Hey folks, have a question. I have a 1990 lx with a stock tire of 175-70-14. I bought some gt 15" rims since apparently the chasis is the same, and the car doesnt know which one it is using. But here's the interesting part. Stock tire size for the 1st gen gt rim is 195/60/15. But if you crunch the numbers on a site like http://www.miata.net/garage/tirecalc.html you'll see that the speedo will be off more with 60 series than say 55 series tires. so here's my question, were the gt's speedo calibrated differently, or is the .3 inches in difference so negligable that ford said screw it. Im looking to buy tires tomorrow, but not sure if I should get the 55's since they are within .1 inches of the 14 inch tire diameter, or go for the 60 series since thats stock for the gt rims.
any help appreciated
****edit something interesting i have discovered looking at tire sites is that 195-60-15's are much more available and are cheaper than the 55 series. this is kind of pointing me down the 60 series tire even though it will make my speedo off by 2.4% (when speedo reads 60, i'll really be going 61.4mph)
browntown 90lx
any help appreciated
****edit something interesting i have discovered looking at tire sites is that 195-60-15's are much more available and are cheaper than the 55 series. this is kind of pointing me down the 60 series tire even though it will make my speedo off by 2.4% (when speedo reads 60, i'll really be going 61.4mph)
browntown 90lx