i have deep dish rims and want to get nitto dr's 315/35 and i was just wondering will this set off my speedometer? i want to get the tires but not if it throws the speedo off. so should i get the tires or the diablo predator tuner?

 

With those tires and rims, you should be very close to stock tire and wheel height.

 

If im not mistaken it will throw off your speedo just a little bit.

I've got a link back at the office I can use that will tell you how far off your speedometer will be when you drive with the different size tires.

 

http://www.miata.net/garage/tirecalc.html Plug your stock size in first then the 315's

It will not throw anything off at all...I have the 315's and the are a PERFECT fit!