Patent ID: 7712758

Claim:
A bicycle frame comprising: a top tube with a front end and a rear end, a head tube with a top end and a lower end, a down tube with a front end and a rear end, a seat tube with a top end and lower end, the front end of the top tube connected to the top end of the head tube, the front end of the down tube connected to the lower end of the head tube, the top tube and down tube diverging away from each other and extend rearwardly from the head tube, the rear end of the down tube coupled to the lower end of the seat tube, the rear end of the top tube top connected to the top end of the seat tube, the top tube, head tube, down tube and seat tube substantially forming a closed main frame loop, the frame comprises a sub assembly molded simultaneously as a single piece comprising the top tube, the head tube and the down tube with the rear end of the top tube open providing access though the top tube to the top end of the head tube and with the rear end of the down tube open providing access through the down tube to the lower end of the head tube wherein the sub assembly is molded with a removable first core extending via the open rear end of the top tube into the interior of the top tube and through the interior of the top tube into the head tube and with a removable second core extending via the open rear end of the down tube into the interior of the down tube and through the interior of the down tube into the head tube.