Tire size and speedo...

[unity]

How much would my larger rims, 20 inch, with 225/35/20 affect my speed. I assume not much. But set side by side I am surprised how much larger the new ones are. I ask because it seems like I am going faster than my speedometer reads when 65+mph.

 

[mafioso]

great tool.

http://www.miata.net/garage/tirecalc.html

 

[unity]

Perfect! I guess not much indeed. Well then people must be getting slower!

 

[mafioso]

hahaha Glad I could help.

 

[Icarus]

If it's only out <1mph at 60, I wouldn't worry about trying to correct it.

 

[mespock]

Perfect! I guess not much indeed. Well then people must be getting slower!

Your just a lead foot LOL