Lennard Zinn

Your tires actually play a surprising role in how fast you ride, and what you think you know about rolling resistance is probably wrong.

Determining helmet safety requires testing, so we tested six helmets beyond the certification tests required to sell bicycle helmets.

What does an athlete ask of their heart that a non-athlete doesn't?

Polarized, UV protection, lens distortion—what do all these terms mean when it comes to buying sunglasses? And do they even matter?