In what way did I change my gears ratio?

[BradC]

I went form 215/60/16 to 245/50/60. If my ratio was 3.23 before, what is it now? Is it stiffer if softer?

[gregmondro]

it didn't change your gear ratio at all.

the two tires are actually the same diameter.
i did the same thing, there is about a half an inch difference in diameter, but that isn't enough to change your gear ratio all that much if any at all.

[black98V6]

this will give you a percentage change you can do that to see how you effectively changed your gearing..

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

[SlimJim1284]

one question: do bigger tires = bigger gear ratio?
or do bigger tires = smaller gear ratio?

[black98V6]

taller tires give you the effect of a higher gear(numerically lower ration) smaller tires will give the effect of a lower gear (numerically higher)

[AMinor65]

About 2 percent, so now you're simulating a 3.29 axle ratio.