Enter the distance between the upper shock mount and lower shock mount (in) and the distance between the bump stop and the axle into the Shock Length Calculator. The calculator will evaluate the Shock Length. 

Shock Length Formula

The following two example problems outline the steps and information needed to calculate the Shock Length.

SHOCK = (D1 – D2) – 1

  • Where SHOCK is the Shock Length (in)
  • D1 is the distance between the upper shock mount and lower shock mount (in) 
  • D2 is the distance between the bump stop and the axle 

How to Calculate Shock Length?

The following example problems outline how to calculate Shock Length.

Example Problem #1:

  1. First, determine the distance between the upper shock mount and lower shock mount (in). 
    • The distance between the upper shock mount and lower shock mount (in) is given as: 6.
  2. Next, determine the distance between the bump stop and the axle. 
    • The distance between the bump stop and the axle is provided as: 4.
  3. Finally, calculate the Shock Length using the equation above: 

SHOCK = (D1 – D2) – 1

The values provided above are inserted into the equation below and computed.

SHOCK = (6-4) – 1 = 1 (in)


Example Problem #2: 

For this problem, the variables required are provided below:

distance between the upper shock mount and lower shock mount (in) = 3

distance between the bump stop and the axle = 1

Test your knowledge using the equation and check your answer with the calculator..

SHOCK = (D1 – D2) – 1 = ?