Quote Originally Posted by speedminded
Jtuned's fitment guide says to use 275/35-19 http://www.jtuned.com/content/templa...=426&zoneid=16


The calculator http://www.miata.net/garage/tirecalc.html says using the 275/30-19 will make the speedo off by about 4.4% (35 more revolutions per/mile or 3mph at 60mph) while using the 275-35-19 it will be off just 0.4%, about 3 revolutions p/ mile or a 0.2 mph differance from the stock tire @ 60mph.
wow thanks i think they sent me the wrong tire size cause 275 35 19 sound right thanks alot