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!

Read more »

4x4 Truck Tires for sale on eBay

4 NEW 35X12.50-20 Thunderer Trac Grip 2 MT Tires 35 12.50 20 12.50R20 Mud Tires

Tuesday December 19, 2017

$785.00
End Date: Thursday Aug-16-2018 13:21:14 PDT
Buy It Now for only: $785.00
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4 New 33X12.50-18 Thunderer TRAC GRIP M/T MUD 12.50R R18 Tires

Thursday October 12, 2017

$716.00
End Date: Wednesday Aug-8-2018 12:52:23 PDT
Buy It Now for only: $716.00
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4 NEW 35x12.50R18 Centennial Dirt Commander M/T Mud Tires MT 35 12.50 18 R18

Tuesday June 12, 2018

$776.00
End Date: Saturday Aug-11-2018 8:02:49 PDT
Buy It Now for only: $776.00
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4 NEW 33x12.50R20 Centennial Dirt Commander M/T Mud Tires MT 33 12.50 20 R20 LRF

Friday March 23, 2018

$744.00
End Date: Saturday Jul-21-2018 6:57:03 PDT
Buy It Now for only: $744.00
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4 NEW LT33x12.50-20 Ginell MT TIRES 10 Ply Mud 33/12.50R20 R20 1250 OFFROAD

Thursday May 25, 2017

$697.00
End Date: Thursday Jul-19-2018 10:18:42 PDT
Buy It Now for only: $697.00
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4 NEW 33x12.50R17 Centennial Dirt Commander M/T Mud Tires MT 33 12.50 17 R17

Wednesday June 27, 2018

$690.00
End Date: Friday Jul-27-2018 10:21:26 PDT
Buy It Now for only: $690.00
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4 NEW 35x12.50R20 Centennial Dirt Commander M/T Mud Tires MT 35 12.50 20 R20 LRF

Monday May 14, 2018

$796.00
End Date: Sunday Aug-12-2018 8:44:01 PDT
Buy It Now for only: $796.00
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4 New Thunderer Trac Grip M/T Mud Tires 2857516 285/75/16 28575R16 10 Ply E Load

Thursday July 20, 2017

$548.00
End Date: Tuesday Aug-14-2018 1:12:45 PDT
Buy It Now for only: $548.00
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4 New Federal Couragia M/T Mud Tires - 33X12.50R20 33 12.50 20 33125020 10PR

Friday October 27, 2017

$738.38
End Date: Tuesday Jul-24-2018 15:24:20 PDT
Buy It Now for only: $738.38
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4x4 Truck Wheels for sale on eBay

17" DODGE RAM 1500 FACTORY ALLOY WHEELS (4) TAKEOFFS FREE SHIPPING

Monday July 16, 2018

$395.00
End Date: Wednesday Aug-15-2018 10:15:03 PDT
Buy It Now for only: $395.00
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Ford F-150 Truck 17 inch 2015 2016 2017 Factory OEM Wheel Rim FL341007AA #F108

Tuesday July 17, 2018

$80.00
End Date: Thursday Aug-16-2018 12:01:40 PDT
Buy It Now for only: $80.00
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13 14 15 16 Dodge Ram 1500 Truck Alloy Rim Wheel 20" USED 2454 1UB19TRMAC CHROME

Tuesday July 17, 2018

$209.99
End Date: Thursday Aug-16-2018 12:31:24 PDT
Buy It Now for only: $209.99
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20x8.5 Rims Tires Fit Ford Trucks Expedition Chrome Wheels 3788 GY Tires

Tuesday July 17, 2018

$1,489.00
End Date: Thursday Aug-16-2018 14:48:04 PDT
Buy It Now for only: $1,489.00
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NEW Chevrolet Silverado 2016 18 OEM Rim Wheel 5647 20937966 Sierra 2014 15 17 18

Monday July 02, 2018

$135.00
End Date: Wednesday Aug-1-2018 16:14:58 PDT
Buy It Now for only: $135.00
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24x10 Rim Fit GM Chevy Truck GMC Sierra Yukon Denali Style Chrome Wheel CP SET

Tuesday July 17, 2018

$1,569.00
End Date: Thursday Aug-16-2018 8:18:15 PDT
Buy It Now for only: $1,569.00
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24 inch Chevy Silverado 1500 OE Factory Replica Wheels 5656 GMC Sierra Rims 2014

Thursday May 31, 2018

$1,189.00
End Date: Monday Jul-30-2018 10:21:42 PDT
Buy It Now for only: $1,189.00
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Chevy Tahoe Wheels 24" inch 2014 2015 GMC Sierra Satin Black Rims Tahoe Suburban

Wednesday August 24, 2016

$1,159.00
End Date: Tuesday Aug-14-2018 11:31:07 PDT
Buy It Now for only: $1,159.00
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22" inch GMC Yukon OE Replica Wheels Chrome Rims 22x9" 2014 2015 GMC Sierra 1500

Saturday June 17, 2017

$1,179.00
End Date: Saturday Aug-11-2018 6:51:39 PDT
Buy It Now for only: $1,179.00
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