The evolution of the original Fly design sees the addition of 3D feet attachment resulting in improved force absorbtion and screw attachment FLY is made of two tubes making it the purist in the lightweight class Tapered, simplistic design weighs only 341g yet can hold loads up to 39lbs Mounts via the eyelets and single rear stay attachment to the brake bolt Non-adjustable design is compatible with wheel sizes 26″ and 700c/29″ Maximum tire compatibility of 45mm