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 35X12.50R20 Federal Couragia Mud Tires M/T 35125020 R20 1250 12.50 35 20

Wednesday July 19, 2017

$860.00
End Date: Tuesday May-15-2018 16:13:19 PDT
Buy It Now for only: $860.00
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4 NEW 33x12.50R18 Centennial Dirt Commander M/T Mud Tires MT 33 12.50 18 R18

Wednesday March 21, 2018

$756.00
End Date: Sunday May-20-2018 13:05:53 PDT
Buy It Now for only: $756.00
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4 New Atturo Trail Blade MT Mud Tires - 33X12.50R20 33 12.50 20 33125020

Friday October 27, 2017

$873.92
End Date: Wednesday Apr-25-2018 12:55:36 PDT
Buy It Now for only: $873.92
Buy It Now | Add to watch list

4 NEW 35x12.50R20 Kanati Trail Hog LT Tires 35 12.50 20 R20 3512.5020 10 ply

Tuesday August 30, 2016

$888.00
End Date: Tuesday May-22-2018 9:35:07 PDT
Buy It Now for only: $888.00
Buy It Now | Add to watch list

4 New 33x12.50R15 Inch Crosswind Mud Tires 33125015 12.50 33 1250 15 M/T MT R15

Tuesday October 18, 2016

$624.00
End Date: Friday May-11-2018 14:04:29 PDT
Buy It Now for only: $624.00
Buy It Now | Add to watch list

4 New 35x12.50R17 Inch Crosswind Mud Tires 35125017 12.50 35 1250 17 M/T MT R17

Thursday September 28, 2017

$748.00
End Date: Thursday Apr-26-2018 13:26:22 PDT
Buy It Now for only: $748.00
Buy It Now | Add to watch list

4 NEW 33x12.50R20 Kanati Mud Hog M/T Mud Tires MT 33 12.50 20 R20 10 ply 33 1250

Sunday September 04, 2016

$756.00
End Date: Friday Apr-27-2018 9:17:43 PDT
Buy It Now for only: $756.00
Buy It Now | Add to watch list

4 New Federal Couragia M/T Mud Tires - 33X12.50R20 33 12.50 20 33125020 10PR

Friday October 27, 2017

$760.76
End Date: Wednesday Apr-25-2018 15:24:20 PDT
Buy It Now for only: $760.76
Buy It Now | Add to watch list

33x12.50R20 Kanati Mud Hog M/T Mud Tires New LRE/10Ply *Set of 4*

Tuesday April 17, 2018

$748.00
End Date: Thursday May-17-2018 9:03:36 PDT
Buy It Now for only: $748.00
Buy It Now | Add to watch list

4x4 Truck Wheels for sale on eBay

2014 2015 GMC Sierra 1500 20 inch Wheels Satin Black Rims 20x9" fit Chevy trucks

Wednesday March 08, 2017

$799.00
End Date: Wednesday May-2-2018 6:02:05 PDT
Buy It Now for only: $799.00
Buy It Now | Add to watch list

20 inch Chevy Silverado 1500 Snowflake OE Replica Wheels 20x9" Rims Satin Black

Tuesday April 11, 2017

$929.00
End Date: Sunday May-6-2018 12:26:16 PDT
Buy It Now for only: $929.00
Buy It Now | Add to watch list

22.5x8.25 Forged Aluminum Hub Pilot Truck Wheel

Tuesday May 16, 2017

$219.00
End Date: Friday May-11-2018 4:32:19 PDT
Buy It Now for only: $219.00
Buy It Now | Add to watch list

New set 16" 8 Lug Alloy Wheels Rims fits 1988-2010 Chevy Silverado 2500 3500 HD

Thursday May 22, 2014

$488.00
End Date: Tuesday May-1-2018 6:38:15 PDT
Buy It Now for only: $488.00
Buy It Now | Add to watch list

03026 Refinished Ford F150 Truck 1992-1996 15 inch Black Steel Wheel, Rim

Tuesday October 17, 2017

$45.26
End Date: Tuesday May-15-2018 7:13:37 PDT
Buy It Now for only: $45.26
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4 NEW 2015 GMC Wheels 22x9 Hyper Silver OE Yukon Sierra Silverado Denali Tahoe

Wednesday April 27, 2016

$940.00
End Date: Thursday May-17-2018 8:35:07 PDT
Buy It Now for only: $940.00
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18x10 PVD Black Chrome 2015 Mustang GT Style Wheel 18" Fits Ford

Wednesday July 05, 2017

$99.75
End Date: Tuesday May-1-2018 13:13:01 PDT
Buy It Now for only: $99.75
Buy It Now | Add to watch list

GMC/CHEVY TRUCK-VAN 16" 8 LUG ON 6.5" STEEL WHEELS AND TIRES - (OEM)

Tuesday March 24, 2015

$675.00
End Date: Monday May-7-2018 4:57:57 PDT
Buy It Now for only: $675.00
Buy It Now | Add to watch list

20" inch Chevy Tahoe LTZ (5308) OE Factory Replica Wheels Polished Aluminum Rims

Thursday March 22, 2018

$819.00
End Date: Monday May-21-2018 11:30:44 PDT
Buy It Now for only: $819.00
Buy It Now | Add to watch list

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