Changed Tire Size
#1
Changed Tire Size
I Went From A Size 15 Tire To A Size 17 On My Truck ,so Now If 'my Speedometer Says I'm Going 60 Mph What Would My Actual Speed Be With The Two Inch Difference In Tire Size?
#2
Forum Topic Moderator
High tech - take it to a dealer that does speedometer calibration. They can either fix the speedo so it reads right or give you a printout of the various speeds.
Low tech - get on the interstate and gauge your odometer by the mile markers, a 10 mile run is best. If you travel 1 mile and your odometer reads .9 of a mile you know that your speedo is approx 10% off -50mph=55mph
Also just because your rims are 2" bigger doesn't mean the tire circumferrence is neccesarily bigger as you might have a lower profile tire.
Low tech - get on the interstate and gauge your odometer by the mile markers, a 10 mile run is best. If you travel 1 mile and your odometer reads .9 of a mile you know that your speedo is approx 10% off -50mph=55mph
Also just because your rims are 2" bigger doesn't mean the tire circumferrence is neccesarily bigger as you might have a lower profile tire.
#3
Group Moderator
Medium Tech: Talk to someone in a tire shop and find out the diameter of both your old and new tires and we can do some math for you.