Fox springs have two measurements, and for this example we will use 2.8" x 500 lbs.
- - “2.8"” refers to the maximum free stroke of the spring. Free stroke is the maximum amount a spring can be compressed until the coils touch and create “coil bind” which is very bad. This example spring can be compressed 2.8" before coil bind occurs.
- - “500 lbs” refers to the spring rate, which is how stiff or soft the spring is.
- - Springs also have a "TLG" length which just means Total Length. This is physically how long the spring is when uncompressed.
The following must apply for proper spring fitment:
- Each shock has a minimum and maximum TLG that fits, which is shown in the first set of charts below.
- The goal is to find a spring with your desired spring rate and with a TLG that falls within the range of TLG for your shock’s model and size.
- The maximum free stroke of the spring MUST be larger than the stroke length of your shock. If it is not, coil bind will occur and parts will explode.