Sirris F43 spring (single)

Sirris F43 Fork Spring (Single) | By Sirris Suspension | For F43 Forks on E-Moto Platforms

Fine Tune Your Front Suspension the Right Way

At REV Rides we always tell riders that suspension performance starts with the correct spring rate. The

Sirris F43 Fork Spring

allows riders to dial in their suspension setup to match rider weight, riding style, and bike configuration. These springs are designed

specifically

for

Sirris F43 forks

and are available in multiple rates so you can properly balance your suspension for maximum performance.

Unlike many forks, the F43 platform allows riders to run different spring rates in each leg to achieve an exact combined rate. This makes it possible to create a perfectly tuned setup without compromising overall fork performance. Whether you are upgrading components, adjusting for rider weight, or fine tuning your suspension for racing or trail riding, the correct spring rate makes a huge difference in traction, stability, and control.

Why Proper Fork Spring Setup Matters

Improves front-end traction and stability

Maintains correct suspension sag

for balanced handling

Optimizes damping performance

from your F43 fork

Allows precise tuning

for rider weight and riding style

Supports heavier upgrades

such as larger batteries or performance components

Technical Specifications

Spring Length:

445 mm

Inner Diameter:

29.6 mm

Compatible Fork:

Sirris F43 forks

Sold As:

Single spring (two required per fork set)

Available Spring Rates

3.2 N/mm

3.6 N/mm

4.0 N/mm

4.4 N/mm

4.8 N/mm

5.0 N/mm

5.4 N/mm

5.8 N/mm

Spring Rate Tuning

F43 forks allow riders to run

two different spring rates

to achieve an in-between combined rate. This gives riders more flexibility when dialing in suspension performance.

Example: A common Sur-Ron Trail Medium setup averages

4.6 N/mm

. This is achieved by installing a

4.4 N/mm spring in one leg

and a

4.8 N/mm spring in the other

. The result is a balanced combined spring rate without requiring custom springs.

Setup Notes

Two springs are required per fork set

Different spring rates can be combined to achieve an in-between rate

Oil levels and clicker settings should remain the same on both fork legs

No separate tuning is required when running two different spring rates

Fitment

Sirris F43 Forks

Commonly used on Sur-Ron, Talaria, E-Ride Pro, Ventus, and other compact e-moto platforms using the F43 fork

Ideal Riders for This Upgrade

Riders dialing in suspension for

specific rider weights

Builders upgrading to

heavier batteries or performance components

Anyone fine tuning their

Sirris F43 suspension setup

for maximum performance