S-works carbon road cranks problem

[blind76]

Hi all

when I look from above I can see some lateral movement of the chainring at the same part of the crank revolution (opposite side of the crank). It is not big but I can see it.
It is a new bike and every bolt is tight and there is no play anywhere.

Is this normal?

[alcatraz]

So the chainring is warped or the spider is.

First you need to figure out if it's one or the other, or both. You can put the chainring on a flat surface like a sheet of glass. See if you can wobble it sideways.

If the out of true is only very slight I wouldn't bother. But yes I understand if it's new it shouldn't be. None of my bikes are new or nearly new so I'm speaking from a practical point of view.

If it's the spider you could either warranty it or try to shim it/bend it (alloy spider). First locate the arm that is misaligned by using a ziptie or some sort of gauge that you can position to barely make contact, then compare the 5 spider arms.

Sometimes the chainring teeth bend in a small section, often when handling the bike without wheels and putting it down etc.

[elfuinha]

Check the spider...

When i bought my crank the spider wasn't ok.

lucky Specialized Send other crank by mistake, and i manage to have a good spider, that i ended replacing by a Quarq spider.

[blind76]

Can you check is this movement normal?
https://drive.google.com/file/d/1XDE4YS ... y7q06/view

[elfuinha]

Check the smaller ring when you rotate the crank in the video, it's offcenter like the big ring.

Check the spider.

[blind76]

Hi

yes, it is, both of them are off center.
Is there anything to do or I need to change the spider?

[elfuinha]

i replace the Spider, and solved the problem.

If it's in warranty... go that way