This is a special bundle option exclusively available from RB for those who don't use their brakes for heavy tracking, the front rotor is 390x32 (vs. OE's 390x32.8) which can shed un-necessary extra 2.3 lbs per rotor vs. 34mm* rotor
*32.8mm is the original OE thickness but aftermarket made it to 34mm.
We believe 32mm thickness is more than enough for street and spirited driving, as we have the same size (390x32) of rotor for Corvette ZR1 iron conversion which was heavily tracked with good result both in performance and durability.
This kit is for a direct bolt on installation like OE w/o requiring any modification.
XT910 is an excellent street compound that generates minimal dust, provides quiet braking and excellent modulation.
Rotor Weight Comparisons:
Two-Piece Rotor Kit w/ Pads for Nissan GT-R R35 2012+