Calculate the total gear reduction of an off-road vehicle.
Input Parameters
Calculation Results
Enter gear ratios to calculate
About this calculator
Quick Reference
Trans 1stFirst gear ratio of transmission
T-Case LowLow range ratio of transfer case
Diff RatioAxle gear ratio (e.g. 4.10)
100:1Engine turns 100 times for 1 wheel turn
Overview
Crawl ratio is the total gear reduction of a vehicle in its lowest gear set. It represents how many times the engine turns for every one turn of the wheels. A higher crawl ratio provides more torque and slower speeds for technical off-roading.
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Pro Tips
Common 1st gear ratios: 3.0 to 6.0.
Common transfer case low ratios: 2.0 to 4.0.
Common differential ratios: 3.5 to 5.5.
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Fun Facts
"A 'good' crawl ratio for rocks is often considered 50:1 or higher."
"Extreme 'rock crawlers' can have crawl ratios well over 100:1."
"The higher the ratio, the more torque is applied to the wheels, which can also increase the risk of breaking axles if not careful."
Formula: Crawl Ratio = Trans 1st * T-Case Low * Diff Ratio
