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Absoluteblack oval chainring doesn't completely fit GRX crankset

Bicycles Asked by Stanislav E. Govorov on July 2, 2021

I’m trying to install an absoluteblack oval chainring on a GRX FC-RX810-1 crankset.

After assembling and tightening the bolts I noticed there’s a gap between the chainring and the crankarm.
Basically, only 1 out of 4 bolts puts the chainring totally flush, the other 3 have about 1mm gap (see the photos below).

I’m wondering is this acceptable or should be considered a defect?

Thank you.

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2 Answers

Thanks everyone for your help, this indeed doesn't look normal. I ordered a wolftooth oval chainring instead. It has no threads in the bores and fits perfectly.

Correct answer by Stanislav E. Govorov on July 2, 2021

For future reference, these particular chainrings will fit just about any Shimano 4 bolt EXCEPT the GRX. They mount a bit strange compared to many chainrings as you can see in this image, the bolt comes through the crankset from behind and screws into the chainring.

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Compatibility

Shimano Dura-Ace 9100, R9120, R9150 & R9170 Di2, Ultegra 8000, R8020, R8050 & 8070 Di2., >105 R7000, R7020, R7070, Dura-Ace 9000, Ultegra 6800, Shimano 105 5800, Tiagra 4700 ; 10 >/ 11 / 12spd compatible. In short ALL Shimano 4 bolt cranks except GRX.

Chainring has 1.5mm offset towards frame for perfect chainline.

Source: Absolute Black

Answered by Nate W on July 2, 2021

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