I have a 1990 Honda Civic DX Hatchback, original tires were 175x70x13, new rim and tires are 195x50x15. My mechanic kept telling me my speed was off, but thanks to you and Sharing this tool, I can now prove that my cars tire revolutions are just off by 1/10. Thanks again for this calculator, I have been looking for something like this for a while.
You got me in trouble, my fiancé used the calculator and figured out I've probably been going 10 over everywhere with my jeep. I think rough country makes a Speedometer gear that you can swap out if you know your gear ratio.
Is why I got a diablosport tuner for my Challenger and makes it nice for when ya change tires or wheels, you can reset the speedometer or make adjustments whenever you need. I got it primarily for performance tuning, but it is one of the parameter adjustments on it and also let's you reset codes to
Let's of free time size calculator apps you can download. Also many wheel offset calculators available of you want to change wheel sizes and offsets. On most vehicles it's suggested you stay within a 3% window when changing tire size. Anything more can foul the ABS systems and antilock brakes and vehicle stability control a d traction control. All of those features use wheel speed and detect slipping. Also in your case an almost 10% larger tires effectively results in a 10% higher gear ratio. It would be equivalent as going from a 3.55 axle ratio down to a 3.27 ratio.
I changed out the little plastic speedometer gear in the transfer case. Look up Novak's color coded jeep speedometer gear chart. All you need to know is your differential gear ratio and tire size. My 5.9 ZJ has a 3.73 differential. It's got 265X75R16 tires; which calculates into 32 inch tires. So, I got a Black 32 tooth gear. There is a minor trick to knowing how to reinstall it and there are videos that show that. My speedometer now reads about 2.5 mph higher than I'm actually going; and, as my tires wear down, it should go to 3 or even 3.5 mph higher or more. Hindsight, I would recommend the next size smaller; because, apparently, this chart assumes you want to read a number higher than you're actually going and it doesn't factor in tire wear.
Yeah, I wish I had known this stuff before I did mine. I was thinking of making a video on it; because, I have yet to see a video that takes you thru the entire process, from the chart, to the purchase, to removing the old one, reinstalling the new one; where, you have to rotate the locking bracket; and, then what actually happens out on the road. I've used my Garmin GPS and city mph signs that tell me how fast I'm going and that's how I know, I'm not going as fast as my speedometer says. I have a few videos you can see, all posted in the last 4 months. I've learned a lot, a lot, a lot. Way more than half I had to learn the hard way. Still learning.
What I've been wanting to know is do all Jeep steering wheels have to be rotated, upside down, when installing a lift kit? No one; but, no one ever talks about this.
@@markmahecha8974 do what? I know this is an old comment, but I hope you’re just joking. Larger tires make your acceleration slower at the same gear ratio, but your top end is actually faster since the tire goes farther per rotation.
The tires on my 2014 chevy silverado has stock tires, and I have performed a auto tune with Diablo Sport i3 and i changed the plugs, but now I am driving about 12 miles faster than what my speedometer says, not sure how to fix that
Ok so if I take a truck with a 30” tire already on it and that tire rotates 622 times in a mile. That same truck I put on 50” tire that rotates 404 times a mile. But of course because the bigger tire has a bigger diameter, the engine struggles and the Speedo is wrong. What if I put on portal axles with a low gear ratio to counteract this? Then my speedo is correct and my engine has the same mechanical advantage with the 50” as it did with the 30”. Yes I know the 05” will be heavier and cause the engine to struggle more, but I’m ignoring that for the time being. What do y’all think?
I have a question. So what if I put smaller rims and bigger tires. how does that affect the mileage of your vehicle? Do you rack up more miles faster with a smaller rim?
Assuming your gearing is still stock and your wheel speed sensor isn't located on the inside of your tires toward the middle I don't see how that would work. If you change the tire it's the final moving component of your driveline. Just think: engine - torque converter - transmission - driveshaft - transfer case (may vary depending on vehicle) - differential - axel - hub - rim - tire If the speed sensor is anywhere left in this chain to the tire there's just no way for it to take into account the modification that's been made without being modified or recalibrated to compensate.
It will effect the the end the speed sensor/ cable runs off the transmission so yes the rear tires charge will affect the speed on speedometer some are different example ( the classic VW BEETLE it a MR(mid engine rear wheel drive) the speed cable is ran off the front left so if i change all my tires but left it wont change tell i change the left tire size)
I have a 1994Z 71 I had 16 inch tires on it somebody put 18 zone it will that affect my towing my camper pulling it does not seem like it has power when it comes to a heel is my tires and rims my problems
It was right when you had stock wheel you put bigger wheel now it off you getting a fake reading to put it back to normal you got to it a speed sensor on to fix it
Thinking about making a ebike channel as trying to start a business but I think it's going to be full of me getting flustered and forget what I'm saying 🤣😅
can a wheel genius tell me how does the width of the tire affect the speed ? If I switch from 255 to 265 tire width the speed goes up by 1.2 miles, that`s either a bullshit calculator or I'm missing something
Cause the height of a tire is percentage out of the tire width. Ex : 255/40 r17 the height is 40% x 255 If you change the width, you change the diameter also
I believe tyre size has nothing to do with speedometer. You're getting your reading from gear which still there. If speed sensor is fitted on wheels that time I can say this is true.
I also believe this. Coz the odometer and speedometer could tell us otherwise how much speed there is. It might just affect the fuel consumption of the vehicle coz technically, the larger the wheel, the heavier it is.
Shouldn't u actually be going at a slower speed because your tires are much bigger? It would make more sense for the speedometer to be somewhat correct.
It’s the way the speedometer reads. All your car knows is the tire made 1 rotation. 1 tire rotation travels further with a larger tire. If you put tiny tiny Oreo tires on your car, you car would think it was flying down the road because the tires turning like mad! But you’d be covering very little ground.
JeepSolid so technically your car is going slower than its really supposed to with the larger wheels but the speedometer is reading an even slower speed than that?
Theres a problem with your video. Youre only talking rim size. Rims are not tire sizes. You can get smaller rims with a larger tire size and depending on how big the tire is you can actually prevent it from being off if rim and tire = to the stock tire and rim it came with
@@JeepSolid putting the bigger tires on thow the mph off so you are not going 67mph you really going 60 now you understand gps is what they use it never wrong
It gives you a false reading when you put a big tire on it's gonna say your going faster but you're not so you have to correct it by putting the speed senser in it
I have a 1990 Honda Civic DX Hatchback, original tires were 175x70x13, new rim and tires are 195x50x15. My mechanic kept telling me my speed was off, but thanks to you and Sharing this tool, I can now prove that my cars tire revolutions are just off by 1/10. Thanks again for this calculator, I have been looking for something like this for a while.
You got me in trouble, my fiancé used the calculator and figured out I've probably been going 10 over everywhere with my jeep. I think rough country makes a Speedometer gear that you can swap out if you know your gear ratio.
Haha, sorry man!
You can use a GPS also to check your speed too.
Keep watching my mobile GPS I have 3 speed fines right now :D
Broo those shotgun effects threw me off guard, I am f**** weak 🤣🤣🤣
Is why I got a diablosport tuner for my Challenger and makes it nice for when ya change tires or wheels, you can reset the speedometer or make adjustments whenever you need. I got it primarily for performance tuning, but it is one of the parameter adjustments on it and also let's you reset codes to
I never would have known that. Wow thanks bro!
Cool. Thanks!
Let's of free time size calculator apps you can download. Also many wheel offset calculators available of you want to change wheel sizes and offsets.
On most vehicles it's suggested you stay within a 3% window when changing tire size. Anything more can foul the ABS systems and antilock brakes and vehicle stability control a d traction control. All of those features use wheel speed and detect slipping.
Also in your case an almost 10% larger tires effectively results in a 10% higher gear ratio. It would be equivalent as going from a 3.55 axle ratio down to a 3.27 ratio.
Had a Suzuki Samurai - Loved it. I wouldn't dream of taking it in the mud. Now I own a Smart Fortwo, also a convertible and also Not going in the mud.
Thanks for a great tool! Exactly what I was looking for!
Just because he wasn’t mad at the person who cut him off i subscribed.
I changed out the little plastic speedometer gear in the transfer case. Look up Novak's color coded jeep speedometer gear chart. All you need to know is your differential gear ratio and tire size. My 5.9 ZJ has a 3.73 differential. It's got 265X75R16 tires; which calculates into 32 inch tires. So, I got a Black 32 tooth gear. There is a minor trick to knowing how to reinstall it and there are videos that show that. My speedometer now reads about 2.5 mph higher than I'm actually going; and, as my tires wear down, it should go to 3 or even 3.5 mph higher or more. Hindsight, I would recommend the next size smaller; because, apparently, this chart assumes you want to read a number higher than you're actually going and it doesn't factor in tire wear.
Yep! You're foreshadowing my future video ;) haha... How to fix speedometer.... 👍 Thanks for feedback on how yours went. Good info!
Yeah, I wish I had known this stuff before I did mine. I was thinking of making a video on it; because, I have yet to see a video that takes you thru the entire process, from the chart, to the purchase, to removing the old one, reinstalling the new one; where, you have to rotate the locking bracket; and, then what actually happens out on the road. I've used my Garmin GPS and city mph signs that tell me how fast I'm going and that's how I know, I'm not going as fast as my speedometer says. I have a few videos you can see, all posted in the last 4 months. I've learned a lot, a lot, a lot. Way more than half I had to learn the hard way. Still learning.
Very cool. I'll check out your videos!
I'm more of a mechanic than spokesperson. A bit camera shy. Know nothing about video editing; but, I do know a thing or two.
What I've been wanting to know is do all Jeep steering wheels have to be rotated, upside down, when installing a lift kit? No one; but, no one ever talks about this.
GREAT information, but it doesn't take into account gear ratio?
Great link you shared....big thanks.
No problem. Thanks for watching!
You should make a video on how to calibrate your speedometer on a YJ!
I hope to soon! It's on My list 👍
The only thing this doesn't explain is why I'm still always the slowest vehicle on the road! Lol
Haha, I know. Seems that way.
Actually larger tires make you go slower.... this completely defies the laws of physics.
Yes, I keep feeling that
@@markmahecha8974 do what? I know this is an old comment, but I hope you’re just joking. Larger tires make your acceleration slower at the same gear ratio, but your top end is actually faster since the tire goes farther per rotation.
@@SoreTv i fixed the problem by going up on gears but ended up selling my truck because I needed the money
Loved the bloopers at the end lol best part
what about gas and mpg
What do l need to do to get it to go back to right speed l drive 50 it says 75 that not right since l put tires smaller on my 1998 z28 camero
The tires on my 2014 chevy silverado has stock tires, and I have performed a auto tune with Diablo Sport i3 and i changed the plugs, but now I am driving about 12 miles faster than what my speedometer says, not sure how to fix that
Is it ok to run my my suv with my front tires are 245 70r 16 while the rear is 265 70r16
Ok so if I take a truck with a 30” tire already on it and that tire rotates 622 times in a mile.
That same truck I put on 50” tire that rotates 404 times a mile.
But of course because the bigger tire has a bigger diameter, the engine struggles and the Speedo is wrong.
What if I put on portal axles with a low gear ratio to counteract this?
Then my speedo is correct and my engine has the same mechanical advantage with the 50” as it did with the 30”.
Yes I know the 05” will be heavier and cause the engine to struggle more, but I’m ignoring that for the time being.
What do y’all think?
So all speedometers are calibrated to tire size right? This applies to cars, trucks, motorcycles, 150cc scooters, and electric bikes right?
I'll make sure I look that up on my way to home Depot 😎
Haha..! Yep, all kinda toys there.
can you show it on gps speed meter ??
its 2022, direct tire has taken down the speed calculator portion of the page.. :(
I have 33inch mud tires on my jeep wangler YJ. Haven't regeard yet but plan on it soon. I'm guessing that you haven't either lol
I have a question. So what if I put smaller rims and bigger tires. how does that affect the mileage of your vehicle? Do you rack up more miles faster with a smaller rim?
It all has to do with the circumference of the tires. not the rim
Can u give more millege or not
Any tips on difference in mileage with bigger tires. Wheel size 20x12 on 35' tires seems like I've added miles. Also has a 6in lift kit.
Doesn't that depend on where your speed sensor is located ?
Assuming your gearing is still stock and your wheel speed sensor isn't located on the inside of your tires toward the middle I don't see how that would work. If you change the tire it's the final moving component of your driveline.
Just think:
engine - torque converter - transmission - driveshaft - transfer case (may vary depending on vehicle) - differential - axel - hub - rim - tire
If the speed sensor is anywhere left in this chain to the tire there's just no way for it to take into account the modification that's been made without being modified or recalibrated to compensate.
I have a 1998 z28camero l put small tires now my speed don't show same
I have a question, I had 215/60/16 and change it to 235/35/20 and it went from 33mpg to 20mpg, why is that?
Wider tires get you more traction but at the cost of fuel economy since you need more power to move, maybe also weight of your new ones?
My 95 yj is 7.7 mph off.... yikes! Good video.... this helps!
Yeah, there's an easy fix with the speed sensor on transfer case. Video soon.... I hope (lots going on)
hey dude ! thanks for sharing the tire size conversion chart tool but is it 100% legit and accurate ???
Yeah. I believe so. There’s other calculators you can check as well
@@JeepSolid such a great tool if it is ! no other way to measure this really but the website
It’s math it has to be
Going 1 size higher effect your trans ?? Or gear?
Cool tip dude! Thanks!
So does that mean your odometer would display less miles than actually driven? 🤔
Yep
yes for sure , if u change ur overall circumference
increase the rims lower the tire profile , just make sure the circumference doesn't increase or decrease
I have a GTO which is rear wheel drive -dah- , and i changed the front wheels/Tyres only.. would this also affect my speedometer? Im confused:s
It will effect the the end the speed sensor/ cable runs off the transmission so yes the rear tires charge will affect the speed on speedometer some are different example ( the classic VW BEETLE it a MR(mid engine rear wheel drive) the speed cable is ran off the front left so if i change all my tires but left it wont change tell i change the left tire size)
I have a 1994Z 71 I had 16 inch tires on it somebody put 18 zone it will that affect my towing my camper pulling it does not seem like it has power when it comes to a heel is my tires and rims my problems
...no
Thanks for sharing.👍👍
Where can you calibrate the Speedometer? I have recently changed my wheels and it reads 80mph when im actually going 70mpg...
Aiden Suh thats some great mpg at 80mph, whats your gear ratio?
@@Schnozwangler 😐😂
How does tire size effect odometer reading and where is that calculator :)
Thanks, good vid!
Excellent! Thumbs up!
So does this affect the mileage too?!
Yeah
But why are they throwing off a faster reading?
Another thing to keep in mind is this also affects your odometer.
First thing he mentions...
Did you carpet the inside of your hard top? That would be a sweet video.
There is headliner in the top. I didn't install it, but I do need to make some repairs on it. Maybe future video.
Is that only if your tires were so aired up they were perfectly round as you drive?
It was right when you had stock wheel you put bigger wheel now it off you getting a fake reading to put it back to normal you got to it a speed sensor on to fix it
Wow yeah thank you
Thinking about making a ebike channel as trying to start a business but I think it's going to be full of me getting flustered and forget what I'm saying 🤣😅
Would it affect my truck if I use of road tires to pull a trailer
No
Good video, helpful info, great edits 👍🇺🇸
Thank you
Dope vid helped a lot
My fictional character is a truck guy in my story, so here I am doing some more research.
I drive past them speedo readers all the time and I got 33s on my 94 gmc my speedo says 60 and so does the radar
What about changing gear ratios? Does this change your indicated speed?
Yeah. I'm planning a video on gear ratio and speed sensor
Good man easy mate thanks 👍
No problem.
Solved a discussion
The speed difference is less at lower speeds and higher with higher speeds. So might be 9 at 60 but could be 11 at 70 or so....
Thanks in big way
how did it affect your gear ratio?
Gear ratio is the same, but I need to get a new speed sensor.
Are u pralaize bro ?
Kudos
Speed odermeter is going faster since l put new tires smaller on my 1998z28 camero
can a wheel genius tell me how does the width of the tire affect the speed ? If I switch from 255 to 265 tire width the speed goes up by 1.2 miles, that`s either a bullshit calculator or I'm missing something
Cause the height of a tire is percentage out of the tire width. Ex : 255/40 r17 the height is 40% x 255
If you change the width, you change the diameter also
Same on motorcycles?
Concept should be the same
Thank you
tiresize.com/calculator/ is this also a good site to compare? JeepSolid
JeepSolid help me pls :(
Aha I knew it I felt I was going a little faster than other cars.
Haha! Yep
well this partly explains my poor mpg.....ive been going 80 everywhere
Haha!! So true
But when you do that the engine heat up to the boiling level with bigger tires !!!
I think at this point, I'd recalibrate my speedometer.
down load the odometer app on your phone
I believe tyre size has nothing to do with speedometer. You're getting your reading from gear which still there. If speed sensor is fitted on wheels that time I can say this is true.
I also believe this. Coz the odometer and speedometer could tell us otherwise how much speed there is. It might just affect the fuel consumption of the vehicle coz technically, the larger the wheel, the heavier it is.
Coffee! ☕
Actually larger tires make you go slower.... this completely defies the laws of physics.
Is magic. Haha! So, yeah. The larger tires make your speedometer read slower than you're actually going
This magic 👍🤔😇📝⏳ perfect
Shouldn't u actually be going at a slower speed because your tires are much bigger? It would make more sense for the speedometer to be somewhat correct.
It’s the way the speedometer reads. All your car knows is the tire made 1 rotation. 1 tire rotation travels further with a larger tire. If you put tiny tiny Oreo tires on your car, you car would think it was flying down the road because the tires turning like mad! But you’d be covering very little ground.
JeepSolid so technically your car is going slower than its really supposed to with the larger wheels but the speedometer is reading an even slower speed than that?
I have 28x10” tires and 3.73 gears and my speedometer is reading 15mph too fast 🤣
Mine reads 20 over
That’s small
Theres a problem with your video. Youre only talking rim size. Rims are not tire sizes. You can get smaller rims with a larger tire size and depending on how big the tire is you can actually prevent it from being off if rim and tire = to the stock tire and rim it came with
The calculator uses tire size.
Super easy just download a speed app on your smart phone and then compare it to your speedometer
In my camry 2019 Im going lets say 20 and when I checked it was actually 17 what thaa
People must think you're a very safe driver 👍
The bigger tires only saying you going faster but you are not
Kermit sounds great
Only trying to help
Yes. Thank you Kevin
No you really going the right speed it says you going 69 but you really going 60 mph you got it all backwards turn your gps on it will tell you
That’s why people change speed sensors for different size tires. But don’t have to believe me. Look it up 👍🏼
@@JeepSolid been there done that
@@JeepSolid putting the bigger tires on thow the mph off so you are not going 67mph you really going 60 now you understand gps is what they use it never wrong
It gives you a false reading when you put a big tire on it's gonna say your going faster but you're not so you have to correct it by putting the speed senser in it
Lol. Made it!!
Nice!
Kill two birds one stone. Easy big stone little birds
You are not going faster use gps
69 mph...
H M M M M
Nice...