Speedo

[laser8822]

My speedo is about 15mph off. What would cause this? It's a automatic. Please let me know. Thanks

 

[steve]

Assuming nobody has messed with the gears and that the gauge isn't messed up, the first question is what size tires are you using?

Steve

 

[tstkl]

and the second question is have you taken into account that the speedo on our cars starts at 5mph? ive always found that hilarious...

 

[laser8822]

It's got the stock steel wheels, and the tires are 195/14's

 

[steve]

The tires are 195/14's

Your missing the profile for the tire so I can't tell you how far off it is. The original tires for the 1.8L NA cars was a 185/70R14, where 70 is the profile or aspect ratio.

You can find out the differences based on typical dimensions for a given tirre size with the calculator at http://www.miata.net/garage/tirecalc.html

Steve