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Todays date is 6/25/2017

Gearing Calculator


Ever wonder how far off your speedometer is with your new bigger tires? This info will only approximate your corrected speed and depends on the accuracy of tire size diameters (assumimg nothing but tire size has changed).

 Speedo converter
Original Tire Diameter:   
New Tire Diameter:   
Speedometer Reading (MPH):  Corrected Speed (MPH): 
Input you Original and New Tire Diameter and Speedometer Reading please


This calculator will get you the effective ratio from the new tire size. Enter the values on the left and press Calculate.

 Find new Effective Gear Ratio with new tire size
New Tire Diameter:   
Original Tire Diameter:   
Current Gear Ratio:  New Effective Gear Ratio: 
0.00


This calculator will get you back to a ratio that's closer to your original RPM range. Enter the values on the left and press Calculate.

 Find new Equivalent Gear Ratio with new tire size
New Tire Diameter:   
Original Tire Diameter:   
Current Gear Ratio:  New Equivalent Gear Ratio: 
0.00


This formula is a nice way to get the tire diameter of those metric tires that are common on just about everything stock. For example a 265/75R16 would be around 31.6 inches tall. Enter the numbers into this form in the order you read them from the tire and press Compute.

  Convert P-Metric tire to Tire Diameter inches 
Example: 195/75R15  
/ R
Tire Diameter: 
0.00




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