Technical Calculators

Gear Ratio

Specify 5 out of 6 values

Tire Diameter		Transmission Ratio	: 1	Crawl Ratio
Diff Ratio	: 1	Transfer Case Ratio	: 1
RPM		MPH

Tire Size Change

Specify all values with a *

New Tire Diameter *		Effective Ratio		Hi Gears
Old Tire Diameter *				New Gears
Current Gear Ratio *	: 1			Lo Gears

Metric Tire to Inches

Specify 3 out of 4 values

Tire Size (e.g., LT235/75R16 = 30") LT / R =
Section Width	inches	Section Height	inches

Ring and Pinion Ratio Using Tooth Count

Specify 2 out of 3 values

# Ring Gear		# Pinion Gear		Gear Ratio

Speedometer Check

Specify 3 out of 4 values

Original Tire Diameter		Speedometer MPH
New Tire Diameter		Actual MPH