Need help with size of tires (Profile)

[hikealii]

hey guys, so i need some help with tires/rims
so i want to get these new rims that come with tires but they are different from my stocks and I was wondering if the tires are driveable and safe.

so here are the specs:

New Tires = 225/50/17

Stocks = 215/65/15

Are these new tires going to be okay to drive with? cuz i know the profile is much slimmer. if not, then what tires or rims could i get that look nice and is going to hold the weight of my Q.

please help me and all advice welcome..

thank you (:

[OwnerCS]

Tire Size Calculator (stock versus new)

http://www.miata.net/garage/tirecalc.html

When you speedometer reads 60 you will be moving 59.7 MPH.

[BadQ45t]

Those will work but they are not optimal. You should see what the load rating is in them, this is a number after the size on the side of the tire. If they are not at least a 94 load rating, they are not really strong enough to hold up the weight of your Q45. If they are 94, which I suspect will be the number they will work.

When you wear those out, you should find a set of 245 45 17 to replace them. That is a really good size to replace the stockers with, I ran that size when I was running 17" rims. I have 19" rims now and upgraded no my newest set of tires to XL load rating 98's which are really better for such a heavy car.