Bent chainring, is it common?

[tisun]

I just bought and installed Goldix chainring on my RPantahi crankset with Thinkrider powermeter.  However, the chainring isn’t spinning evenly.  I think they are bent.  Do you think it’s acceptable for such uneven chainring?  Is bent chainring a common issue with Goldix?

https://streamable.com/7pmrx4

[Da11as]

It seems both chainrings are bent. If you did not ride them they must have been bent during the transportation, as both are warped in the same place.

[Tijoe]

In your video, they both appear to be out of plane together.  This indicates to me that you might have a bent leg on the spider that holds the chainrings to the crank.
Take of the chainrings off and set them on a flat surface and determine if they are flat or warped.  Sometimes it can be difficult to determine which spider arm is bent.

[Gianpy]

I just bought and installed Goldix chainring on my RPantahi crankset with Thinkrider powermeter.  However, the chainring isn’t spinning evenly.  I think they are bent.  Do you think it’s acceptable for such uneven chainring?  Is bent chainring a common issue with Goldix?

https://streamable.com/7pmrx4

This has already happened to me with the Think Rider, because it has a wide locking ring and the spacer gets pinched at an angle, you need to use a spacer that fits inside the Think Rider.
In other words: the Think Rider must not be in direct contact with the bottom bracket, this is my experience.

[tisun]

This has already happened to me with the Think Rider, because it has a wide locking ring and the spacer gets pinched at an angle, you need to use a spacer that fits inside the Think Rider.
In other words: the Think Rider must not be in direct contact with the bottom bracket, this is my experience.

This might be it.  What type of spacer should I get?  Could you take a photo of your spacer so that I can get an idea?  Should using a different lockring solve the issue?

[Serge_K]

that's clearly out of whack. Either install error, or item problem.
I have very mixed feelings w chinese chainrings. They used to be cheap at c.25 eur for a double, but now they're 45. But they dont last. At 25, i'm ok. At 45, if it lasts 5k km, then i'd rather buy something more robust.

[Greenred]

Had the same with Goldix chainrings. It’s garbage

[jonathanf2]

I'm just checking if this problem has been resolved. I faced a similar issue using a Thinkrider PM and RPantahi carbon crankset. It was driving me nuts that the chainring was slightly rubbing despite numerous FD adjustments. I even swapped the chainring out and the problem still occurred. I then remembered my Thinkrider PM came with a .5mm Easton alloy washer that can placed on the crankset before installing the power meter. That small washer actually fixed the problem. If you still have that washer, I'd try installing it and see if it will solve your problem. Good luck!

[tisun]

Thanks Jonathan.  The ThinkRider PM I bought from Amazon didn't come with a washer at all.  Luckily I have a Sigeyi PM available and use it with RPantahi crankset instead.