“Some mountain bike owners with fourth-generation Bosch electric motors describe how they had four or five – yes five – replacement motors fitted during the two-year warranty period.”
Bosch doesn’t sell the parts, so every failure means a whole new unit and the old one goes to landfill. Out of warranty, manufacturers want up to £700 for a replacement motor. An independent shop overhauls them for £250 to £370 and gets about 250 motors a month. Some owners say Bosch told them not to ride in wet conditions. They bought mountain bikes in Wales.