You can measure this while it s still attached.
How to measure for garage door springs.
Inside diameter 90 of doors have a 2 0 inside diameter 3.
You also need to know the size of the wire itself.
In order to order new garage door torsion springs you will need to measure as accurately as possible your current spring s and find the.
Measure the circumference of the cable drum and measure the height of the garage door in inches.
How to measure for inside diameter it is very likely that like 90 of americans you have a 2 00 inside diameter.
There is another way to determine the number of turns on the springs on larger standard lift industrial doors or residential doors with non standard drums.
Note the measurement of the one piece.
When you measure a garage door spring it s not enough to simply take a tape measure and record the length from one end to the other.
Spring orientation only worry about this if you have a 1 s.
Measure the springs at one of the hinges from the steel hook that attaches to the chain at the lower end to the top of the coil spring loop at the upper end.
Divide the height of the garage door by the cable drum circumference then add one.
Spring length how long each spring is 4.