Gear Design Equations Calculator
Automobile Car Truck Formulas
Problem:
Solve for Metric Tire Diameter Size to Inches
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Solution:
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 | speed |
 | rotation velocity |
 | gear ratio |
 | tire size - radius |
 | effective gear ratio |
 | tire size - diameter |
 | 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:
"Novak Conversions - Gearing & Gearing Math for Jeeps." novak-adapt.com. 2004. Ed. Novak. 21 February. 2004 https://www.novak-adapt.com/knowledge/gearing.htm.
"Edelbrock: Technical Discussion." edelbrock.com. 2005. Ed. Edelbrock. 21 February. 2004 https://www.edelbrock.com/automotive/math.html.
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By Jimmy Raymond
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