1. Weight, while it is lighter per unit than CFRP, you need more of it to sustain the same rigidity making it heavier. You actually need very little CFRP for a

1. Weight, while it is lighter per unit than CFRP, you need more of it to sustain the same rigidity making it heavier. You actually need very little CFRP for a bike and mostly solid or near-solid wooden panels. Quite some of the minimum weight of professional bikes is additional equipment and the gearing mechanism. (min weight is a bit less than 7kg) 2. Stiffness. While not good for every day usage, it is good if you want to go fast. All energy absorbed is wasted as heat or vibrations (e.g. sound).