So, while the Victory as tested had the best ride, we had to discount that result to a certain extent because of the non-stock seat. The Street Glide was the second-most comfy, despite having just 2 inches of rear-wheel travel. And though the Star had ride qualities almost rivaling those of the Victory, it ranked third in comfort for causing its riders to squirm around on the seat sooner than on the others. The Victory’s wind protection was equal to that of the H-D, though the buffeting at higher speeds was considerable on all three, especially the Yamaha. The short windscreens on these bikes may be stylish, but all three would benefit greatly from taller shields.
The two most commonly used polyamide grades by far are PA6 and PA66. The remaining members of the polyamide family are primarily used in applications that require unusually high service temperatures or tolerance of moist conditions. Bio-based and transparent (amorphous) PA grades are also available. In machine design purposes PA is often reinforced with glass or - in case of highly demanding applications - with carbon-fiber. Reinforcement changes the characteristics of the material and its applications considerably and therefore I’ll write a separate article on them later. This article focuses on unfilled PA6 and PA66.