Wheels and speedometer
Thread Starter
Member
Joined: Mar 2004
Posts: 235
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From: Kansas City, MO, USA
1989 560SEL, 1999 S600, 2005 S600, 2008 S550 4Matic
Wheels and speedometer
I'm considering purchasing a set of new 16 inch chrome wheels mounted on P225/R60 tires for my 84 300SD. I was just wondering, since the car's original equipment was P195/70R14 tires, will the change in aspect ratio affect the accuracy of my speedometer? Any assistance would be greatly appreciated.
Thanks all.
Thanks all.
Member
Joined: Sep 2002
Posts: 220
Likes: 0
From: Westchester Co. NY
99 C43 AMG & 2008 Corvette 1LT Z51 LS3
http://www.1010tires.com/tiresizecalculator.asp
TIRE #1 - 195/70R14 / TIRE #2 - 225/60R16
Section Width: 7.67 in 195 mm / Section Width: 8.85 in 225 mm
Rim Diameter: 14 in 355.6 mm / RimDiameter: 16 in 406.4 mm
Rim Width Range: 5.5 - 7 in / Rim Width Range: 6 - 9 in
Overall Diameter: 24.74 in 628.39 mm / Overall Diameter: 26.62 in 676.14 mm
Sidewall Height: 5.37 in 136.39 mm / Sidewall Height: 5.31 in 134.87 mm
Radius: 12.37 in 314.19 mm / Radius: 13.31 in 338.07 mm
Circumference: 77.72 in 1974.0 mm / Circumference: 83.62 in 2123.9 mm
Revs per Mile: 840.7 / Revs per Mile: 781.3
Speedometer1: 60 mph 100 km/h / Speedometer2: 55.7 mph 92.9 km/h
Speedometer Difference: 7.602% too slow Diameter Difference: 7.07%
TIRE #1 - 195/70R14 / TIRE #2 - 225/60R16
Section Width: 7.67 in 195 mm / Section Width: 8.85 in 225 mm
Rim Diameter: 14 in 355.6 mm / RimDiameter: 16 in 406.4 mm
Rim Width Range: 5.5 - 7 in / Rim Width Range: 6 - 9 in
Overall Diameter: 24.74 in 628.39 mm / Overall Diameter: 26.62 in 676.14 mm
Sidewall Height: 5.37 in 136.39 mm / Sidewall Height: 5.31 in 134.87 mm
Radius: 12.37 in 314.19 mm / Radius: 13.31 in 338.07 mm
Circumference: 77.72 in 1974.0 mm / Circumference: 83.62 in 2123.9 mm
Revs per Mile: 840.7 / Revs per Mile: 781.3
Speedometer1: 60 mph 100 km/h / Speedometer2: 55.7 mph 92.9 km/h
Speedometer Difference: 7.602% too slow Diameter Difference: 7.07%
