The spring rate (measured in ) depends on several bike-specific and rider-specific variables:
| Rider weight (lbs, geared) | Spring rate (lbs/in) | |----------------------------|----------------------| | 140–160 | 350–400 | | 160–180 | 400–450 | | 180–200 | 450–500 | | 200–220 | 500–550 | | 220–240 | 550–600 |
While digital calculators automate this process, calculating the rate manually ensures you understand how your bike's suspension interacts with your weight. The industry-standard formula for a target sag of (ideal for the DHX2) is: dhx2 spring calculator
This is the most common error riders make. "Rider Weight" does not mean your body weight in underwear. It means :
Step 3 (Division)∶737.11.671=441.11 lbs/inStep 3 (Division) colon 737.1 over 1.671 end-fraction equals 441.11 lbs/in Fox SLS and standard steel springs are sold in . In this scenario, the rider should choose a spring for a firmer, more supportive ride, or a spring if their frame's linkage is highly progressive. 3. Fox DHX2 Spring Weight Recommendation Matrix The spring rate (measured in ) depends on
160mm rear travel, shock stroke = 65mm Leverage ratio = 160 ÷ 65 ≈ 2.46 (average) Rider weight = 190 lbs (86 kg) with gear Desired sag = 30% (0.30) Shock stroke in inches = 65 ÷ 25.4 ≈ 2.56 in
Example: An 85kg rider with a 16kg bike and 4kg of gear/pack has a system weight of roughly 105kg. It means : Step 3 (Division)∶737
Fox offers standard steel springs and SLS (Super Light Steel) springs.
(190 × 2.46²) ÷ (2.56 × 0.30) = (190 × 6.05) ÷ (0.768) = 1149.5 ÷ 0.768 ≈ 1497 lbs/in → That’s huge — obviously wrong?
Never exceed (usually 2–3 turns past zero coil play). DHX2 is sensitive to coil bind.
Once you install a spring:
