hey i upgraded my wheels/ tires to the 17', 215/45 and now the speedo is off does anyone know how to correct it?

 

whenever ypu put bigger wheels and tires then the stock ones your speedometer is always off by a little bit. its prolly only off by like 1 or 2 mph.

 

The short answer: Apexi Rev & Speed Meter

Longer answer:
Assuming that your stock tire size was 195/65-15, your speedo reads 60 mph when you are going 54.3 mph. 9.5% off.

The better option is to get new tires sized at 225/45-17 (actual 60.0 mph) or 205/50-17 (actual 60.2 mph).

For sizing tires when upsizing rims, use this website to see what will happen to the speedo: http://www.miata.net/garage/tirecalc.html