Dual Road and Gravel bike

Sounds good. I’m more of a 53/54 : (

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Do you know the ID or OD for the shim? Also looking at McMaster-Carr.

I have a Giant Revolt with a 2x chainring. This bike is pretty snappy. It may not be the best option for crits but I can keep up with any A ride in my area on 700x40 tires that have a fairly slick centerline.

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https://novemberbicycles.com/products/centerlock-hub-rotor-shim-pack-of-4

This is the link. According to my measurements.

I believe the ID is 35mm and OD is 47.5mm.

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I have a Ribble CGR ti in full Ultegra R8000 di2 11Speed with Hunt 40s 700x30c. I’m planning to do a gravel event like the Dirty Reiver. I want to Switch out the rear derailluer for GRX one and the chain rings from 52/36 to 46/32? I just wanted someones opinion on this.