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The Crux frame is compatible with 140 or 160 mm rear rotors and uses the flat-mount standard. The Crux fork is designed for 160 or 180 mm rotors. It uses the normal flat-mount bracket, which is set in the "low" position for 160 mm rotors.
The Hopes have the adapter built in, and default +20 (high) so when combined with a fork mount that is designed to be low by default it equals 180 rotors.
@snoops PM inbound.
@infmz believe the + simply denotes a few tweaks vs the original RX4, with the main one being the angle which the hoses exit the calliper after feedback from the masses.
I have a ‘normal’ flat mount which required adapter and a front flat mount which includes adapter built in but in the ‘high’ setting - they are obviously designed for 140mm forks to be run in a 160 config.
I’m fat, but I’m on the cusp of the 180 recommendation. Humph.
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yeahdext
@hippy
Don't they usually spec a max size? Could the bigger disc create more bang crash explosion?