An assembly for converting a motorcycle from a two wheel vehicle into a three wheel vehicle having alternate left and right side front wheels. The assembly is constructed to cooperate with an underlying motorcycle frame without physically altering the underlying motorcycle frame. The assembly includes a center frame assembly that is securable to the underlying motorcycle frame and which aligns a support tube of the assembly with a passage defined by a head tube of the motorcycle frame. Respective A-arm assemblies are pivotably secured to alternate lateral sides of the center frame assembly and a steering arm is pivotably attached to each A-arm assembly. A tie rod extends inboard from each steering arm to an area bounded by the center frame assembly and operatively cooperates with a steering shaft that passes through the head tube and the support tube to effectuate turning of the left and right side front wheels.