How does Tire Size change Speedometer?
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- Опубликовано: 4 окт 2024
- Hi, this is a video I found that I made a couple years ago. I apologize for the shaky camera. And the "how excited" at the end was artificially added today.
I hope you guys have a nice week!
Guy getting fined for speeding
Andy: “How exciting!”
lmao
@@goodshiro10 "Sign this ticket, please." "That looks important, I'll put a box around that."
@@Qermaq lol 😂
This literally explains why every single raised truck driver I see is speeding so much
There's also the fact that raised truck drivers are often douchebags.
Nah they speed because they think they’re cool
They lift their truck because they can’t lift something else 😂
@@nothingtoseehere93you baaad 😂🤣🤣🤣
@@matthewkendrick8280speeding is like smoking, you look cool when doing it but nobody wants to admit it
Completely accurate. I had a Wrangler and switched out my 16" factory tires for 17", all-terrain tires. I noticed the change from traveling long distances with family members in other cars who always said I was speeding. After realizing the root cause of this, I started dropping my speed about 3 or 4 mph. Never got it recalibrated 😂
No officer, i multiplied my speed by the golden ratio then took its squareroot. I was driving well within the legal limit.
Officer: how exciting
Is that a Jojo reference?
I have a Yellow Box speedo recalibrator.
Its a little gizmo you buy and attach to the truck's speed sensor, and you can set the Yellow Box to any ratio you want, so you can set the speedo and odometer to work accurately again. Awesome gadget, even has a 10 year guarantee where they replace it if there is a problem. 👍👍👍
Great video. Of course, if using the truck off road, it's best to change the gearing in the axles to account for the larger tires. I have 35" tires on my 1985 4Runner and swapped from 4.10 to 4.88 gears in the axles and the speedo is dead on compared to GPS.
The original tires were probably 31", right?
@@richardl6751 Actually around 28" to 29", the Toyota models of this vintage that came from the factory with 31" tires, had 4.56 gears in the manual transmission models.
I wondered about this, years ago. it's very gratifying to find out precisely
My first car was a used Chevette (back in 1985), and the tires that came on it were oversized. I noticed because I constantly did arithmetic on road trips to estimate when I'd arrive at the next city based on the speedometer reading and distance. It was always off by about 10%. So then I started timing myself between mile markers. By doing that, I knew it was off (and by how much) but I didn't know why until it needed new tires. I bought the correct size, and bingo. Speedometer was accurate again. These days a GPS will tell you how fast you're going, so there's more hope for people who don't do recreational arithmetic while driving.
This was one of the first things I thought about when I started driving.
Jay Leno: would you like to join me for a car review?
Andy Math: sure. but how does tyre size change speedometer?
I've been subbed and watched almost all the videos he's posted for several months now and this whole time I had no idea that was his name lool
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16% higher speed also translates to 16% lower torque at the wheels, so the effect is like taller gearing.
When I swapped to lower-profile tires ages and ages ago, I worked it out that they were only 2% smaller in diameter, so I didn't get too arsed about it. That difference is about equal to worn-down tread vs new.
How exciting ❤
Simple but useful channel, how exciting👍
Real life math. Love to see it.
That is fascinating.
I did this math for the truck I bought from my brother 30 years ago and used junk yard marker to relabel the speedometer.
automotive thought: milage isn't really a good indicator of a vehicle's usage, right? (obviously not the point of the video) so the fact that a vehicle with oversized wheels "has higher milage" doesn't in and of itself indicate greater wear. though you could do the opposite, and put tiny little wheels on a new car and reduce the apparent milage for the resale value . . . but that wouldn't be nearly as smart as &E
Yea I thought the same thing. The measurement that matters mechanically is really the amount of times the axel rotates which is actually the same amount of times for 87k vs the new 100.5k, right? I’m not mechanically well versed but this was my first thought.
It has greater wear because putting on larger tires and lifting the chassis increases the stress on the entire powertrain and the suspension exponentially as you go taller and taller. Like, a two inch lift is no big deal, but the guys who need stepladders to get in their trucks are beating the entire machine to death just by driving it. These mods are abusive.
@@bloodleader5 Good point. Re-engineering stuff without, yʼknow, understanding engineering, is often a bad idea.
Before watching it: it makes sense to me that if the odometer reads properly on the 32" tires, then it would read only 32/37 of the actual distance with 37" tires. So your odometer would register only about 0.86 of the actual distance traveled.
All this is true. But keep in mind, all Speedometer and Odometer outputs are run through the car's computer first. Within the computer's is a register that will "handle" the tire's circumference such that speedometer and odometer's outputs are accurate. If tires/upgrade installed by dealer/manufacturer - that register (and likely other's that control the engine and transmission) will be updated before the consumer gets the vehicle.
If tires are installed aftermarket, then one needs to confirm that the necessary registers have been updated.
I've got a jacked up truck on big tires, but I've known that from the start. Mine is off roughly 10%,so it is fairly easy to estimate my real speed.
I did get pulled over once. It was my fault. I was kinda zoned out on the speed adjustment, and I wasn't gonna dispute it. But the officer just offered up "maybe your tires are throwing off your speed". I was like "oh yeah, never thought of that before". I wasn't going to look a gift horse in the mouth and left happily with my warning
"your honor, i just have a bigger tires"
Every thing went over my head😂
I'm guessing the people who do this to their vehicle have no clue about math like this.
Yeah but the shop that does it definitely knows
The Jeep community is very much aware of this; there are tuners that can change the speedometer / odometer.
Wow you are very wise.
Your guess would be wrong.
Well if you buy speedometer for bicycle, you must enter diameter of your wheel, so you kinda learn of this. But your car is most probably tuned in workshop by someone else, so if they don't change car meters, it shows wrong speed and distance.
How exciting!
I think most are aware. Forget all the cross multiplying just take the originally ratio 32/37 and you get ≈.86 that’s now your factor you need. Just divide it from anything your vehicle says 70mph/.86 = 81mph, 87k/.86 = 101k . Put a box around it.
I've wondered this but only in relation to new tires vs bald tires. The difference would be much smaller, but not zero.
Youd be working at Red Robin if you didnt have such an awesome lowkey salacious voice
At the same rpm, the bigger tire will be faster because larger circumference so more distance travelled.
What really noodles people is when you tell them that drawing a line 1 inch above the earth, all the way around, increases the circumference by exactly the same amount as doing the same thing to a tyre.
Pid = pid 🤷🏾♂️
legally outside some percentage outside of the given llegal paperwork in EU is NOT allowed.
I forgot so much about math, do you have any ideas I should go about learning all of my high school math and some college level math, and then some?
You can learn everything here on RUclips a thousand times over.
@@falsedragon33 I know but what the heck do I even look up? I don’t know the names of anything and I’d rather not find a full on course as that’s very time consuming
Algebra and geometry for basics.
Maybe trigonometry (easier) and calculus (harder) for advanced stuff.
If you want to look at entire fields of mathematics, there are things like number theory, topology, etc.
@@JustinDickins Oh okay, I didn't even know there was number theory, thanks
@@V1c._. you can see many examples of it on the channel Numberphile. Don’t hesitate to watch videos on there that are almost a decade old. There are tons of incredible, fun lessons that will open your eyes to the myriad of maths.
I like Neil Sloane’s videos on sequences, Ben Sparks’ for practical applications, and the list goes on.
So speedometer is getting the speed by looking at the wheel the whole time?
Looking at some of the reactions of this vid of which some are humerous and others more serious. I'm amazed that people who have an interest or apptitude in maths have to have this explained to them.
It's blatantly obvious that changing the wheel size will impact your Speedo reading, oddometer, trip computer (mpg) etc.
It makes it bigger.
Bro forgot to record the "how exciting"
So did this “extend” the warranty or will the mfgr recalculate it?
So, would this make gas milage more efficient then?
Since the odometer us being altered to give a false reading, the vehicle is probably not legal and may be also violating insurance terms.
Hello
The PCM will compare the input of the hall effect sensor that measures the tires with the GPS input, and will correct the error. At least to a point where it will throw a check engine code. Turns out, other people, who actually fix things, knew about this problem too.
Which is only for gps enabled vehicles. Any vehicle manufactured before ~2015 won't have this functionality.
Is bro holding his camera?
Just the ratio of the Diameters - just cancel out the pies
I think ya mixed up wheels and tires.
You use names like SpeedoMETER or OdoMETER but measured values are not in km, but in miles. :)
United States is aligned with Liberia and Myanmar as the only countries which still use ounces, inches, feet and Fahrenheit.
That's just one more thing some Americans can be embarassed about.
When I plugged in my voltmeter, the display said my outlet was putting out 120 meters, too.
Sounds to me like you could put 115,000 actual miles on your lifted Jeep and still selll it as being under 100,000 miles 😅😅😅
This only works in beautifuly perfect world of theoretical mathematics. In the real life where physics exists, the car would have to push extra to get those bigger and heavier tires, not even talking about angular speed, inertia and all that.
That has zero effect on the measurement, as that just looks at how many revolutions the wheel has.
Could people who raise their trucks really give a damn about anything except their image?
AHHHHH CANCEL OUT! No they reduce to 1! 1 times anything is anything!