Mavic Aksium Race Wheelset Weighing in at 1735 Grams the Mavic Askium sets the standard for being a low weight Bullet-Proof Wheelset Front Wheel - 800 grams, Rear Wheel - 935 grams Dual-sealed high-quality bearings with C3 tight tolerances for dirt-resistance and high efficiency will make these wheels last a lifetime of hard riding in all conditions Mavic's Self-Lock spoke end system makes it impossible for spokes to loosen so the wheel needs to be trued less than wheels with conventional spokes Milled brake surfaces improve brake friction and eliminate shuddering making the Askiums great for stopping on a dime in all weather conditions Compatible with Shimano and SRAM 9/10/11 speed cassettes