Patent ID: 6695089
Filing Date: 2004-02-24
Classification: B62K,F02F

Abstract:
A motorcycle comprising:an engine; a head pipe located in a forward portion of said motorcycle; a main frame running from said head pipe, above said engine and towards a rear portion of said motorcycle; and a down frame extending from said headpipe and sloping diagonally downward to a front of said engine, said down frame having a hollow interior and including a strengthening rib integrally provided on an inner surface of said hollow interior of said down frame, wherein a first side surface of said down frame is formed in a tapered shape becoming gradually thinner in a downward, direction, said first side surface of said down frame being considered to be a rear side, as taken in a normal travel direction of said motorcycle, and wherein said strengthening rib extends along an entire length of said inner surface of said down frame opposite to said first side surface.