Is Strength & Conditioning necessary for cyclists? ...
Cycling happens one leg at a time. It requires repeated force production, mimicking this action off the bike with weights will make you stronger.
Cycling requires a strong core for handling your bike, climbing and overall endurance. The main goal with strength training is to create a stronger support system for your prime movers while on the bike! So YES STRENGTH & CONDITIONING IS NECESSARY FOR CYCLISTS!
Cycling is largely a cardio sport, but to go fast and to go long you must have strength, especially in leg, core, and glute muscles. Strength training builds muscle.
Strength & Conditioning keeps muscle imbalances and injury at bay. Stronger, more flexible muscles and connective tissues (tendons) are less likely to be injured from over-use, impacts (crashes), and the strains of daily life. If you have weaker muscles you are more likely to incur injuries.