Speedometer Calibration

[awesomebob]

My speedometer reads 65mph, and my GPS reads 60mph. Can I buy a device to correct this or does someone know a good shop in Torrance CA.
Thank you.

[wwest]

Originally Posted by awesomebob

My speedometer reads 65mph, and my GPS reads 60mph. Can I buy a device to correct this or does someone know a good shop in Torrance CA.
Thank you.

Yes, it's called Discount Tire.

But first check for the correct rear tire size, tire wear level, and proper inflation.

+/- 5 MPH at ~60MPH might be as close as you can get throughout the tread life of the rear tires.