Here's an interesting situation that I really wasn't pleased with on my Foreman. While heading straight down hill, using mostly engine for breaking, but bumping the brakes once and a while, I noticed that the quad was becoming increasingly harder to keep in a straight line. After thinking about it for a minute, I realized that as traction (braking traction) was being transfered from left to right, the bars were being pulled from one side to the other. As the right wheel got traction, the left wheel was allowed to spin faster, hence pulling the bike to the right, and Vice-Versa. I assume that this would only be the case on a traditional true differential like the Foreman.