Cooler 4x4 Trucks
More OffRoad Freedom!

Offroad Tire Size Calculator

Truck Tire Size, Gear Ratio and Crawl Ratio Calculator

These calculators helps in your decision making while planning modifications for your newest project. It will answer questions like:

  • What differential gear ratio do I need for my new larger tires?
  • How do I convert metric tire size to inches?
  • What is my overall gear ratio?

Bookmark this page for easy reference!

When you get larger tires you have to lower the gear ratio to preserve fuel consumption. This 4x4 Calculator can help you to find the gear ratio closest to the original setup.

Converting from metric tire size to the more common inches used in those larger 4-wheeling tires can be handy.

High overall crawl ratio means you can go slower - that transforms into better off road capabilities.

Thrandur Arnthorsson
Thrandur is the chief-editor and owner of 4x4 Off Roads and an 4x4 off road enthusiast. Living in Iceland he loves to share the coolest 4x4 trucks and supporting more offroad freedom. If you want to get YOUR 4x4 featured on 4x4OffRoads you can post your story here.

Tire Size Articles

Gear Ratio Chart: Step-by-step

Gear Ratio Chart: Step-by-step

Simple guide to choosing the best diff gear ratios for your Jeep or 4x4 truck

The correct chart for your gear ratio is important for drivability and economy. When you increase the tire size without changing the gear ratio you increase fuel consumption and you can not drive at the low speeds needed for the off roads.

Read more »


4x4 Offroad Tires!

4x4 Offroad Tires!

How to select the perfect 4x4 offroad tire?

Belief it or not, after the truck it self, the off road tires along with the appropriate wheels are the most important ingredient to a good usable 4x4!

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