Your crankset and cassette together define the full range of gears available to you. A compact 50/34 paired with an 11-32 cassette covers everything from fast descents to steep climbs for the vast majority of riders. The shift toward compact cranks is one of cycling's quiet revolutions — even strong amateur riders have abandoned the 53/39 standard setup because they simply never use that top gear. Crank length also matters and is often overlooked: most bikes ship with 172.5mm cranks, but riders with shorter legs or tight hip flexors often benefit from 165-170mm. Shorter cranks reduce hip impingement at the top of the pedal stroke and allow a lower, more aerodynamic position.