Speedo accuracy

[Stan]

My coupe wears the 225 / 60 / 14 Michelins.
On my long trip to Saratoga I took the opportunity to use my GPS as a speedometer to compare to the one in the car.

To my delight... Spot on!

 

[Stevehose]

Thanks for keeping the faith with the 14" wheels! I have 215-65-14's and I read about 3mph fast at 70mph.

My coupe wears the 225 / 60 / 14 Michelins.
On my long trip to Saratoga I took the opportunity to use my GPS as a speedometer to compare to the one in the car.

To my delight... Spot on!

 

[KHB]

Running 195/70-14 and 3.45 diff it was 4-5 mph fast. Just changed to a 3.25 diff and now it is just 1mph fast.