The first sensory response most people probably have to this righteous Garrett Grove photo from Retallack Lodge, British Columbia, is one of speed. I mean, for sure: ripping. But for me it’s sound. I love to listen to the sounds of a mountain bike flying past on the trail, the infinitely unique auditory interaction between rubber and dirt or, as the case may be, pine needles and wood chips. Every bike sounds different, every rider pilots with their own style, and even the difference of just a few PSI can make a big difference in the pitch of a tire on dirt. It’s fun to imagine, and guess.