The HPC Scout Pro electric bicycle, which can hit 45 mph (72 km/h), doesn’t fit neatly into any of the standard electric bicycle classes.

Class 1 and 2 e-bikes can reach speeds of 20 mph (32 km/h) while Class 3 e-bikes reach 28 mph (45 km/h). I used to think Class 3 e-bikes were fast. Now I think the system needs more classes.