Aceoffix C5 trifold review

Aceoffix makes the C5 aluminum frame trifold bicycle. It has a carbon fiber fork and some important differences from the older aluminum S5 that has smaller diameter tubes. I ordered a customized version of the C5 in silver directly from the Aceofffix factory store in Chengdu, Sichuan, China. As documented here, it weighs 7.1kg with some selected but not exotic parts, e.g. a ZRace carbon crankset, a titanium rear triangle, carbon fiber seatpost. It can easily be made a bit lighter, e.g. it has ordinary (Presta valve) butyl inner tubes and Schwalbe One tires. I rode it 520km in 10 days in Chengdu. After that, I made my review and description of the build.