The most lightweight Bosch based e-bikes (such as Cannondale Topstone Neo Carbon) are far heavier than Vado SL because they carry the full power Bosch CX motor and... guess what? A heavy 500 Wh battery. Such Bosch based e-bikes can neither use any bigger battery nor an extra battery just because of the weight consideration. Besides, road e-bikes have no rear rack in the first place. To make it simple: Bosch has been unable to create any lightweight motor. Or, a lightweight battery.
E-bikes than can compete with Specialized SL by light weight are equipped with:
- Either Mahle Ebikemotion X35 rear-drive hub motor, and a 252 Wh battery;
- Or Fazua Evation mid-drive motor with a 250 Wh battery.
Neither of these systems offers any range extender.
If you are able to mention
any Bosch based e-bike that matches Specialized SL bikes by weight, please name the name and model. Also please show that such
super lightweight e-bike can use an extra battery.