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@CoconutCrab
Thanks @Netakure my idea was basically to make a 40-30 (yeah i know but it's relevant for my riding on 9 speeds), so with a road 40 as GRX doesn't offer this size (30 inner exists as GRX so shoulnd't be a problem). Seems i'll turn to good old TA as the cheapest + lightest option for unusual pairing. Thanks @BrickMan didn't know about these "marks", makes sense as brands would rather sell new rings that maintain compatibility unfortunately.