Tag: Bushings

Math6 Comments

Skateboard physics: wheel lift

Ⓐ

In this post, I argue it’s essentially the difference in stiffness between the rear and front truck that causes wheel-lift. A shorter axle makes wheel lift more probable by placing the possible axis of rotation (of the wheel-lift) closer to the middle of the board (and therefore the rider’s weight further out from that axis). However, balanced front-rear truck stiffness would make wheel lift impossible, by placing that axis entirely out of reach for the rider’s weight. Continue reading Skateboard physics: wheel lift

Math4 Comments

Skateboard physics: squeezing bushings

Ⓐ

Occasionally, people assert that TKP trucks (i.e., trucks with significant forward rake) turn “progressively,” while RKP trucks (i.e., trucks with minimal rake) turn more “linearly”. That, at first glance, can only mean that the trucks resist turning in such ways. In this post, I check for patterns in the way trucks resist when a rider leans on a skateboard. Continue reading Skateboard physics: squeezing bushings

Data, Political economy4 Comments

Polyurethane (PU) products and the industry

Ⓐ

I’m skeptical about whether companies are indeed creating their own compounds. Their own molds and shapes, pigmentation and logos, sure. But don’t they still have to buy it in liquid form from somewhere?
So, I started a thread on a forum and I got into a rather interesting conversation with user Zip, which I reproduce here. Continue reading Polyurethane (PU) products and the industry