Calculators

Rancho Speed Calculator

To create your individual speed chart, select your tire size and click "calculate".

 

Width

 

Series

 

Wheel Size

 

Please enter the tire size of the rear axle: 

 / R  


Please select the ratios: 

  

Differential ratio

4th gear ratio
  a 4.12 0.89
  b 4.12 0.82
  c 3.88 0.89
  d 3.88 0.82
  e 3.44 0.93
  Indicate your ratios 
 

Thanks to Custom Speed Parts for their help with the Speed Calculator.

Rancho HP Calculator

Input:

Total Car Weight (with driver):
E/T (quarter mile elapsed time):
Trap Speed (MPH at end of quarter mile):


Output:

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Due to evolving pricing and availability of materials and parts, please call for any info and service timelines and to order: (714) 680-6737