Where Does The “336” Come From In The Speed/RPM/Gear-Ratio/ Tire-Size Formula? Features. Events. How-To ... I'd recommend putting the formulas into a spreadsheet or a programmable calculator.

Read more about gear and final drive ratios and how to calculate these ... So do all the same calculations with data from a stock 1.8-liter Miata with a five-speed and put it on the same chart.

Then multiply both of these individual products together, and divide by the overall gear ratio times the number of inches in a mile (63,360). "336" is simply the reduced, rounded-off whole-number ...