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Centerline X rotor shape

Posted: Wed Sep 26, 2018 6:43 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

Centerline X rotor shape

Posted: Wed Sep 26, 2018 6:43 pm
by Weenie

Re: Centerline X rotor shape

Posted: Thu Sep 27, 2018 8:31 am
by TobinHatesYou
Looks like it’s time to learn how to true a rotor.

Re: Centerline X rotor shape

Posted: Thu Sep 27, 2018 11:37 am
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 :)

Re: Centerline X rotor shape

Posted: Thu Sep 27, 2018 11:43 am
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.

Re: Centerline X rotor shape

Posted: Thu Sep 27, 2018 12:13 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!

Re: Centerline X rotor shape

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

Re: Centerline X rotor shape

Posted: Fri Sep 28, 2018 11:14 am
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.

Re: Centerline X rotor shape

Posted: Fri Sep 28, 2018 1:30 pm
by jfranci3
Just checked. Flat. Your rotor probably saw some heat along the way. It’d probably fix itself, but after some noise.

Re: Centerline X rotor shape

Posted: Fri Sep 28, 2018 2:41 pm
by Svenner
Thank you :)

Re: Centerline X rotor shape

Posted: Fri Sep 28, 2018 2:41 pm
by Weenie

Re: Centerline X rotor shape

Posted: Fri Sep 28, 2018 3:35 pm
by Nefarious86
It wont self align. It's a defect.