Diameter is a few millimeters smaller so this is a 520 mm rim. Brompton front hub 8 mm axle. Older front hubs especially french.
3 969 mm 5 32 steerer fork bearings and many pedals.
6 35 mm 1 4 rear wheel hubs usually 2 times 9 balls and cup and cone bottom brackets 2 times 11. Since the 1980s bicycles have adopted standard axle spacing. Boost spacing was designed in order to make 29er wheels and frames stiffer. Brompton front hub 8 mm axle.
