Fox Steel Coil Spring

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 stroke length 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.

STEP 1
- Find your shock’s model and size in the first group of charts.
- Write down the shortest and longest TLG lengths shown in the chart.

STEP 2
- Scroll down to the model of Fox spring you want.
- Refer to the right side “Commonly Used With” to quickly locate which length most likely applies. Still double check that this size fits your shock!

STEP 3
- Look for the spring rate you want in the chart. Some sizes have the same spring rate twice, so note that.
- Look at that spring’s TLG to see if it fits within the range of your shock that you wrote down.
- If your desired spring rate is listed twice, check each TLG to see which will fit.

STEP 4
- Make sure the spring’s stroke length is larger than your shock’s stroke length.
- For example: If you have a 65mm stroke, convert that to inches which is 2.6”. If a 2.8” spring’s TLG fits, then you are set since 2.8” is larger than 2.6”.
- If you find a TLG that fits, but the shock’s stroke is longer than the spring’s stroke, you may not be able to use a coil shock or need to find a different spring.

STEP 5
- If multiple springs show to fit, choose which one you'd like to use.
- A slightly shorter spring will sit farther down on the preload threads, while the longer option will sit higher on the threads.
- There is no performance advantage either way, and this is just personal preference. A shorter spring will be slightly lighter, but that is all.

STEP 6
- Order the spring that meets all criteria and ride!