RideFast JUNE 2021

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TECH FEATURE SUSPENSION What is sag? Motorcycle springs are always under tension, even when stationary. Vehicle weight causes compression at all times. Add a rider or two and luggage, and the suspension compresses even further. Sag is the percentage of suspension travel utilized while stationary. If the suspension sags too much when at rest, the bike may bottom out when encountering bumps once underway. Too little sag can cause a stiff, harsh ride. The difference between the fully extended length of the suspension and the length compressed by the weight of the motorcycle and rider is called “total sag” or “race sag”. (credit - Universal Technical Institute www.uit.edu) What is preload? Some motorcycles offer suspension preload adjustability. Preload is the amount of tension on the springs when the bike is at rest. Increasing preload will decrease sag, and vice versa. Since a single motorcycle is often used for solo riding, riding with a passenger or riding with luggage, preload adjustment allows a degree of adaptability for multiple use cases. Although not recommended, adjusting preload can increase ground clearance for off road travel or decrease seat height for shorter riders. Some novice riders use preload as a ‘band-aid’ for overcoming incorrect spring stiffness relative to their height and weight. While not ideal, this is a common practice, as changing springs is expensive and labour intensive. By turning the bottom adjuster collar, more or less preload force is applied to the spring, while not changing the overall length of the spring. Increasing preload will result in less suspension sag once under rider load. (credit - Universal Technical Institute www. uit.edu) A little quick hack from Séan I have found the quickest and most inexpensive way to adjust, mostly lowering, the ride height of a bike is to change the suspension linkages, (where possible), and to drop the forks sliders through the triple clamps. This has no effect on the preload and sag and if done correctly has very little effect on the geometry of the bike. on the I lowered my wife’s Yamaha XT660R by 20mm overall. Firstly, I stood the bike upright and taped a water level to the seat and marked where the bubble was. 24 RIDEFAST MAGAZINE JUNE 2021 W
GET OPTIMIZED! WP PRO COMPONENTS WP develops high-performance motorcycle suspension and components. With a focus on innovation and precision, WP is committed to giving riders the technical edge to take their riding to their personal pinnacle of performance. But to harness speed, one must be truly dynamic, so adjustability is of top importance. This lets WP-equipped riders maximise their potential to meet the unique demands on equipment, personal skills and fast-changing conditions in the powersports realm. WWW.WP-SUSPENSION.COM RIDEFAST MAGAZINE JUNE 2021 25
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