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np, 80mm extra is actually closer to 3" extra, anyway, here's something that might be helpful for u.
http://www.miata.net/garage/tirecalc.html
u can try like matt says, 195-65-15...that'll improve ride quality, some have no rub, some do...seems like it's different for everyone. if u had wanted to get better grip, going 205-55-15 or 205-60-15 may be ok. but if u think ur ride has deterioated quite a bit, may need some new springs/shocks...these things tend to wear out after 80k, +/-, depending on how the car is used.
p.s. i can't image u complaining about the ride when i'm running 17", hehee ;)
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