Wilbers en comparativa
Source of the report: PS magazine, isssue 8, August 2006, section taken from TUNE-UP
Stroke of a feather
Who likes to ride a good clear line needs a great suspension system. Standard suspension elements work acceptable but especially the rear suspension often offers occasions for criticism: If you ride forcefully and/or prefer to ride with a lot of load you sometimes, when crossing big road bumps, can feel noticeable unrest in the stern which might enhance to an annoying stamping. This originates from really soft shock absorbers that even might compress to the block. In those cases the damper cannot absorb small unevenness so that the wheel transfers the uneasiness to the rear end which consequently starts to stamp. The cardan joint reactions of the GS even support this unwanted effect. There are however suspension elements on the market which can soothe the rubber cow. Who does not want to purchase new shock absorbers for his bike, might modify the standard models.
For this report, PS tested a total of eight suspension systems. For that, our testers raced the Nordschleife (north-slope of the famous German Nrburgring) and later on continued on a really awfully furrowed road nearby. To come to the point: Each one of the tested shock absorbers functioned better that the standard-part. Without exception those damping systems dispose of hydraulic preload adjustment by a manual crank. Apart form the standard shock absorber those features cost extra charge, but that is a rewarding expenditure, because the rider therewith can change the preload easily at any time to match different states of burden of the bike. Another useful feature is unfortunately only provided by the standard shock and damper of Hyperpro, namely splash-guard. All other candidates work in front of an unprotected back wheel so that dirt and mud might damage the precious suspension systems.
Hyperpro - Öhlins - Wilbers - WP -
One accessory you can clearly do without is the height adjustment of the shocks lug. Changing the level of the BMW is unnecessary because the big-enduro (Groenduro) offers enough ground clearance and is well balanced. But since some manufacturers offer height regulation serially in those cases the shock absorbers should be adjusted exactly to standard length. If they are longer the swing will be uncomfortably steep or the front is jutting out too much what might cause, in extreme cases, damage to the rear wheel drive. To lower the GS for shorter riders, most fabricators offer lowering kits- together with the shortened shocks the seating height can therewith be decreased for as much as 20 to 80 Millimetres. PS offers setup-tips in every text box. If it says static negative-suspension-travel we are talking about the distance between a completely rebounded shock and the shock absorber when it is burdened with the motorcycles own weight only. For the rear wheel you can determine this measure by marking a spot on the rear wheel drive casing and another one directly on the frame-stern. At first, measure the distance when the shock is completely rebounded (put the bike up on the main stand). After that you set the GS back on its wheels and measure the distance again, using the same marks as before. The difference is the static negative-suspension-travel. For the front part, this procedure is unnecessary because all accessories are optimally preloaded ex-factory. To tune the damping after PS-defaults you have to close all adjustment screws completely before opening them to the recommended value. We also wrote in the information boxes whether or not a vehicle has to be presented to an assessing organization (Dekra, GT, TV) for acceptance after mounting the suspension parts. Normally the tester of the assessing organisation only rechecks the professional installation. An entry in the vehicles document or paper is not necessary; it is enough to show him the respective document.