US Patent 7559603 Bicycle seat tube adjusting assembly

A bicycle seat tube adjusting assembly includes: a rod body which is installed with a positioning seat; a first clamping unit and a second clamping unit being assembled with the positioning seat; two channels being formed between the first clamping unit and the second clamping unit for clamping; an adjusting unit installed with the second clamping unit; the adjusting unit having at least one protrusion and at least one tightening unit abutting against the protrusion; and a positioning unit resting against the positioning seat; and wherein by the adjusting unit, the first clamping unit and second clamping unit are adjusted on the positioning seat so as to provide a preferred riding position.