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  Speedo converter 
Original Tire Diameter:   
New Tire Diameter:   
Speedometer Reading (MPH):  Corrected Speed (MPH): 
  Find new Gear Ratio with new tire size 
New Tire Diameter:   
Old Tire Diameter:   
Current Gear Ratio:  New Gear Ratio: 
  Find Overall Crawl Ratio 
Transmission Ratio:  TransCase Ratio:  Axle Ratio:  Overall Ratio: 
  Find MPH 
RPM:   Tire Diameter:   
Axle Ratio:  Transmis Ratio:  TransCas Ratio: 
  Find RPM 
MPH:  Axle Ratio:  Transmis Ratio:  TransCas Ratio:   
Tire Diameter:  
  Convert P-Metric tire to Tire Diameter inches 
Example: 195/75R15 
/   R 
Tire Diameter: