Cyclists might dominate any local gym's stationary bike section, but you'll hardly find them anywhere near the weights.
Power-to-weight ratios dominate the training principles in cycling. Aerobic endurance and V?O2 max numbers matter. Not whether you can bench-press your body weight.
Mountain bikers would rather be out spending more time on the trails, than hanging from a pull-up bar. Or doing concentric movements with some dumbbells. But are they missing out?
