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By +20, do you mean that you bought too 'front' RX4+ callipers? I have the non+ versions, one front flat mount (longer), one rear flat mount (shorter) - neither need an adapter as it's built in - and was running 160mm rotors on my Diverge.
Hope have a rotor size to rider weight + bike chart, and for gravel they suggest 180 front and 160 rear for the well fed chaps and defo shouldn't look out of place.
People of Gravel. I have a problem, and as forward thinking bike riders I need your opinion.
My Hope RX4+ Flat Mounts are the +20 variety, which looks pretty and does away with an adapter. Now this wasn't an issue on my SL7 which was obviously 140 standard. But the issue is my Crux is already +20 and thus 160 standard.
So what do I do? both options will cost the same.
For reference: I'm a little fat and it's hilly round here, so a 180mm disc would not be insane and I don't think it would be too out of place on a 61cm frame either.