What Does Preloading Harley Davidson Fork Mean?

What does preload on forks do?

Preload pre- compresses your spring so that it takes more/less force to begin compressing the fork. Increasing the preload will increase the stiffness of the fork (like increasing air pressure in an air fork). Decreasing preload will decrease the stiffness of the fork, similar to decreasing air pressure in an air fork.

What is motorcycle fork preload?

Preload is simply the amount the springs are compressed while the suspension is fully extended. A typical pair of sports bike fork springs are about 8.5-9.5N/mm. Adding more preload just means the fork won’t need to compress as far for the spring to get its 50mm, so the bike will sit a little higher at the front.

Does preload affect ride quality?

Spring preload pushes the tire down and makes the suspension work. On big bumps at speed the spring preload pushes the tires down to better follow the terrain and make a smoother, more controlled ride. Under articulation the spring preload increases tire contract pressure improving traction.

What happens if you have too much preload?

Heavy preloading can add over 100 pounds (45kg) of force required to start shock movement whereas optimal shock performance comes from the lowest starting force possible. Heavy preload means those smaller bumps won’t even move your suspension.

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How do you adjust the front fork suspension on a motorcycle?

Set sag on front forks To measure this, put the bike in a chock or have a mate hold it steady. Use a cable-tie, compress the forks, let them settle and push the cable tie up to the outer dust seal. Get off, and take the weight off the front so the forks are fully extended. The sag is the distance it’s travelled.

How is motorcycle SAG calculated?

To get the actual sag figure you find the midpoint by averaging the two numbers and subtracting them from the fully extended measurement L1: static spring sag = L1 -[(L2 + L3) / 2]. Step 5: Adjust the preload with whatever method applies to your bike.

What is rebound on a motorcycle?

Rebound damping regulates the speed at which your fork or shock recovers, or bounces back, from an impact and returns to its full travel. Much like a compression circuit, rebound damping relies on oil moving through a circuit to regulate the speed at which the suspension extends after being compressed.

Does preload affect ride stiffness?

The myth: Preload affects spring rates and handling characteristics. Why it’s wrong: The short answer is that preload won’t make a spring any stiffer, and it won’t make it any softer, but all you want to know is why you’ve been told the opposite.

Is stiff suspension good for drifting?

Suspension. A good set of coilovers is a very wise investment—they’re the heart of what will make your drift car handle well. Race car stiff is out—for drifting, you want to use spring rates that are only a little stiffer than typical high-performance street coilover spring rates.

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How does a preload spacer work?

A preload spacer being put within the spring/shock assembly increases the ride height by stiffening the springs and limiting compression.

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