[Boghog]

Ever wonder how much your speedo is off when you change tire sizes.Here's a website that can tell you. Tire size calculator

 

[lcd3000]

Thx for the link!

 

[05CVPI]

Hand held tuner can fix that.

 

[Torch]

Not sure how width makes a difference. I went from stock 225/55-16 to 315/35/17 in the back of my car... and it reads spot on. As long as the overall circumference is the same or close it wont really be too far off.