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Here are the specs of the stock 14s 195/70R14
Section Width: 7.67 in 195 mm
Rim Diameter: 14 in 355.6 mm
Rim Width Range: 5.5 - 7 in
Overall Diameter: 24.74 in 628.39 mm
Sidewall Height: 5.37 in 136.39 mm
Radius: 12.37 in 314.19 mm
Circumference: 77.72 in 1974.0 mm
Revs per Mile: 840.7
Actual Speed: 60 mph 100 km/h
These are the specs of my 15 inch wheels 205/65R15
Section Width: 8.07 in 205 mm
Rim Diameter: 15 in 381 mm
Rim Width Range: 5.5 - 7.5 in
Overall Diameter: 25.49 in 647.44 mm
Sidewall Height: 5.24 in 133.09 mm
Radius: 12.74 in 323.59 mm
Circumference: 80.07 in 2033.7 mm
Revs per Mile: 816.0
Speedometer1: 58.2 mph 97.0 km/h
Speedometer Difference: 3.026% too slow
Diameter Difference: 2.95%
And the 17s: 215/45R17
Section Width: 8.46 in 215 mm
Rim Diameter: 17 in 431.8 mm
Rim Width Range: 7 - 8 in
Overall Diameter: 24.61 in 625.09 mm
Sidewall Height: 3.80 in 96.52 mm
Radius: 12.30 in 312.42 mm
Circumference: 77.31 in 1963.6 mm
Revs per Mile: 845.1
Speedometer1: 60.3 mph 100. km/h
Speedometer Difference: 0.523% too fast
Diameter Difference: 0.53%
These are all from 1010tires.com
I'm actually doing the speedo correction on my fuel log.
The 14s are the steelies and they are the lightest ~ 16 kg
the 15s are 17 kg
the 17s have very heavy tires on them.
My hypermiling is pure city by the way.
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