head tube
part of a bicycle frame inside which, inside which the fork steerer tube can rotate via a headset, thereby connecting the frame to the fork holding the front wheel
en-GB/ˈhɛd ˈtjuːb/
en-US/ˈhɛd ˈtjub/
part of a bicycle frame inside which, inside which the fork steerer tube can rotate via a headset, thereby connecting the frame to the fork holding the front wheel