I'll repeat the same measurement and also check the pad area. All I can say it that the change does
make a noticible difference (rode in today). I am still working through a slight ridge that the stock set-up left at the top of the rotor where the stock pads didn't touch, but that is mostly gone this morning!
I suspect that the different sized bores for the Nissin pistons makes a difference as well in the "feel" component of this change.
Let's see what my measurements say!
Originally Posted by Steve Pickford
I considered fitting a Nissin 4-pot to my airhead GS until I measured the diameter of the Nissin caliper, worked out the surface area & found that the two large diameter GS pistons had a greater surface area than the Nissin caliper (off a GSX-R750/1100).
It could be though that Nissin pads have a greater pad area?