Gear Design Equations and Formulas Calculator

Automobile Car Truck

Solving For Speed

tire radius
rotation speed
gear ratio


tire radius
= 0
= 0
rotation speed
= 0
= 0
gear ratio
= 0
= 0



Other Units:

Change Equation
Select an equation to solve for a different unknown
speed speed
rotation velocity rotation velocity
gear ratio gear ratio
tire size - radius tire size - radius
effective gear ratio effective gear ratio
tire size - diameter tire size - diameter
crawl ratio crawl ratio

speed=MPH - miles per hour
tire radius, tire diameter, rim diameter =inches
gear ratio=if ring and pinion ratio is 4.10:1 use 4.10
rotation velocity=RPM - revolutions per minute
effective gear ratio=determine new gear ratio after a tire size change
crawl ratio=

four wheel drive rear axle differential, transfer
case low range and transmission ratios

section width=millimeters
aspect ratio=unitless

References - Books: See 3 and 4 on reference page

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