Fully carbon fiber: Were talking frame, fork, stem, seatpost, and handlebar
If you upgrade the voltage then I guess you will also need to install a smaller sprocket in the back - probably a 10 tooth, since the current 14 tooth gives you about 33/14 = 2.4 gear which requires you to pedal very fast if you reach 15 MPH, so going to a 40/10 = 4 gear will allow you to keep up until you reach about 25 MPH
A2: It is mainly suitable for ordinary bikes and mountain bikes
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An ideal European travel backpack is lightweight, durable, and has features like anti-theft locks, water resistance, and carry-on compatibility