there's no Shimano standard for combining FM calipers with 180mm rotors.
There are adaptor to allow 180mm on flat mount however this depend on the fork maximum rotor sizes.
Worst case scenario I’ll end up with a larger rotor in the back.
Thinking about having the brake mount replaced. But not sure where my priorities lie atm. Get rolling asap I guess.
Seems Stockholm is Fresh out of gravel carbon forks, so that would be step one I guess.
@nogk started
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There are adaptor to allow 180mm on flat mount however this depend on the fork maximum rotor sizes.