Deep-section wheels are bicycle wheels designed with a deeper rim profile, which enhances aerodynamics and reduces drag. This design allows cyclists to maintain higher speeds with less effort, making them popular among competitive riders and triathletes. The increased depth also provides improved stability in crosswinds compared to traditional shallow rims. These wheels are typically made from lightweight materials like carbon fiber or aluminum, contributing to overall performance. However, deep-section wheels can be heavier and may not be ideal for climbing steep hills. Riders often choose them for flat or rolling terrain, where their aerodynamic benefits are most pronounced.