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Aoresteen
Well-Known Member
I thought I'd report my speedometer changes when I swapped tires & wheels on my 1990 Ranger Super Cab 2WD.
My Ranger Super Cab came with 14" rims and 215/70R14 tires and 3.45 rear end gears.
I switched to 15" rims and 235/75R15 tires.
Naturally this caused speedometer errors. Using my GPS I was able to check actual speeds:
Speedometer indicated 60 MPH, actual speed was 66 MPH
Speedometer indicated 65 MPH actual speed was 72 MPH.
I then swapped out the 7.5" rear end for an 8.8" rear with 3.73 gears. The speedometer is now accurate. Indicated speed is my actual speed. I guess I just got lucky with my new tire/wheel/rear gear combo.
My Ranger Super Cab came with 14" rims and 215/70R14 tires and 3.45 rear end gears.
I switched to 15" rims and 235/75R15 tires.
Naturally this caused speedometer errors. Using my GPS I was able to check actual speeds:
Speedometer indicated 60 MPH, actual speed was 66 MPH
Speedometer indicated 65 MPH actual speed was 72 MPH.
I then swapped out the 7.5" rear end for an 8.8" rear with 3.73 gears. The speedometer is now accurate. Indicated speed is my actual speed. I guess I just got lucky with my new tire/wheel/rear gear combo.
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