Question:
Ex. My car came stock with 17 inch wheels. I changed them to 20 inches. My friend says this will affect how the speedometer calculates speed. I say it doesn't change it at all. Who's right?
Answers:
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Your friend is right. Every inch will change the speedometer 2 to 3 miles per hour. So a 3 inch growth in diameter will probally increase your car's speed about 8 miles an hour over what your spedometer says.Do you think drivers on the road are more rude today than yesterday?
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it does change it, your speedometer will read 60 when you might be actually going a little faster or slower depending on the tire sizeAnyone notice lower mpg in their car/truck in the last year??
it does effect the speedometer! i know this is true.your friend is right.the speedometer is set to be accurate with the amount of rpm's your 17 inch tires made. Now you are going faster than the speedometer says. I know this for a fact because I got pulled over for this in my SUV after putting on larger tires than it came with from the factory.
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The only thing that will change the speedometer is the outermost circumference of the TIRE. As long as the tier/wheel combination has the same circumference there will be no change. Example....if you are running say 32/10.5/r-17 and go to a 32/10.5/r-20 there will be no change. but if you went from a 32 to a 35...then yes, you'll need a speedo-gear change.anybody know where i can buy some cheap 53ft trailers?
You can change the size of your rims, but have to keep the tire to the same outside circumference. A taller or shorter tire will change the speepo, NOT the rim. The speedometer and trans are calibrated to the specific distance that the outermost part of the tire rotates within one revoltution. If the tier travels 9 feet within revolution, it does NOT change the hub speed. But if the tire now travels 9.5 feet, it will change. It's the outermost measurement of the tire!!!!
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a 25' tire with a 15inch rim travels as far as a 25inch tire with a 20inch rim!! The sidewall of the tire is where the measurement changes...... NOT the outside. The car doesn't care what size rim you have, as long as the tires height is the same as stock!!!!
The fact that all tires come in sizes to accomodate different WHEELS should be a clue. the wheel goes in the tire. the tire touches the ground. the whole thing goes around.
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the taller the tire the slower the speedodmeter will read. you will if the car is fairly new need to only take it the dealer and reprogram the onboard. if it is an older make you will need to change the gear on the end of the speedodmeter cable at the transmission to calibrate it98 Chey Cavalier "check engine" light is on, had AutoZone run a scan and found a 1404 code.?
No, the speedometer is connected to the transmission, not the wheels. Twenty miles per hour is twenty miles per hour no matter what size the tires.Does your Car or Motorcycle have a "name"?
You are wrong, increase the tyre size will make the speedo read slower than the speed you are moving for example a 17 inch diameter wheel has a circumference of approximately 54 inches while a 20 inch diameter wheel has a circumference of 63 inch so as the speedo is calculated on the outside circumference of the wheel you can see it will make a differenceDo you try to keep your car's mileage low ?
When you increase the diameter of the rim, you must decrease the diameter of the tire. If you do not decrease the diameter of the tire, the overall diameter will be bigger.And by the circumference equation, C=Pi * diameter, any increase in diameter will increase the circumference. And therefore, will increase the distance traveled per revolution. This will make the speedometer display less than the true miles per hour. So, your friend is right :)How do I start/ get into the car hauling business?
It will affect both the speedometer and the odometer. If your wheels are bigger, there's more surface area that will be covered (more ground covered) for each revolution of the wheel. So each revolution of the wheel will take you a longer distance. So your speedometer will say you're moving slower than you actually are, which could get you into issues with speeding tickets and driving at a speed that's unsafe for the conditions.The car will have been calibrated according to the stock wheel size, so changing them without having everything else recalibrated will cause errors.yes it does affect the speedometer. You need to stick with the same size tires that is recommended for your vehicle if you want to know just how fast you are going.Get a mental picture of a big wheel and a little wheel. The little wheel will have to spin faster than the big wheel to cover the same distance. So in turn your speedometer could possibly show you doing 45 mph. when actually you could be doing 50 or even 60 mph. on a radar gun. So yes your friend is right.
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It does change it, bigger tires will make it look like you are going slower than you really are.Will a air intake or cold air intake help with gas mileage, also will it mess up your engine at all?
Anything departing from the MFG.s recommended tire size isgoing to affect your speedometer's accuracy noticeably.
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Look online for a superlift true speed they might have a system to fix your speedo prob and answer your Q?http://www.superlift.com/accessories/tru...
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You both might be right! It depends on the circumference of the tire, - not the size of the wheel! The speedometer reads the same (speed of the engine to gear ratio of the diferential) as it always did, - however if the circumference of the tire is different, then the tire (&wheel) will turn more, - or less revolutions per mile! Depending on wether its is smaller or bigger!How many miles a day is fair when renting a car with unlimited millage?
Now, - a lot of these "sporty wheels" have tires that only have about 1 1/2 inches between rim and ground - as compared with the "old normal" wheels, -- which have 4-6 inches clearance between rim and gound! So both might have the same actual circumference! ....Visualize two circles exactly 2 inches in diameter,----now draw a circle inside each one, -- one circle 1 3/4 inches, - and the other one 1 1/2 inches, -- which is bigger on the outside (circumference)?? This is what your two wheels and tires could look like visually!
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Personally you couldn't make me put the 20" Aluminum "thin spoked" ones on my car,- (except with a "gun in my back") They look sporty and "hot" for sure,-- but they make the car ride like a lumber wagon! And this is an unwarranted expense to make the car ride in that manner!
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It will affect the speedo. When you increase your tire size, the speedo needs to be re-calibrated.More Questions & Answers ...
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