the underslung is the best choice on the tire/wheel changes these days. You put a spring in the pin to pads and this helps to keep the pads apart, then the brake rotor will just drop right in and you are lined up with the swing arm so the axle can be inserted really fast.
The torque debate of how it applies the energy into the swingarm is yet again one of those well debated subjects. Does it lift, or does it squat is always the question. The CoG is like you indicate, MotoGP level of maybe it helps.
The K67 stock is not bad to get the caliper in and out of the swingarm / inner wheel area compared to the K46. The K46 was a nightmare if you are in a rush. The underslung is the only way to go on it. K66 is just an improvement to the K67.
Yeah, on the older bikes the caliper always seemed to be in the way, and even if you pushed the pistons back in their bores all the way to help (as I did) the pads always seemed to tilt just enough to be a PITA. If they've got a better solution for that, then that's awesome.
Guess I never followed the designations, what is a 2015-2018? K67?
I wasn't buying the CG thing, it would be completely unnoticeable. There simply isn't enough mass there to make a difference, and when rolling a bike into a turn you're always mostly fighting the centrifugal force anyway. It's like a fighter aircraft in roll (as opposed to pitch and yaw), you want all the mass about the centerline.
I remember there was great debate over the years as to where was the best place to put brake torque. Considering the rear axle is always below the swingarm pivot, the bike is always going to want to squat upon applying rear brake no matter what you do because the bike's longest wheelbase is when the rear axle and swingarm pivot are in a plane parallel to the ground. Essentially, it's like a string being pulled taut. You could always have a lever from the caliper to a point on the frame ABOVE the swingarm pivot to use brake torque to counter squat, but that gets kinda hokey and complicated. Riders are USED to squat on the rear brake (I use it lightly in some turns to tighten my line), and I'd say it actually helps in hard braking by lowering the CG. I remember that rider feel was a big issue with alternative front ends on motorcycles, that even with the fancy front suspensions that tuned out dive, so "theoretically" the bike would be better, riders didn't like it and hated the feel, and were actually slower.
hopefully it won't leak.
