How to Determine the Cable Length for Your Garage Door

Use the grid below to determine your correct replacement cable length for your garage door cables (for doors using torsion springs only). 

You will need to determine some of the following information before you begin!

1.   Identify the manufacturer and part number of your cable drum

2.   Calculate the distance from the floor to the center line of the garage door spring torsion shaft.

3.   Calculate the amount of high lift your garage door has (if applicable) by using one of the following methods:

     (a) To determine amount of high lift you can measure from floor to center line of shaft in inches and then subtract the door height in inches and subtract an additional 6 ½” for a 2” track or subtract 7 ½” for a 3” track. The total remainder will equal your high lift amount; or

     (b) Measure from the floor to the bottom of your horizontal garage door track in inches then subtract your door height and the total remainder is the high lift amount.

CABLE LENGTH FORMULAS / DRUM COMPARISON CHART

The above information is only a basic reference point.  Always use precautions when replacing garage door cables.  It is recommended that these repairs only be done by trained professionals.