What is spring preload motorcycle?

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.

What does preload do on a motorcycle?

Preload is used to adjust the shock or spring to the correct range of operation within the suspension’s travel-more preload will raise the bike up on its suspension, keeping you near the top of its travel. With less preload, the bike sits lower and closer to the bottom of its suspension travel.

What does spring preload do?

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.

How does spring preload affect handling?

Preloading is not the same as using a stiffer (higher spring rate) spring. Preloading does not change spring rate but preload does change the force to start moving the shock and high preload dramatically reduces shock performance over smaller bumps and makes for a more harsh ride and worse traction.

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How do you set preload on a motorcycle?

To adjust the preload, wind the spring collar down to reduce the amount of sag and up to increase sag.

What does preload mean?

transitive verb. : to load in advance and especially at a time removed from that of use preloaded software.

Does changing preload change ride height?

The suspension may feel stiffer when preload is increased, but that’s because adding preload compresses the spring, so it takes more pressure to move the suspension any further. Adjusting preload simply determines the motorcycle’s ride height. … Basically, when ride height is overly high there is too little sag.

How much spring preload is too much?

A good indication that you’re relying on preload too much is if the bike has no sag at all under its own weight (with you NOT on the bike). Ideally, the bike will sag a small amount without you on it (5% or so) and then reach the desired 25-30% sag with you on the bike in normal riding position.

Why preload is required?

The purpose of preload in a bearing system is to eliminate clearance that is designed into standard ball bearings. Almost all radial ball bearings are made with a clearance or space between their components to allow for free movement.

Does preload increase stiffness?

preload will change the behavour of your suspension the way a stiffer spring would.

How does spring rate affect handling?

You might think the higher spring rate would react faster, but in reality, the lower spring rate will contact the ground first, and thus allows for more grip. … With a lower spring rate, the force pressing the tire down remains higher longer relative to the amount of travel it has, so it contacts the ground much sooner.

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Does spring rate affect ride height?

You should increase the spring rate from the standard rate. … (If you increase the spring rate, the ride height will also increase, so please lower the lower seat.) When driving at the circuit, it is ok to lower the car until the tires nearly touch, but if you drive to the circuit, please abide by your local regulations.

What causes uneven ride height?


If the nose is low, negative caster is added to the front wheels. … Changes in front or rear ride height can alter front camber alignment (and rear camber on vehicles with independent rear suspensions) especially when there’s a difference in ride height side-to-side.

What is preload and damping?

Compression damping is the rate which the suspension compresses, rebound compression is the rate at which is springs back to it’s original position. Preload basically means you pre compress the suspension to stiffen it or basically reduce the maximum suspension travel allowed.