this may also be of interest... it should help you get the right tire size
(which i think is 195/45/16)...
http://www.miata.net/garage/tirecalc.html

"Lanny Chambers" > wrote in message
...
> In article >, "joe" >
> wrote:
>
>> Question; will 16" screw up my cornering geometry or will it improve it?
>
> It won't make any geometry difference, as long as the offset is close to
> stock.
>
>> Other than a harsher ride just cruising, any pitfalls here?
>
> SInce you're getting cheap tires, I assume you're also getting cheap
> wheels. Cheap 16-inchers are bound to be heavy, which will hurt ride,
> grip, acceleration, and braking. A lower-profile tire offers less
> protection to the wheel from road hazards, so it's easier to bend a rim.
>
> But the differences probably won't be huge. With those tires, you may
> not even notice.
>
> --
> Lanny Chambers, St. Louis, USA
> '94C
> the alignment page:
> http://www.hummingbirds.net/alignment.html