Rim/Tire Size Question

[VinnyOC]

Hello,
I recently upgraded to a 2013 M37xS from a 2006 M35. I had the Nissan 370z 19" Anniversary Edition gunmetal rims on there. I also had the tire size 245/40/19 on all 4 rims, so there is a slight stretch on the rear wheels given its 10.5. My question is, can I use this setup on my current vehicle? Can anyone confirm/deny that you need to have all rims the same size on an awd vehicle and can i get away with this since i'm using the same tires all around? Has anyone else gone from 20" to 19"?

Let me know!
Thanks,
Vinny.

[Altered]

19" on this car look small to me and it may be a little funky to the AWD and ABS systems, but I think it could physically work. Aside from that I've run staggered wheels with the AWD and no issues as long as the tires have the same (within 3% I've read) overall diameter.



^^^That was lowered on Eibach springs and with 255/40 front and 285/35 rear so if you do choose to go with the Z 19s definitely get coilovers.

[DoN_BLaZe34]

It'll throw your speedometer off but it'll work...the correct size would be 245/45/19 since the stock 20's are 245/40

[VinnyOC]

@Altered, thank you for your feedback. Why would I need coils if I use 19" rims? To compensate for the extra wheel gap?

@Don_BlaZe34 according to 1010tires, the stock size is 245/40/20. Throwing my speedometer off? How off? lol.

[DoN_BLaZe34]

Right, as I stated the stock size is 245/40, the 20 was implied.

I actually take back my initial comment about it working...it will physically work/fit on the car but you'll be more than 3% (3.5% to be exact) off on the speedometer. So when you're going 60mph, your speedometer will read 57.9mph

To get closer to the stock size you'll need 245/45/19 tires

I hope this helps.

[Altered]

@Altered, thank you for your feedback. Why would I need coils if I use 19" rims? To compensate for the extra wheel gap?

Yes that is what I meant, you don't physically need coilovers to install the 19's, but in my opinion aesthetically you do lol.

[PeteFiniti]

@Vinny I recently went through the same dilemma as you. I chose to go with 20" square setup from stock 18" on my '12 AWD. I don't want to deal with the tire rotation pain and that is why i stayed away from staggered. I get the tires and wheel installed this week.

As for coils on your car.. To give it attitude with will have to lower the altitude. I will I will go the bc coil over route at some point soon.