Enhance your winter cycling setup with the reliable and high-performing 45NRTH Large Concave Carbide Aluminum Studs - 25 Pack. These studs are made using a two-piece construction method and feature a concave carbide-aluminum design for improved traction and grip on icy surfaces. The large concave crown creates an open space and edges that provide twice the surface area for enhanced performance. With a concave tip for traction, durability, and longevity, as well as an aluminum base to save weight, these studs are a reliable choice for your winter cycling needs. Compatible with the 45NRTH stud insertion tool, the Large Concave Carbide Aluminum Studs offer more bite than regular concave studs and less rolling resistance than XL studs. Sold in a pack of 25, these studs are designed for extreme winter cycling applications and are not recommended for use with power assist bikes due to the additional torque and system weight that can lead to premature casing wear and stud loss.