wettRunner
New member
If a 265/70/16 tire, and a 265/75/16 tire display different speeds on the speedometer, does that mean the odometer registers mileage differently too?
Call me crazy...
Call me crazy...
Tire Size Affects Speedometer, What About The Odometer..?
- Thread starter wettRunner
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2016 4Runner SR5
Senior Member
The difference is so small you will likely never notice it. To answer your question though, yes, it affects the odometer also.
I am running 265/75r16 cooper atps on my 99 limited. I have found using a few gps speed apps and passing quite a few posted radars, that my speedo is now correct. My ecu speed and odometer are about 3.5% off. My odometer is electronic. Not sure how it would affect a mechanical odometer
96RedRunner
Senior Member
I ran 33" tires 4.30 gears Auto for 300k miles on redrunner. Speed was 10% higher 60 mph = 66 mph doing rough math thats 30k miles over 300k miles. GPS distance was off approx 10% with odo also.
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wettRunner
New member
haha thats what i'm thinking.. very small difference, but still makes you think.
96RedRunner
Senior Member
For me biggest concern was speed traps at the end of the month when ticket quota hadn't been met, Lol.
AntleredRuin
New member
Slightly off topic, but I always wondered that about getting pulled over. Obviously cops are allowed to pull you over even if you're going only 1mph over, but what's the general 'grey area' where they'll let you slide due to speedometer differences?
My wife's Rav4 actually goes about 3mph slower than the speedo suggests, and it's most definitely stock.
My wife's Rav4 actually goes about 3mph slower than the speedo suggests, and it's most definitely stock.
96RedRunner
Senior Member
[MENTION=129892]AntleredRuin[/MENTION], That varies with the LEO dept. most will laugh and say if you know about it you should have adjusted. I pratice the stay with the flow of traffic idea, you improve your odds for not being the one ticketed. In my area any moving violation is $200 min = run stop sign.
Something like 10% over or less? Very general rule of thumb, and it varies both with what you're driving (flashy/new/etc), where you're driving (some towns are trying to pump up the coffers) and where you're from (some departments are far more willing to ticket out of town drivers).
RedSled
New member
On my 2017 SR 5 i went from the stock tires to a 285/70/17 M/T, i have some of those speed readers in my area, and i am dead on to what the digital is saying.
absalom
New member
You should verify with GPS. That's a big jump in size, and the question isn't whether or not your speed changed, but instead by how much.
Tires, in this sense, should be viewed as gears. And you'd better believe that gear diameter plays a role in speed reporting accuracy.
4Reak Show
New member
I guess if it really bothered someone they could math it out. Just need to know circumference differences right? That would tell you the difference of one tire's rotational travel compared to the others. Simply pi X diameter.
For example
A 32" diameter tire has a circumference of 100.5" inches. A 30" tire is 94.25". (That's half a foot more travel per rotation.) or about 6% off going 30"-32".
Does that mean going bigger adds less miles? I guess so huh. One rotation of a larger tire travels a farther distance than the "calibrated" smaller stock tire.
For example
A 32" diameter tire has a circumference of 100.5" inches. A 30" tire is 94.25". (That's half a foot more travel per rotation.) or about 6% off going 30"-32".
Does that mean going bigger adds less miles? I guess so huh. One rotation of a larger tire travels a farther distance than the "calibrated" smaller stock tire.
RedSled
New member
You are right, i'm going to check it on my Apple watch, thanks.
