im using gear drive for an elecric skateboard... only had 2 ratios for the 3 tire sizes i have... PERFECT VIDEO EXACTLY WHAT I WAS LOOKING FOR .. 3.5 IS WHAT I NEED TO SET THE GEAR DRIVE ON WITH 150 MM TIRES LOL TY SO MUCH
My current set up is 3.50’s in my Dana 44 and my Chrysler 9.25 rear axles and I have 33’s right now and my truck is extremely slow. Especially accelerating. I think the first thing I will do is get the gears swapped to bigger than I should and go to 4.10’s.
When I did my lift and tires 14 years ago, I went from 28 inch tires to 31 and had a gear ratio of 3.27 in the rear. Per this math I should get 3.62 new gear ratio (closest would be 3.72). I made a guess at the gears I should put in and chose 4.11 gears on a 5 speed manual tranny. I have issues with keeping up with traffic from a dead stop, keeping up to speed on hills and CANNOT tow worth a damn with this gearing choice. I have to press the pedal 3/4 to Wide Open Throttle while towing and this was with a 5x10 trailer with minimum items on it. I would have been better suited at 4.56 for gear choices according to the tables that are out there. If I followed this math, I'd be in a worse position than I already am.
It sounds highly likely that you have other issues going on. The higher the gear ratio, the more quickly you will accelerate. Basic physics. The flip side is the gear will "run out" sooner and your overall top speed will be slower. Perhaps an analogy..... Think of riding a bike with more than one gear. Say a mountain bike.... If you're in 1st gear, you have so much torque that you pull up a wheelie just by pedaling; however, your max speed is going to be super slow. Every time you go up in gear (larger tire size....numerically smaller rear end gear) you have to push harder to get going, but you're able to go faster with the same amount of pedal strokes.
Really good video sir. I have one question please, I'm changing the tires in my car, I had 265 wide and now it is 325 wide, the tall is about the same in both cases, my question is if this calculation is also useful considering the tire width instead of the height, thank you very much!
going from 18" to 20" with 3.15 gears would require an update rear gear to 3.5. my question is, do i need to calibrate the speedo or will it be reading it correctly w mph and distance travelled.
Went through a dozen videos to figure this out. My Bronco II has 26.5 inch stock tires and 3 stock final drives. Now it has a set of 29s and I have been having issues with shifting. Been looking to change the final drive but couldn't find ANYTHING on the math. This guy has it broke down to where even a dummy like me can figure it out.
Easy math..take a tape measure around the outside of the new tires..ok now the old tire..divide by the number..ok lets look at this example .09 or 9 percent difference..at 100 miles a hour your speedometer will be 9 percent lower of 91 mph..ok on drive train..9 percent less power to the wheels..1000 ft lbs of torque 9 percent less..etc..but the advantage may be a more durable tire like a 19.5 instead of 16 inch tire..rewatch the video, in math each side of the equation is the same..so the only variable is tire size..
Algebra 👍😉 Base your whole mindset on the rear axle as if you only had a 2wd 2x4 rear wheel drive. 1)Choose rear tires 2)Choose front tires 3)Choose rear gear 4) figure out the corresponding front gear ratio to match the rear Edit: actually just do this 👇😁👇 It's the same thing. Watch "How to Choose Your Axle Gear Ratio" on TH-cam th-cam.com/video/oDVpyhKEbaw/w-d-xo.html In the video he shows you how to figure it out assuming you installed larger tires and he shows you how to "correct it" back to stock by gearing appropriately. It's exactly the same as you want to do. You're trying to match different gears and tires so everything is still happy. Substitute his BEFORE gear and tires to his AFTER gear and tires With your: FRONT gear and tires To your REAR gear and tires. That's it. There are 4 variables: Front tire Front gear Rear tire Rear gear As long as you have 3 of those you can figure out the missing variable. You can also flip this math around to figure out tire sizes to match the gearing if you have the gears 1st. Reply back to this if you need help.
Hi Good information thank you for I wonder if you could help me with something I have tires 27 I increase to 31 My ratio is 5.12 It's a Geo tracker 1996 I use your calculation and it gives me 5.88 When I try to buy one nobody seemed to know what I'm talking about Do I mind doing something wrong can you help Me find the right ratio?
Is it possible for a truck to come from the factory with a gear ratio that doesn't match the stock tires? My truck came with 3.31 gears and 32" tires. Seems like that gear ratio is a bit small for that size of tire...
This math didn't work for me. I have 35-12.50. Stock tire is 31.9. And I have 3.55 gears by your math I need 3.08. By my math I need 3.88. So I'm going with 3.73 or 4.10. I haven't decided yet
FASTER IN THE END YES... TORQUE WILL SUFFER,,,JUST DEPENDS ON HOW U DRIVE ..sorry bout caps lol.... just a matter of perference...the correc gear ratio i just balnced speed and acceleration
Brilliant and simple,,,just what I was looking for
Simple and straight to the point. I love it.
im using gear drive for an elecric skateboard... only had 2 ratios for the 3 tire sizes i have... PERFECT VIDEO EXACTLY WHAT I WAS LOOKING FOR .. 3.5 IS WHAT I NEED TO SET THE GEAR DRIVE ON WITH 150 MM TIRES LOL TY SO MUCH
You explained it perfectly
I remember this guy on his show on Spike TV.
My current set up is 3.50’s in my Dana 44 and my Chrysler 9.25 rear axles and I have 33’s right now and my truck is extremely slow. Especially accelerating. I think the first thing I will do is get the gears swapped to bigger than I should and go to 4.10’s.
4:56
Back when PowerNation was still cool 😢
I love this video
This is a great video. Really helpful for a knucklehead like myself.
.12 x the tire diameter will give you the ratio you need , choose the closest ratio from factory
simple and handy
Jesus does he drive his car with his head out the window
😂😂😂😂😂
Show bizzz baby😂
No but he does comb his hair with a hand grenade
Hey he has bad ass hair ok 😂. You don't like it, MOVE IT ALONG BUDY 😂
When I did my lift and tires 14 years ago, I went from 28 inch tires to 31 and had a gear ratio of 3.27 in the rear. Per this math I should get 3.62 new gear ratio (closest would be 3.72). I made a guess at the gears I should put in and chose 4.11 gears on a 5 speed manual tranny. I have issues with keeping up with traffic from a dead stop, keeping up to speed on hills and CANNOT tow worth a damn with this gearing choice. I have to press the pedal 3/4 to Wide Open Throttle while towing and this was with a 5x10 trailer with minimum items on it. I would have been better suited at 4.56 for gear choices according to the tables that are out there. If I followed this math, I'd be in a worse position than I already am.
It sounds highly likely that you have other issues going on. The higher the gear ratio, the more quickly you will accelerate. Basic physics. The flip side is the gear will "run out" sooner and your overall top speed will be slower.
Perhaps an analogy.....
Think of riding a bike with more than one gear. Say a mountain bike....
If you're in 1st gear, you have so much torque that you pull up a wheelie just by pedaling; however, your max speed is going to be super slow. Every time you go up in gear (larger tire size....numerically smaller rear end gear) you have to push harder to get going, but you're able to go faster with the same amount of pedal strokes.
Really good video sir. I have one question please, I'm changing the tires in my car, I had 265 wide and now it is 325 wide, the tall is about the same in both cases, my question is if this calculation is also useful considering the tire width instead of the height, thank you very much!
Nope
going from 18" to 20" with 3.15 gears would require an update rear gear to 3.5. my question is, do i need to calibrate the speedo or will it be reading it correctly w mph and distance travelled.
Went through a dozen videos to figure this out. My Bronco II has 26.5 inch stock tires and 3 stock final drives. Now it has a set of 29s and I have been having issues with shifting. Been looking to change the final drive but couldn't find ANYTHING on the math. This guy has it broke down to where even a dummy like me can figure it out.
Easy math..take a tape measure around the outside of the new tires..ok now the old tire..divide by the number..ok lets look at this example .09 or 9 percent difference..at 100 miles a hour your speedometer will be 9 percent lower of 91 mph..ok on drive train..9 percent less power to the wheels..1000 ft lbs of torque 9 percent less..etc..but the advantage may be a more durable tire like a 19.5 instead of 16 inch tire..rewatch the video, in math each side of the equation is the same..so the only variable is tire size..
HOW ... do I figure axle ratio using bigger tires on back, smaller on front with 4x4 drive? my question applies to an ATV
Algebra 👍😉
Base your whole mindset on the rear axle as if you only had a 2wd 2x4 rear wheel drive.
1)Choose rear tires
2)Choose front tires
3)Choose rear gear
4) figure out the corresponding front gear ratio to match the rear
Edit: actually just do this
👇😁👇
It's the same thing.
Watch "How to Choose Your Axle Gear Ratio" on TH-cam
th-cam.com/video/oDVpyhKEbaw/w-d-xo.html
In the video he shows you how to figure it out assuming you installed larger tires and he shows you how to "correct it" back to stock by gearing appropriately. It's exactly the same as you want to do. You're trying to match different gears and tires so everything is still happy.
Substitute his BEFORE gear and tires to his AFTER gear and tires
With your:
FRONT gear and tires
To your
REAR gear and tires.
That's it.
There are 4 variables:
Front tire
Front gear
Rear tire
Rear gear
As long as you have 3 of those you can figure out the missing variable.
You can also flip this math around to figure out tire sizes to match the gearing if you have the gears 1st.
Reply back to this if you need help.
You don't
Sounds like a one-way-ticket to a lot of damage to me.
What gear radio would be good for the mud got about 500hp with 37 boggers
Hi Good information thank you for I wonder if you could help me with something I have tires 27 I increase to 31 My ratio is 5.12 It's a Geo tracker 1996 I use your calculation and it gives me 5.88 When I try to buy one nobody seemed to know what I'm talking about Do I mind doing something wrong can you help Me find the right ratio?
So if my Jeep has 31 tires and I put 33 on and my gear ratio is 3.43 it only goes to 3.65 hears doesn’t sound rite
Is 325lb ft torque good for larger tires?
My vehicle
2008 nissan navara d40
33 12.50 15 inch tire
Ring & pinion Which fits ???
Can you link ?
I'm from Turkey Istanbul
Wat gear ratio should o be running on 33.5?
Wat r u diving?
Does it affect by the transmission ratio? I mean 1st 2nd 3rd..... ratios?
It does not. Think of it as a filter applied over all those ratios afterwards.
Is it possible for a truck to come from the factory with a gear ratio that doesn't match the stock tires? My truck came with 3.31 gears and 32" tires. Seems like that gear ratio is a bit small for that size of tire...
What about tractor tires?
4.56 gears 35x12.50r17?
It depends
How did you get this result? I get this result 3,9.
Looks like he’s skydiving
lmfao
the face: 😊 the hair: 😠
This math didn't work for me. I have 35-12.50. Stock tire is 31.9. And I have 3.55 gears by your math I need 3.08. By my math I need 3.88. So I'm going with 3.73 or 4.10. I haven't decided yet
It’s correct but you calculated wrong. I just did the calculation and it shows 4.008, round it to 4.10
2005 called.. they wanted their spiked up hair back
hmm i changed to bigger tires now my car is faster.. soooo im not gonna change anything hhh
FASTER IN THE END YES... TORQUE WILL SUFFER,,,JUST DEPENDS ON HOW U DRIVE ..sorry bout caps lol.... just a matter of perference...the correc gear ratio i just balnced speed and acceleration