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Do you need to adjust your speedometer if you change the size of your tires?
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this post was submitted on 01 Feb 2025
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It depends if your car uses GPS or ABS(Wheel speed) to determine MPH. Generally speaking, if you increase the diameter(circumference) of your tire(not wheel[rim] necessarily), then you need to recalibrate your car to have an accurate speedometer reading.
The larger the diameter, the slower your speedometer will read because your tire makes less revolutions per distance traveled; because speed is distance over time. If your speed is determined by the number of revolutions based on the stock diameter of the tires(+/-5% due to tire wear) then going up considerably(>5%+/-), then your speed will be off.
Realistically, if everybody is speeding than nobody is, so if you throw 37s on your 32 stock vehicle and keep with traffic, you will be fine until you aren't. Don't be stupid, have your car calibrated for your tire size so you don't get pulled over for speeding with a kilo of fent in your trunk.
Only break one law at a time, breaking two is begging to get pulled over.
Can you tell me some cars that use GPS for the speedometer?
Yeah, pretty sure that's not a thing.
Using GPS to drive the spedo/odo on a car seems like it wouldn't be super reliable?
That's why it's not a thing and OP is wrong.
Not so good in a tunnel or surrounded by high rise, trees etc.
A lot of tunnels have GPS beacons to mitigate the issue of constellation blindness.
Can you tell me some tunnels that have GPS?
It becomes reliable if the car uses all the other sensors together with the GPS. Current German cars do that for their internal computers, for positioning, controlling their driving dynamics etc. Such systems are able to drive through several kilometers of tunnels and still know their own position with a deviation less than a meter, and afterwards adjust it again from GPS and mobile antennas etc.
But they usually don't display this data on the spoedometer.
Than is not then
While you are technically correct, the best kind of correct, fuck off and die in a well.
whenever i've driven an unfamiliar vehicle, i've always checked with the mile markers on the freeway. 1 minute for 1 mile at 60 mph. if it's off too much you can adjust your driving accordingly so you're at least 'close enough'