Gear Calculator

Our gear calculator is a powerful tool to help you determine the optimal gear ratio for your vehicle. By giving us some basic information about your vehicle and desired performance, we will provide you with a customized gear ratio recommendation.

For the best gear ratio and off-road auto repair services in Grand Junction, Colorado, give us a call today!

Find new Gear Ratio with new tire size

For those new to the off-road scene or who may need to be better-versed in the mechanics of their truck’s axles, the concept of adjusting gear ratios may be unfamiliar. However, altering the gear ratios can significantly impact the relationship between the driveshaft and wheel revolutions.

By lowering the gear ratio (which may seem counterintuitive as the number is actually larger), the engine’s revolutions per minute (RPMs) will increase, assuming constant tire diameter and speed. This adjustment can have a noticeable effect on the vehicle’s performance in off-road scenarios.

At Barney Brothers Off Road & Repair, we have extensive knowledge about the effects of adding taller tires to your truck or SUV. While it may seem like a good idea to increase the tire circumference, there are several important factors to consider.

The larger tires’ circumference allows the vehicle to travel a greater distance at the same engine RPM. However, the increased space between the ground and the axle center point can lengthen the leverage arm, decreasing the amount of force applied at the end of the arm. This reduces the torque to the ground at the tire’s contact patch, making it more difficult to move a heavier wheel-and-tire combo, which demands more torque and, consequently, more fuel.

As the leading experts in the industry, we have observed that adding larger tires to your truck seldom improves economic or acceleration performance, except in the case of diesel trucks. However, even in diesel trucks, the effects of adding slightly taller and heavier tires are usually negligible, and it is essential to consider other factors before modifying your vehicle. At Barney Brothers Off Road & Repair, we can guide you through the decision-making process to ensure that any modifications you make to your vehicle will positively impact performance and reliability.

To find the correct gear ratio for your differential simply give us a call at (970) 243-9300 today.

Barney Brothers Off Road and Repair Gear Ratio Color coded chart with tire size compared to better gas mileage in yellow tracking ratio numbers, near factory ratio numbers in green and more power numbers in orange


Manual Transmissions

manual transmission ratios

Automatic Transmissions

automatic transmissions ratios

Popular Transfer Case Ratios

Popular Transfer Case Ratios



Got Questions or Problems?
Trust Barney Brothers Off Road & Repair for a Solution

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Contact the Mechanics at Barney Brothers
Off Road & Repair

Located in Grand Junction, CO 81505

At Barney Brothers Off Road & Repair, we are proud to offer full-service auto repair, off-roading accessories and upgrades, and overlanding builds. We are your local center for all your automotive needs.

Don’t hesitate to reach out to our team. Call us at (970) 243-9300 or stop by to see us at 2394 Hwy 6&50, Grand Junction, CO 81505.