Work

Effects of crank length on cycling efficiency, sprint performance, and perceived fatigue in high-level amateur road cyclists

Year: 2025

Type: article

Abstract: This study aimed to evaluate the effects of three different crank lengths (165 mm, 170 mm, and 175 mm) on cycling efficiency, sprint performance, and perceived fatigue in high-level amateur road cyclists. A single-blind, randomized crossover design was employed, involving 28 trained male cyclists who completed three trials, each using a different crank length. Performance metrics, cycling economy (CE) including 20-min cycling under 60 % VO 2MAX , peak and average power during a 6s sprint, cadence, heart rate, and perceived exertion, were measured using validated ergometers and metabolic analyzers. The results indicated significant differences in 60 %VO 2MAX RPE were observed between the 165 mm and 175 mm cranks ( p < 0.001, δ = −0.72) and between the 175 mm and 170 mm cranks ( p < 0.001, δ = −0.67). In contrast, no significant difference was observed between the 165 mm and 170 mm cranks ( p = 0.25, δ = −0.17). For 60 %VO 2MAX , 6sMaxPower, 6sAVPower, 6sAVRpm, CE, 60 %VO 2MAX AVHeart, 6sMaxRpm no significant differences were observed between any of the crank length groups ( p > 0.34). For high-level amateur road cyclists, using a 165 mm or 170 mm crank reduces subjective fatigue compared to a 175 mm crank, influencing affecting cycling efficiency or sprint performance. These findings help refine crank length recommendations to optimize performance, reduce injury risk, and improve comfort for high-level amateur road cyclists.

Source: Journal of Exercise Science & Fitness

DOI: 10.1016/j.jesf.2025.100384