Cycling performance is often gauged by VO2 max and Maximal Aerobic Power (MAP), but when it comes to uphill cycling, watts per kilogram of body weight (WKG) stands out as the best predictor.

So a high gear is good because you can go fast but it's hard. So a low gear makes it easier to cycle, especially uphill. STEVE:What is a gear anyway? It's just a circle with some teeth around the ...