Abstract: A bicycle stern has a steering tube clamp with a bore for receiving a steer tube and a pair of parallel spaced arms each having an elongate slot at a distal end. An extension has a proximal end, receivable between the clamp arms, and a bore extending transversely through its proximal end. A pin, extends through the elongate slot in each arm and through the bore in the extension for securing the extension to the steering rube clamp. The pin slots and bore are in non-rotational engagement to prevent rotation of the extension relative to the clamp, and the pin is selectively movable longitudinally within the slots for adjusting reach of the extension.

Abstract: A bicycle seat height and alignment device has a first collar for affixing on the top of a bicycle seat tube of a bicycle frame and a second collar for affixing on a bicycle seat post to which a bicycle seat is affixed. The collars each have a complementary circumferentially extending abutting face. The faces are abuttable in only one possible orientation so as to align a bicycle seat affixed to the seat post with the bicycle frame when the seat post is located on the seat tube such that the collars are contiguous.