Google maps
#1
Racer
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With Google maps adding speedometer to it's directions I noticed my 99 being 2 to 3 mph behind.
I wonder how accurate that would be.
My 99 says 70 but Google maps says 67
I wonder how accurate that would be.
My 99 says 70 but Google maps says 67
#2
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That's very common. 5% deviation (or was it 3% ?)is acceptable and manufacturers usually set up speedometers to show a little more rather than a little less to avoid getting blamed for speeding tickets.
#3
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My 99 is 3 mph fast at that speed, too.
#5
Racer
Thread Starter
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It's funny at 60 it's 2mph high and 3mph at 75 lol
Last edited by Sin1UZFE; 06-24-19 at 10:55 PM.
#6
Racer
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https://www.miata.net/garage/tirecalc.html
#7
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You should have a 245/45/18 for the most accurate overall diameter to stock. I've got IS350 wheels with that size tire and I believe I'm only 0.2% larger than stock. Your size is 3.4% smaller than stock which would explain more revolutions per mile.
https://www.miata.net/garage/tirecalc.html
https://www.miata.net/garage/tirecalc.html
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BNastee (06-25-19)
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