17" wheels, speedometer off?
08-05-2008, 04:55 PM
#1
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17" wheels, speedometer off? So I went from the 16" twisties with 245/50/16 tires to 275/40/17's. According to the highway sign distance to the gas station, the trip odometer is still accurate, and I still do 60mph at 2k rpm with the 3.23 gears, but it seems like the trip odo is ticking fast. Is it just in my head?
08-05-2008, 05:34 PM
#4
It's almost exactly the same.
245 size -
Overall Diameter: 25.64 in 651.25 mm
Actual Speed: 60 mph 100 km/h
275 size -
Overall Diameter: 25.66 in 651.76 mm
Speedometer1: 59.9 mph 99.9 km/h
Speedometer Difference: - Speedometer Difference: 0.074% too slow
Diameter Difference: - Diameter Difference: 0.08%
Not worth writing home about.
245 size -
Overall Diameter: 25.64 in 651.25 mm
Actual Speed: 60 mph 100 km/h
275 size -
Overall Diameter: 25.66 in 651.76 mm
Speedometer1: 59.9 mph 99.9 km/h
Speedometer Difference: - Speedometer Difference: 0.074% too slow
Diameter Difference: - Diameter Difference: 0.08%
Not worth writing home about.
08-05-2008, 05:44 PM
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http://www.miata.net/garage/tirecalc.html
http://www.onlineconversion.com/bigger_tires.htm
you can use those later on if you need to see how much of a change it will make
http://www.onlineconversion.com/bigger_tires.htm
you can use those later on if you need to see how much of a change it will make
08-09-2008, 02:02 AM
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So I went from the 16" twisties with 245/50/16 tires to 275/40/17's. According to the highway sign distance to the gas station, the trip odometer is still accurate, and I still do 60mph at 2k rpm with the 3.23 gears, but it seems like the trip odo is ticking fast. Is it just in my head?
