Brake caliper and Spokes
the 4 piston calipers are ussually widder for ovius reasons, also most of them are use on cast type wheels with narrower "Spokes" or use on motard aplications were the smaller wheels make for far less vertical spokes ergo they are farder from rotor making the wide caliper a possibility..
what you need for the 950 is a rework,,machine whatever you want to call it to achive this room. you can also get a really big rotor to place the caliper higher on the angle of the spokes but then you losse all the gyriscopic advantage since the rotor end up being super heavy,,specially when is moving..
thanks mack for the information