Centerline X rotor shape

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Svenner
Posts: 5
Joined: Wed Sep 26, 2018 6:28 pm

by Svenner

Hello everyone!

I just bought a brand new SRAM Centerline X rotor with 160mm diameter.

What immediately caught my eye after unpacking it, is a concave (cone-like) shape of the brake track plane.
It is very easy to see in the attached picture (red marked light gaps).

Is this normal or should I return the rotor?

This is my first centerlock "spidered" rotor and my one-piece 6-hole rotors are usually flat.

Thank you for your help!

Sven
CenterlineX_bend_1.jpg

by Weenie


TobinHatesYou
Posts: 4033
Joined: Mon Jul 24, 2017 12:02 pm

by TobinHatesYou

Looks like it’s time to learn how to true a rotor.

Svenner
Posts: 5
Joined: Wed Sep 26, 2018 6:28 pm

by Svenner

TobinHatesYou wrote:
Thu Sep 27, 2018 8:31 am
Looks like it’s time to learn how to true a rotor.
If I interpret correctly, this is not normal and your Centerline Xs are flat out of the box?

I am somewhat unwilling to accept "truing before first use" on a brand new rotor. These things are not exactly cheap.

Perfectly truing that amount of bend around the whole brake track is also not easy to accomplish. In my experience, the heat of hard braking will put it out of true again, because of tension in the material which was created by the truing process.

I will contact the vendor and have a look what he says.

Thank you :)

mattr
Posts: 4673
Joined: Fri May 25, 2007 6:43 pm
Location: The Grim North.

by mattr

If the disc is conical/deformed the same all the way round, it's faulty. You'll never be able to true it.
If it's just at those two locations it's either been damaged in transit, or it's faulty.
If it's actually designed like that, actually, no one could be that daft.

Send it back.

Svenner
Posts: 5
Joined: Wed Sep 26, 2018 6:28 pm

by Svenner

mattr wrote:
Thu Sep 27, 2018 11:43 am
If the disc is conical/deformed the same all the way round, it's faulty. You'll never be able to true it.
Hi,

yes, the deformation is all around the rotor. Resulting in an even surface, but cone shaped.
It almost looks like the steel braking ring is too small for the aluminium spider and was forced on it during production, but that doesn't make sense either :noidea:

Will wait for an answer from the vendor and request a replacement.

Thanks!

jfranci3
Posts: 684
Joined: Tue Jul 26, 2016 5:21 pm

by jfranci3

I've got a 140 downstairs, off the bike I can check, but yes it should be 2 dimensional.

Svenner
Posts: 5
Joined: Wed Sep 26, 2018 6:28 pm

by Svenner

jfranci3 wrote:
Fri Sep 28, 2018 2:34 am
I've got a 140 downstairs, off the bike I can check, but yes it should be 2 dimensional.
That would be interesting.

My vendor will replace the rotor. I am curious how the next one will look like.

jfranci3
Posts: 684
Joined: Tue Jul 26, 2016 5:21 pm

by jfranci3

Just checked. Flat. Your rotor probably saw some heat along the way. It’d probably fix itself, but after some noise.

Svenner
Posts: 5
Joined: Wed Sep 26, 2018 6:28 pm

by Svenner

Thank you :)

Nefarious86
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by Nefarious86

It wont self align. It's a defect.
Using Tapatalk

by Weenie


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