Saddle-riding vehicle comprising an engine assembly and a frame to which is connected said engine assembly , wherein said frame comprises: - a steering tube to which a steering assembly that controls a front wheel is pivotally connected; - a central part to which is hinged a first end of a fork which also comprises a second end pivotally connected to a rear wheel ; - a front part extending between said steering tube and said central portion , wherein said front part comprises a first frame side and a second frame side separated in the direction of the width (X) of the vehicle, wherein said frame sides are made of a first metallic material having a first modulus of elasticity, further comprising at least a pair of connecting plates wherein a first plate connects said engine assembly to said first frame side and a second plate connects said engine assembly to said second frame side , characterised by said plates being made of a second metallic material having a second modulus of elasticity lower than said first modulus of elasticity of said first material constituting said frame sides of said front part of said frame , wherein said front part of said frame comprises first portions extending from said steering tube to corresponding second portions , extending between said first portions and said central part of said frame , wherein said second portions have a mono-component configuration and wherein said first portions have a lattice configuration, wherein each plate of said pair of plates (16A-16B) connects a component (51A-51B, 52A-52B, 53A-53B, 54A-54B) of said first portion (151A-151B) of a corresponding frame side to a portion of a cylinder head and/or of an engine block of said engine assembly . - a steering tube to which a steering assembly that controls a front wheel is pivotally connected; - a central part to which is hinged a first end of a fork which also comprises a second end pivotally connected to a rear wheel ; - a front part extending between said steering tube and said central portion , wherein said front part comprises a first frame side and a second frame side separated in the direction of the width (X) of the vehicle, wherein said frame sides are made of a first metallic material having a first modulus of elasticity, further comprising at least a pair of connecting plates wherein a first plate connects said engine assembly to said first frame side and a second plate connects said engine assembly to said second frame side , characterised by said plates being made of a second metallic material having a second modulus of elasticity lower than said first modulus of elasticity of said first material constituting said frame sides of said front part of said frame , wherein said front part of said frame comprises first portions extending from said steering tube to corresponding second portions , extending between said first portions and said central part of said frame , wherein said second portions have a mono-component configuration and wherein said first portions have a lattice configuration, wherein each plate of said pair of plates (16A-16B) connects a component (51A-51B, 52A-52B, 53A-53B, 54A-54B) of said first portion (151A-151B) of a corresponding frame side to a portion of a cylinder head and/or of an engine block of said engine assembly . <EOS>