2007 z4 Roadster - suggestions pls

[rsk]

Hello group

Got myself a 2007 z4 3.0i roadster. After reading this forum I have decided to get rid of all the 4 run flats and replace them with non-rft. I am also going to replace the stock wheels. My tire specs are Front : 255.45R/17 and Rear : 255/40R/17. Can you pls help me with following questions;

1) Can I replace my stock tires with 18" instead of 17".
2) Since I am changing both the tires and wheels , do I need to take to to the dealership or could I do this at a reputable tire installer.
3) I am thinking of purchasing the wheels and tires at Tirerack.com (I live in Canada) and following is what I have in mid. Pls let me know if this is a good choice for wheels and tires. The color of my car is bright red with a black top.

Wheels
http://www.tirerack.com/wheels/WheelCloseUpServlet?target=runWheelSearch&initialPartNumber=688520B4579BML&wheelMake=Avarus&wheelModel=AV6&wheelFinish=Black+w%2FMach+Lip&showRear=no&autoMake=BMW&autoModel=Z4+3.0i+Roadster&autoYear=2007&autoModClar=Sport+Package&filterFinish=Machined+Lip&filterSize=18&filterBrand=All&filterSpecial=false&filterNew=All&filterWeight=All&sort=Brand
Or
http://www.tirerack.com/wheels/WheelCloseUpServlet?target=runWheelSearch&initialPartNumber=2007707HBML&wheelMake=Platinum&wheelModel=Apex&wheelFinish=Hyper+Black+w%2FMachined+Lip&showRear=no&autoMake=BMW&autoModel=Z4+3.0i+Roadster&autoYear=2007&autoModClar=Sport+Package&filterFinish=Machined+Lip&filterSize=17&filterBrand=All&filterSpecial=false&filterNew=All&filterWeight=All&sort=Brand

Tires
http://www.tirerack.com/tires/tires.jsp?tireMake=Continental&tireModel=ExtremeContact+DWS&frontTire=245WR7ECDWS&rearTire=54WR7ECDWS&vehicleSearch=true&fromCompare1=yes&autoMake=BMW&autoYear=2007&autoModel=Z4%203.0i%20Roadster&autoModClar=Sport%20Package

Thanks in advance for all your help

 

[Wondermike]

1. Yes and you would need 225/40 18 fronts and 255/35 18 rears, assuming you get some staggered wheels.
2. If you get a wheel and tyre set from Tirerack you could fit it yourself, or take it to a garage.
3. I think I prefer the first ones.

 

[rsk]

1. Yes and you would need 225/40 18 fronts and 255/35 18 rears, assuming you get some staggered wheels.
2. If you get a wheel and tyre set from Tirerack you could fit it yourself, or take it to a garage.
3. I think I prefer the first ones.

Thanks Wondermike.
I am looking to get staggered wheels.
Do you have any suggestion for xenon lamps for the headlights.

Thanks again
rsk

 

[jonnyfive]

+ 1 for the 1st choice

 

[lacroupade]

Liking both sets of wheels but what colour is the car?

 

[shabba]

A tyre fitter at my gym said if you change from run-flats to normal you need to tell your insurance company......not idea how true but it was what he was saying.

 

[rsk]

Thanks for your responses guys. I spoke to Tirerack.com and the guy mentioned that the wheel I am interested in does not come as staggered. He suggested that I buy the same size (18x8) for all the 4 wheels and use the same tire spec (225/40/18) all around. I am not sure what impact this will have on the performance. My stock spec are F : 225/45/17 and R:255/40/17. Can you pls let me know if it is ok to get the same size for all the 4 wheels.

Thanks for your help
rsk