omix-ada home
monthly updates

When you change your tire size you need to make sure you have the right gearing to get optimal fuel economy and power. A good way to calculate this is to mutiply .12 by your Jeeps tire diameter (Example: .12 X 38" = 4.56). Here at Omix we have a made an easy to read chart for you to get a good estimation on the best gearing for your Jeep. The three distinct colors below can help you decide what is the right gearing for you...

  • Green = Best MPG, this is what you would want to get for the best fuel economy and highway cruising.
  • Brown = Best Overall, this is good mix of power/MPG and considered best for daily driving.
  • Orange = Best Power, this will give you the best performance for towing power, but at the cost MPG.

These calculations are assuming a manual transmission at 65 MPH with a gear ratio of 1:1. If you drive an automatic your RPMs will be slightly higher,and if you have overdrive your RPMs will be slightly lower.

Best MPG
Best Overall
Best Power

gear ratio versus tire size chart

Catalogs | Contact

omix-ada-intl.Com © 2011 | Disclaimers | Privacy Policy

Jeep®, Wrangler™, Cherokee™, Grand Cherokee™, JK™, TJ™, YJ™, CJ™, Jeep® grille design and other names used in this catalog are registered trademarks of Chrysler LLC. Omix-ADA® or its licensees are not affiliated with Chrysler LLC. All parts listed are aftermarket replacement parts. Part numbers, illustrations and images used for reference purpose only. No implication is made that these are original equipment parts, from those sources whose part numbers are used here for reference or that they are approved by those companies. Omix-ADA®, Rugged Ridge® and Outland® names and logos are registered trademarks of Omix-ADA, Inc. Alloy USA™ and Precision Gear™ names and logos are trademarks of Omix-ADA, Inc.®