Torsion Springs

Measure the length of the unwound spring.
Do not measure the end caps of the springs. If your garage door has
left and right wound springs, measure both, as they may differ.

Next, Measure the Inside Diameter (ID) of the spring. 

Next, Determine the Wire Size.
Measure the length of 10 coils of the spring.
Example: 10 coils measures 2 1/4" = .225 wire size. (See chart below for examples)

If you currently have 2 springs on your garage door, you should replace both springs at the same time.

About City:

Balch Springs is a city in Dallas County, Texas, United States. It is both a suburb of Dallas and is part of the Dallas-Fort Worth Metroplex. The population was 19,375 at the 2000 census. A July 1, 2008 U.S. Census Bureau estimate placed the population at 20,003

The area was first settled in the 1840s. Around 1879 John M. Balch and his family settled south of Mesquite in unincorporated Dallas County. Mr. Balch found several springs on his land, one of which ran all year-round. Local residents began referring to the springs on Mr. Balch's property as Balch Springs, and use of the name continued even after he moved away a few years after his arrival. Around 1885, a county school was named after the springs. A small church and a cemetery were near the school.[citation needed] During the early 1900s, the community was widely dispersed and consisted mostly of farms. Electricity, provided by Texas Power and Light, was introduced in 1939. Gas and telephone service arrived shortly after World War II. The community began to grow rapidly along with the city of Dallas and other Dallas County towns. To avoid annexation by Dallas, Balch Springs incorporated as a city on June 13, 1953. The new city encompassed the communities of Balch Springs, Zipp City, Five Points, Jonesville, and Triangle as well as portions of Rylie and Kleberg.[6] A mayor-council form of government was adopted after incorporation. By 1956, Balch Springs had a population of around 3,500. The city was home to 6,821 residents at the 1960 census. In September 1964, a post office opened in the city and in 1965, the first taxes were levied. A 1966 attempt to disincorporate the community was unsuccessful. By 1970, the population had risen to 10,464 as the construction of new roads made commuting to surrounding cities easier. In 1988, residents voted to become part of the neighboring city of Mesquite, but the election was declared invalid. Two years later, the 1990 census reported a total of 17,406 people living in the city. The 2000 population was 19,375.