43 Fork Spring (4.0–5.8 N/mm) SurRon

Fine-tune your front suspension with the Sirris F43 Fork Spring (Single), designed for use with Sirris F43 forks on SurRon Light Bee and Ultra Bee electric dirt bikes.

Available in a range of spring rates from 4.0 N/mm to 5.8 N/mm, these high-quality springs provide tailored compression and rebound to match your rider weight, terrain, and riding style. Whether tackling smooth trails or aggressive off-road sections, choosing the right spring rate improves handling, shock absorption, and overall ride comfort.

Each spring is made from durable steel to ensure long-lasting, consistent suspension performance. Sold individually, ideal for replacing worn springs or customizing your fork setup.

Available Spring Rate Options (N/mm):

• 4.0 N/mm – Softest option, suited for lighter riders or smooth terrain

• 4.4 N/mm – Light to medium riders seeking balanced suspension

• 4.8 N/mm – All-around option for varied conditions

• 5.0 N/mm – Slightly firmer for aggressive riding

• 5.4 N/mm – For heavier riders or rough terrain

• 5.8 N/mm – Firmest option for maximum support and control

 Tip: Select the spring rate that matches your weight and riding style to optimize fork performance and comfort.