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Fox Standard Steel Springs come in a wide variety of spring rates and travel specs.
Use our Fox Spring Rear Shock Fitment Guide to find the correct size spring for your Fox DHX, Fox DHX2 or Marzocchi Bomber CR shock.Use our Spring Calculator to find a starting spring rate for you, your bike, and your shock!Not sure if you want this spring or the Fox SLS Spring? Read our Fox SLS vs Fox Steel Spring article to compare both options.
Fox springs have two measurements, and for this example we will use 2.8" x 500 lbs.
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!
165mm (T)
40-55mm
3.947" / 100.2mm
4.485" / 113.9mm
185mm (T)
47.5-55mm
4.341" / 110.3mm
5.273" / 133.9mm
190mm
205mm (T)
57.5-65mm
4.735" / 120.3mm
6.061" / 153.9mm
210mm
225mm (T)
67.5-75mm
5.128" / 130.3mm
6.848" / 173.9mm
230mm
250mm
7.5 in
2 in
4.32" / 109.7mm
4.83" / 122.7mm
7.875 in
5.21" / 132.3mm
8.5 in
2.5 in
4.82" / 122.4mm
5.83" / 148.1mm
9.5 in
3 in
5.32" / 135.1mm
6.84" / 173.7mm
10.5 in
3.5 in
5.82" / 147.8mm
7.83" / 198.9mm
4.48" / 113.8mm
5.30" / 134.6mm
4.49" / 114.0mm
5.60" / 142.2mm
4.88" / 123.9mm
6.09" / 154.7mm
6.39" / 162.3mm
5.27" / 133.8mm
6.88" / 174.7mm
5.28" / 134.1mm
7.18" / 182.4mm
4.05" / 102.9mm
5.15" / 130.8mm
5.53" / 140.5mm
4.30" / 109.2mm
4.55" / 115.6mm
6.1" / 156.2mm
8.75 in
2.75 in
4.80" / 121.9mm
6.40" /162.6mm
5.05" / 128.3
7.15 in/181.6mm
5.55" / 141.0mm
8.15" / 207.0mm
4.21" / 106.9mm
5.19" / 131.8mm
4.43" / 112.5mm
5.92" / 150.4mm
5.00" / 127.00mm
5.97" / 151.6mm
5.22" / 132.6mm
6.71" / 170.4mm
5.78" / 146.8mm
6.76" / 171.7mm
6.00" / 152.4mm
7.50" / 190.5mm
803-04-130
2.5" x 250 lb - 4.285" TLG
803-04-131
2.5" x 300 lb - 4.344" TLG
039-03-013
2.45" x 350 lb - 4.381" TLG
803-04-133
2.45" x 400 lb - 4.675" TLG
803-04-134
2.37" x 450 lb - 4.723" TLG
803-04-135
2.35" x 500 lb - 4.733" TLG
803-04-136
2.35" x 550 lb - 4.776" TLG
803-04-137
2.35" x 600 lb - 4.830" TLG
803-04-138
2.30" x 650 lb - 4.954" TLG
803-04-139
2.30" x 700 lb - 5.200" TLG
803-04-140
2.55" x 700 lb - 5.701" TLG
803-04-141
2.30" x 800 lb - 5.280" TLG
Commonly used with:- 7.875" x 2.25"- 185mm(T) x 50mm- 185mm(T) x 52.5mm- 185mm(T) x 55mm- 210mm x 50mm- 210mm x 52.5mm- 210mm x 55mm
Still double check that the spring fits if your shock size is listed here!
803-04-142
2.8" x 250 lb - 4.924" TLG
803-04-143
2.8" x 350 lb - 5.799" TLG
803-04-144
2.8" x 400 lb - 5.459" TLG
803-04-145
2.8" x 450 lb - 5.409" TLG
803-04-146
2.8" x 500 lb - 5.728" TLG
803-04-147
2.8" x 550 lb - 5.949" TLG
803-04-148
2.8" x 550 lb - 5.750" TLG
803-04-149
2.8" x 600 lb - 6.382" TLG
803-04-150
2.8" x 600 lb - 5.750" TLG
803-04-151
2.8" x 650 lb - 6.150" TLG
803-04-152
2.8" x 700 lb - 6.402" TLG
Commonly used with:- 8.5" x 2.5"- 205mm(T) x 60mm- 205mm(T) x 62.5mm- 205mm(T) x 65mm- 230mm x 57.5mm- 230mm x 60mm- 230mm x 62.5mm- 230mm x 65mm
803-04-153
3.25" x 250 lb - 6.468" TLG
803-04-154
3.24" x 300 lb - 6.126" TLG
803-04-155
3.25" x 300 lb - 6.476" TLG
803-04-156
3.25" x 350 lb - 6.689" TLG
803-04-157
3.25" x 400 lb - 6.634" TLG
803-04-158
3.25" x 450 lb - 6.760" TLG
803-04-159
3.15" x 500 lb - 6.600" TLG
803-04-160
3.25" x 500 lb - 6.909" TLG
803-04-161
3.15" x 550 lb - 6.400" TLG
803-04-162
3.25" x 550 lb - 6.929" TLG
803-04-163
3.25" x 600 lb - 7.114" TLG
803-04-164
3.19" x 650 lb - 6.815" TLG
803-04-165
3.19" x 700 lb - 7.130" TLG
Commonly used with:- 8.75" x 2.75"- 9.5" x 3.0"- 225mm(T) x 70mm- 225mm(T) x 72.5mm- 225mm(T) x 75mm- 250mm x 70mm- 250mm x 72.5mm- 250mm x 75mm
803-04-166
3.85" x 150 lb - 6.800" TLG
803-04-167
3.80" x 200 lb - 7.000" TLG
803-04-168
3.80" x 225 lb - 7.000" TLG
803-04-169
3.75" x 250 lb - 7.200" TLG
803-04-170
3.75" x 275 lb - 7.500" TLG
803-04-171
3.70" x 300 lb - 7.750" TLG
803-04-172
3.70" x 325 lb - 7.755" TLG
803-04-173
3.70" x 350 lb - 7.750" TLG
803-04-174
3.65" x 400 lb - 7.750" TLG
803-04-175
3.65" x 450 lb - 8.100" TLG
803-04-176
3.64" x 500 lb - 8.250" TLG
Commonly used with:- 10.5" x 3.5"