What gear ratio do I need for bigger tires?
But the easiest way to figure out the right ratio is to lower it the same percentage you increased the tire diameter over stock. For example, imagine your 4×4 came from the factory with 32-inch tires and 4.10 axle gears. Upgrading to 37-inch tires would calculate to about a 16 percent increase in tire diameter.
How do you determine the gear ratio of a tire?
Here’s the formula for calculating gear ratio: (RPM x Tire Diameter Inches) / (Final Drive Ratio x Transmission Gear Ratio x 336) = Actual numerical gear ratio to the ground from every revolution of the engine.
Does gear ratio change with tire size?
So if you have a 3.73:1 gear ratio the drive shaft turns 3.73 times for every turn of the wheel. Changing tire size affects the final drive ratio. Switching from a 30″ tire to a 35″ tire changes the final drive ratio by about 17%.
How do I calculate my gear ratio?
The gear ratio is calculated by dividing the output speed by the input speed (i= Ws/ We) or by dividing the number of teeth of the driving gear by the number of teeth of the driven gear (i= Ze/ Zs).
What gears should I run with 35 inch tires?
Gear Ratio And Tire Size Calculator
| 3.31 | 4.56 | |
|---|---|---|
| 34″ | 2126 | 2929 |
| 35″ | 2065 | 2845 |
| 36″ | 2008 | 2766 |
| 37″ | 1954 | 2692 |
What gears should I run with 40 inch tires?
Gear Ratio And Tire Size Calculator
| 3.31 | 4.88 | |
|---|---|---|
| 39″ | 1854 | 2733 |
| 40″ | 1807 | 2664 |
| 41″ | 1763 | 2599 |
| 42″ | 1721 | 2538 |
How does tire size affect axle ratio?
When taller tires are installed on a truck but the axle ratios stay the same; the effective gear ratio is reduced. This means the engine is forced to operate below its power band, and performance and fuel economy suffer as a result.
How many teeth do 3.55 gears have?
39-11 Teeth
Technical Details
| Manufacturer | Motive Gear |
|---|---|
| Brand | Motive Gear |
| Model | Motive Gear D35-355 Rack and Pinion, 39-11 Teeth, 3.55 Ratio |
| Item Weight | 11.44 pounds |
| Product Dimensions | 15.5 x 11 x 5.25 inches |
How much will tire size affect gear ratio?
generally 1 inch in tire diameter eqauls 1/10 gear ratio , so a 1 inch shorter tire would put the gearing at 2.83. some cheap/free 3.08’s would do more good than tires.
What is the formula to calculate gear ratio?
They are introduced to the concept of ratio as a way to express these relation- ships. Students derive the formula for finding the gear ratio of a pair of gears: gear ratio = teeth in driven gear/teeth in driver gear.
Does tire size affect gear ratios?
Gear Ratio and Tire Size The gear ratio is not only affected by the axle, but also the tire size . If your vehicle has a low gear ratio, you can offset this by installing slightly larger diameter tires. For example, a vehicle with a 4.10 axle with 30.2 inch diameter tires will have a new gear ratio of 3.97 with 31.2 inch diameter tires installed.
How do you calculate tire ratio?
To calculate the effective drive ratio of the new tires, multiply the diameters together, then multiply that figure by the gear ratio as follows: 26/28 = .92857142857. .92857142857 x 3.55 = 3.2964 or 3.30. As you can see, the larger tires reduce your final drive ratio to 3.30—a measurable difference.