K-Tech Spring Rate Calculator
Recommended K-Tech Spring Rates
Note: Values are calculated in N/mm (Newtons per millimeter), the standard unit for K-Tech performance springs.
Understanding Suspension Spring Rates
Choosing the correct K-Tech spring rate is the single most important modification you can make to your motorcycle's handling. Spring rate refers to the amount of force required to compress a spring by a specific distance. K-Tech springs are manufactured from high-tensile chrome silicone wire and are designed to provide consistent performance under extreme conditions.
Why Spring Rate Matters
If your springs are too soft for your weight, the bike will sit too low in its travel (oversag), leading to harsh bottoming out and poor steering geometry. If they are too stiff, the suspension won't move enough to absorb bumps, resulting in a loss of traction and rider fatigue. Correct spring rates ensure your suspension operates in the "sweet spot" of its stroke.
The Front vs. Rear Balance
Front fork springs typically range from 8.0 N/mm to 11.0 N/mm for sportbikes. Rear shock springs are much stiffer due to the linkage leverage ratios, often ranging from 80 N/mm to 120 N/mm. Our calculator accounts for these differences based on your specific bike category and weight.
Example Calculation
A typical 85kg rider on a 1000cc Sportbike used for track days would generally require:
- Front: 9.5 N/mm to 10.0 N/mm
- Rear: 95 N/mm to 105 N/mm
Always verify your static and rider sag measurements after installing new K-Tech springs to confirm the rates are perfect for your chassis setup.