To my knowledge. the EX front brakes are larger than the standard LX/DX models. I think it's 8.5", if not, then I think 10.31" is the correct number. I will double check my Helms manual when I get home, on that. But I am positive the thickness is 21MM (or .82"). The rear is 9.4" with .35" thickness

Stock calipers have a weak 1 piston caliper :shocked: and the piston diameter for the front should be 2.12", the rear is 1.19". Talk about weak stoppping power.