 | 08:16 PM
#10
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Looks like you are using brake pads meant for aluminum brake tracks. If so, that is a no-no. Use pads recommended by Shimano for carbon brake tracks.
12-06-14 | 09:08 PM
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