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      04-04-2013, 01:22 PM   #61
ApexWheels
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Drives: M3
Join Date: Jun 2012
Location: Bay Area

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Quote:
Originally Posted by nmulax View Post
I'm ready to pull the trigger on a set of ARC-8s and PSS tires, but still unsure on a few things.

Love the look of GothM's car here.
I'm on H&R springs too, so assuming the F: 18x9 et42 245/40/18 and R: 18x10 et25 275/35/18 combo would work and won't rub - without the need for spacers or additional camber?
When I install coilovers/camber-plates next year, can I keep these same wheels?
GothM mentioned he uses a 15mm spring pad. Anyone know where can I pick these up?

What length valve stems will I need for the new wheels?
36111095375 / 36146792829 43mm (RDV 001)
36111096449 / 36146792830 48mm (RDV 002)
36111095374 / 36146792828 49mm (RDV 003)
36111095373 / 36146792827 51mm (RDV 004)

Besides the ability to rotate; what are the advantages of the square setup?
The 18x9" ET42 w/ 245/40/18 and 18x10" ET25 w/ 275/35/18 wheel and tire set up should work great on your car even with the lowering springs you have installed. This set up will also work just as well with the coilovers and camber plates that you have planned to install down the road.

When going to a square set up most people usually have the camber plates already installed on the car so they can fit much larger wheels and tires up front than they would with a car with stock negative camber. The 18x9" ET42 with a 245/40/18 tire is the widest combination we can make work on the front of a Z4M with out additional negative camber. Once camber plates are installed than you are able to use an 18x9.5" ET35 in the front with a 265/35/18 tire. Grip is greatly improved in the front end of the car and you are also not sacrificing rear wheel and tire width/grip like you would be if you had stock negative camber up front. So the largest benefit if you have camber plates up front is the increase in front end grip and decrease in understeer. If you only have stock negative camber up front than the largest benefit you would see is just the ability to rotate your wheels and tires.

As for valve stem measurements we always just go by the stock or oem lengths.
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