105 calipers might be flat mount - not sure (?)
I have RS785 calipers on my Q1D - I believe they are considered to be XT / Ultegra level (?)
RS785 calipers are post mount with straight brake hose fittings - so they are a direct swap and permit use of the existing BH59 brake hose (BH90 is recommended but not required)
the better calipers also permit use of the better (narrow track) rotors and pads (I have RT86 IceTech rotors)
Last edited by t2p; 01-18-23 at 08:42 PM.