one could argue that point, but yes more stock parts than most.

in general seatpost is much longer and usually thicker, i carry like 9 or so different ones, and others have them too. handleposts are usually make specific but in many cases there are several options as well, like for dahon a short jettream post ..

tires and wheels are small but besides the front hubs on most bikes ( 74 mm) versus 100 mm are also available in all kinds of tastes and money, from a walmart bmx tire to a schwalbe xx ultrmo ( which costs more than some car tires $)

drivetrain shifter saddle handlebar etcetc are mostly standard parts
chainrings are usually bigger than road bikes due to smaller wheels

but again most stuff is pretty normal
best thor