Honestly, if you already have a bicycle that you like and are willing to convert, then you probably don't need to look any further than a Bionx kit. If you don't, then you should still consider buying a bike just to throw on one of these kits. They're that good. This Canadian company has been developing their totally propriety tech for over ten years. Their "proportional" torque sensor may be the only one in the industry that can actually sneak power into your pedaling without you realizing it.