True. Because of the way the Spyder suspension is designed, any amount of lean will create some amount of bump steer. But because this issue is exponential and not linear, any reduction in lean will eliminate a much greater amount of bump steer. So the effect of an upgraded sway bar will reduce the amount of bump steer to a point where the rider may no longer perceive it.
There is an easy way to test how much bump steer you are getting. When entering a curve or sweeper at a speed which creates a fair amount of lean on your Spyder, pay attention to how many times you have to adjust the angle of your handlebars to stay centered in your lane. Typically, with stock suspension, you will need to make at least 3 adjustments to the handlebar angle. This may not seem like much and many stock Spyder riders simply get used to this process. But on a road like the Dragon, or a long day in the saddle, you may begin to notice arm or shoulder fatigue.
With a suspension upgrade you should be able to enter pretty much any curve, set the steering angle on the handlebars and be done until you exit the curve. This may sound like a small thing. But believe me, it is pretty impressive and instills a great deal of confidence in the machine. Of course this is not the only benefit provided by upgrading your suspension. But it is one of the more noticeable and often used improvements.
Yes an No. In technical terms, it is not a suspenion issue at all, but rather a poorly designed steering setup. The Spyder has very short wheel travel vertically. Ideally, with any type of independent front suspension, the location of the tie rod ends are optimized to induce the least amount of bump steer.
Ron, our 14 Spyder has run your bar for many years. Without doubt an improvement. I also fitted BRP / Can Am aftermarket Fox Shocks. The Fox setup does run a firmer spring. Combined the increased chassis roll resistance from both the firmer springs and firmer swaybar, stabilize the chassis and add control.
I never had our Spyder laser aligned. When two wweks old, it became obvious to me, still with all stock swaybar and shocks, that the front wheels hadtoo much toe out. The excess toe out, combined with bump steer induced the sawing on the bars in corners, even unintended darting to the inside of the curve.
I did align the Spyder myself, using toe sticks. After a small amount of adjustment, the tow in setting was correct and the Spyder tracked well.
Adding the swaybar alone does not alter alignment. Installing the Foxes, raised the front 10mm. The 10mm change altered the toe in. The toe increased over 1/4” at the wheels.
After realigning, with the current setup, bump steer is not obvious with chassis roll. Corners are smooth with no sawing.
Simply, aligned correctly, accounting for the riders weight, and suspension setup the bikes are easy to handle and smooth.