Jeff,
I classified my #749 as’17 BMW F82 M4 6MT ZCP steel brakes, which is not different from my ’18 build. For the season I’ll be running downgraded 19″ wheels with stock sized RE-71Rs.
TireRack still owes my 19″ rear wheels, so I’ll have all the fun with ZCP 20″/30 series MPPS this Sunday.
See you there!