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A bigger rotor and a suitable caliper mount adapter would be one way to get the caliper away from the spokes.
This will probably give me the most clearance from the spokes, which can only be a good thing. It also has the advantage of allowing the pads to remain about the centre of the caliper which I assume is good for the even application of force.
Is there any reason why I couldnt use a 180mm disc with a set of spyres?
Is it worth spending more on a floaty whatever or is this one sufficient?
http://www.chainreactioncycles.com/shimano-slx-zee-deore-rt66-6-bolt-disc-rotor/rp-prod82436
root-
Is there any reason why I couldnt use a 180mm disc with a set of spyres?
I don't know Spyres, but most brakes are happy with bigger rotors. You need to find something with enough radial depth to ensure that the pads are contacting brake track and not the supporting spider or, even worse, the rivets or buttons of a composite or floating rotor.
gbj_tester
Would that be a negative shim? IS brakes mount on the wheel side of the fork tabs. Post mount have oval holes, but I'd imagine @root is already at the limit of that adjustment.
A bigger rotor and a suitable caliper mount adapter would be one way to get the caliper away from the spokes.