Tim, do you have the spacers on your website??View attachment 79592
Is it required? No
Should you use it? We think so.
When we ran through the set up of the kit we determined and verified there was an offset issue with the swap.
The shim centers the caliper over the rotor so typically the pistons are retracting equally from the rotor surface.
For the 32mm rotors either OEM or Girodisc, just allows the calipers to function in a more centered position. Plus we offer the 1mm thicker pads in R12 and R18 from G-LOC which keeps the pistons more in their designed sweet spot.Are the shims recommended if you're just running gt500 rotors? Or is that more for the 2 piece setups?