From loose snow to icy freeze-thaw and everything in between, Wrathchild craves the best and worst winter conditions. - XL Concave Studs - Deep lugs provide accelerating, braking, and cornering traction - Open tread pattern sheds snow - We design 45NRTH tires for extreme winter cycling applications. We do not recommend this product be used with power assist bikes as the additional torque and system weight can lead to pre-mature casing wear and stud loss.