Reviewed By Michael A (Fritch, TX) Reviewed for a 2015 Dodge Ram —8/23/2018 9:26 AM
Went from 33" tires to 35" tires so speedo was off about 4 miles an hour at 75. Ordered this little gizmo, measured the tires by the chalk and roll one revolution method, and on the first try of setting tire height into the system, speedo was spot on. 15 min: tops. Little pricey, but it does have gears settings as well which I'm plan on switching out in the near future as well.