Carbon Wheels - Brake Track Wear

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Dannnnn
Posts: 9
Joined: Wed Apr 04, 2018 1:00 pm

by Dannnnn

I recently bought a pair of Cosine 45mm wheels off another forum (Sold as "as new")
So far they have been great and I really like them.

Last week I went out and got caught in the rain. When I got home I saw that both wheels were covered in a white powder/solution.
I assume that this was where the resin has been wearing away whilst braking in the wet (like aluminium rims shed black powder/liquid).

So the next day I cleaned them and upon inspection of the brake track they look like the pics below in places.

My question is how badly worn do these look?
I read that when you start to see the carbon weave that they are almost done.

I only weigh 70kgs, the bike is 8kg and I'm using the Cosine supplied Carbon pads. I've been very careful with how I brake on them so I don't create too much heat (not that I do much braking on my training routes)

Thanks

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sungod
Posts: 1566
Joined: Fri Dec 24, 2010 9:37 pm
Location: it's raining, it must be uk

by sungod

is the brake track deeply worn? i.e. concave or 'rutted', you should be able to feel this by running your fingers over the surface

generically, wear is not as simple as being able to see the weave - with some you can see the weave in brand new unridden wheels, and the weave is a normal part of the braking surface

if you're concerned, try contacting wiggle and see what their advice is for assessing wear

by Weenie


guyc
Posts: 449
Joined: Thu Mar 24, 2011 9:40 am
Location: Hampshire, England
Contact:

by guyc

That looks like they’ve scored. Something caught between pad and rim?

kode54
Posts: 1213
Joined: Tue May 23, 2006 9:39 pm

by kode54

grit on the road act like sandpaper on carbon. some rims wear more than others.
- AX Lightness Vial EVO D + DA9150 + Enve SES 4.5 carbon hubs
- Parlee Altum + DA9150 + Enve SES 4.5 carbon hubs
- Parlee ESX + DA9150 + THM SRM PM + Enve SES 6.7 CK hubs
- Guru Praemio R Titanium + DA9150 + Enve 3.4 CK hubs

Dannnnn
Posts: 9
Joined: Wed Apr 04, 2018 1:00 pm

by Dannnnn

sungod wrote:
Mon Apr 30, 2018 5:19 pm
is the brake track deeply worn? i.e. concave or 'rutted', you should be able to feel this by running your fingers over the surface

generically, wear is not as simple as being able to see the weave - with some you can see the weave in brand new unridden wheels, and the weave is a normal part of the braking surface

if you're concerned, try contacting wiggle and see what their advice is for assessing wear
Nope, the brake track is still smooth. There is a slight groove in them but it's not massively noticable.

I'll give wiggle a shout and see what they say.

alcatraz
Posts: 974
Joined: Mon Aug 29, 2016 11:19 am

by alcatraz

Were the brake tracks much less scratched before the ride in the rain?

Seems like you have a lot of debris in the pads. Better clean them out and reduce your rain riding.

You might also choose a softer pad. Take care when choosing though as many pads aren't suitable in the wet.

Is it possible the pads themselves are very abraisive? That would significantly lower the rim life span.

How about barradine blue. Oz cycle on youtube recommends them, affordable all weather pads. His rims passed 20.000km with those pads.

/a

wingguy
Posts: 3974
Joined: Thu Mar 08, 2012 11:43 pm

by wingguy

Dannnnn wrote:
Mon Apr 30, 2018 11:22 am
I read that when you start to see the carbon weave that they are almost done.
Where did you read that? It’s impossible to make a generic determination like that across multiple brands of wheel. It may or may not be true of some wheels (though tbh I’d be surprised if it held for any) but as mentioned above, there are huge differences in the way braketracks are made.

Some manufacturers actually machine away the external resin layer to leave the carbon threads exposed from day 1, as it provides a grippier surface.

by Weenie


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