Three Jeep Wranglers crawling up a red slickrock trail

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Diagnose issues, plan upgrades, calculate specs and inspect used Jeeps, ATVs and UTVs with free tools.

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Diagnose a ProblemJeep won't start or a warning light is on? Common causes in the order to check them. Tire & Lift ImpactBigger tires or a lift: real diameter, speedometer error and the gear ratio to restore stock feel. Plan Your BuildA free tire upgrade checklist: what to check before you buy tires, wheels or gears. Inspect a Used JeepCommon problems and what to expect before you buy. A full checklist tool is coming. All CalculatorsTire size, regear, air-down PSI, winch size, backspacing, fording depth and more.
Suryashankar Dasgupta, owner of Off-Road Handbook, riding an ATV

About Me

Hello, I am Suryashankar Dasgupta, owner of the Off-Road Handbook. I am an experienced off-roader. I have been off-roading for years across several terrains in the USA. I am passionate about 4×4 driving and want to share my knowledge and experience with others.

I am excited to share my passion for off-roading with you. My goal is to provide you with the most comprehensive and unbiased information about off-roading.

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Going bigger? See what new tires really do

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Regear calculatorWhich gear ratio brings back the power after bigger tires, with highway RPM. Air-down PSI calculatorStarting trail pressure for sand, mud, snow and rocks. Backspacing calculatorWill your wheels and 35s rub? Offset ↔ backspacing. Winch size calculatorPull needed by weight, slope and terrain, layer by layer. All 8 free off-road calculators →Approach angle, water fording, Bronco crawl ratio and more.
Aerial view of a 4x4 driving a dirt road through rocky ground
Red Jeep Wrangler Unlimited Sahara on a dirt overlook at sunset

Jeep Off-Road

Dive into the world of off-road Jeeping with expert tips, trail guides, gear reviews, and thrilling adventure stories to fuel your passion for exploration and adventure.

Group of riders on ATVs on a forest dirt trail

ATV Guide

Unlock the full potential of your ATV with comprehensive guides, maintenance tips, trail recommendations, and exciting riding destinations, ensuring an exhilarating off-road experience.

Blue Holler Off-Road Park trail

Off-Road Trails

Explore the great outdoors with detailed trail reviews, scenic route suggestions, safety advice, and insider insights to help you plan unforgettable off-road adventures and discover hidden gems.

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