I am still a tad confused with the 370 offsets. Would it be possible to run 19x9F +25 tire 255/35 and 19x10R +25 tire 285/35 without any issues (this would be for the sports package)

If you go from a stock 275 to a 285, it will make the speedometer inaccurate wont it ?

^^^No, the overall diameter is what changes speedometer calculations, not width.

i think the front tire set up of 275 is to wide. Won't that hurt the performance of the car? If you look at the lambo and other exotics there tire set up for the front isn't that wide usually.

Lambos and other exotics are usually mid-engine cars with more weight over the back than the front so much less tire is needed. Skinnier tires up front is also the factory's way of dialing in understeer to vehicles for safety purposes.

I run a 295 up front on the time attack 350Z, and will be running a 275 up front on my track setup for the 370Z. Going with a wider front tire will hurt the vehicle's turn-in and straight line speed with the added weight and rolling resistance, but what it gains in corner entry and mid corner speed usually far outweighs the losses.

Ah I get it. Thanks for the info.
Just curious what size are you going to use for the rear tires? since it's a front engine, other than for better cornering, more weight and what not is there a bad thing going wider on the rear for the 370?
Going 270 up front will you need spacers?

No you will still need bigger tires in the rear, just usually not as big of a difference between front and rear as say a mid or rear engine car.

Because of the time attack class I am running the car in I am limited to a 285 max width tire. If I wasn't limited I would probably do a 305 in the back and probably no more than a 20mm difference between the front and rear.

DD,

What is the widest tire you would recommend for a 10" rim ?(rear) Could I get away with a 305/30/19 ?? (Stock sport rim with 5mm spacer)
I really would like to try a set of the Nitto Invo's, I wanted to go with a 295/30/19, but they don't make this size. seams pointless to only go to a 285.

Braden

According to the Nitto web site the rim range for the 305.30.19 is 10.5 - 11.5" with their measurements taken on an 11" wheel. If you used the stock 10 it would pull the sidewalls in a bit.

I mounted a Bridgestone RE-11 305/30 R19 to the stock 10" wheel. The sidewall gets pulled in a tiny bit but otherwise fits perfect.

Thanks Chris, I didn't think it would be a huge problem. When I put Nittos on my Mini Cooper S they recommended a 7.5 inch rim for a 225 tire and I'm running a 17x7 with no problems. I really want to try out those Invos because of the non directional tread, and the only choice would be 285/35, 285/30 or 305/30. The 305/30 seams to have the best sidewall height IMO.

did you take any pics when you mounted it??

I think the Invo's are directional as they have different compounds in different sections. The overall height is pretty close, 26.2". Mine are 26.3" rear and 25.6" front and no problems with the VDC, still fully functional.

I'm going to take some pics today of the mounted tire so you can see the curve and contact patch. I went to yesterday but my camera battery was dead.

Pics.

Rear contact patch. Notice how the sidewalls are pulled in slightly, so the contact patch isn't a full 305 that it would be on a larger rim. The upside is that the tires might last longer before they cord in a camber limited environment.
http://www.the370z.com/members/chris...larger-rim.jpg

Front contact patch. Much better here, nearly a full patch.
http://www.the370z.com/members/chris...5-35-9-rim.jpg

Rim bulge from behind.
http://www.the370z.com/members/chris...bulge-rear.jpg

View from top of rear fender.
http://www.the370z.com/members/chris...top-fender.jpg

View of fender rear well.
http://www.the370z.com/members/chris...-clearance.jpg

Probably should of put these somewhere else, didn't mean to highjack this thread.

Is that a pic of the 305?

Chris,

thanks for the pics :tup: gave you some rep points for that.
Do you have any full shots of the whole car?, I'll check your gallery.
yes, the Invos are non-directional, so you don't have to take them off the rim to rotate, just move them from side to side. :tup:

thanks again.