I'm looking into a BBK for my G37xS, but unsure about the rotors sizes. I live in the Midwest so I need the rotors to fit my stock 18's in the winter, but at the same time I don't want them to look small behind my 20's. Ive confirmed the caliper clearance will work with my 20's and I'll need spacers for my winter set so that's not an issue.

There standard kit is 330mm (13") but that just seems small. I'm considering 356mm (14") up front and 330mm in the rear. If i run that setup, will the difference in rotor size affect braking performance with the AWD system?

I've searched and searched and haven't found any information, figured I would check would some of the brake guru's on the forum.

 

Rotor sizes won't affect AWD. What you need to keep track of are the piston sizes and that the overall brake bias is kept intact (or very close to OEM), otherwise your traction control will go ga-ga.

If you go with a reputable brake company, they can help you with this.

 

Thanks mike, they told me I would be fine but I wanted to confirm with my our research.