Bosch SmartphoneHub Middle Bar Kit 25.4mm 31.8mm 35.0mm. The SmartphoneHub transforms your bike into a fully networked eBike. The smartphone and COBI.Bike app turn the SmartphoneHub into an intelligent control center that can be used for navigation recording activities and connection to other. The eBike can also be ridden without a smartphone due to the integrated display in the SmartphoneHub showing the most important riding data.