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 of the vehicle, wherein said frame sides (15A, 15B) are made of a first metallic material having a first modulus of elasticity, further comprising at least a pair of connecting plates (16A, 16B) 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 (16A, 16B) 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 (15A,15B) of said front part of said frame, wherein said front part of said frame comprises first portions (151A, 151B) extending from said steering tube to corresponding second portions (152A, 152B), extending between said first portions (151A, 151B) and said central part of said frame, wherein said second portions (152A, 152B) have a mono-component configuration and wherein said first portions (151A, 151B) 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 (15A,15B) 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 of the vehicle, wherein said frame sides (15A, 15B) are made of a first metallic material having a first modulus of elasticity, further comprising at least a pair of connecting plates (16A, 16B) 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 (16A, 16B) 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 (15A,15B) of said front part of said frame, wherein said front part of said frame comprises first portions (151A, 151B) extending from said steering tube to corresponding second portions (152A, 152B), extending between said first portions (151A, 151B) and said central part of said frame, wherein said second portions (152A, 152B) have a mono-component configuration and wherein said first portions (151A, 151B) 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 (15A,15B) to a portion of a cylinder head and/or of an engine block of said engine assembly.