A vehicle comprising: a vehicle frame defining a longitudinal centerplane extending longitudinally and vertically; a left front wheel mounted to the vehicle frame; a right front wheel mounted to the vehicle frame; one rear wheel mounted to the vehicle frame; an engine mounted to the vehicle frame and comprising: a crankshaft defining a crankshaft rotation axis extending generally longitudinally, and a cylinder block defining at least one cylinder disposed such that a cylinder plane extends generally longitudinally and vertically, the cylinder plane containing a respective cylinder axis of each of the at least one cylinder and one of: the crankshaft rotation axis and a line parallel to the crankshaft rotation axis, at least a portion of the at least one cylinder being disposed forward of a front wheel plane, the front wheel plane extending laterally, vertically and tangentially to a rear edge of the left front wheel and the right front wheel when the vehicle is steered straight ahead; a transmission assembly operatively connected to the crankshaft and being disposed longitudinally rearward of the engine, a straddle seat being mounted to the vehicle frame, the straddle seat being disposed at least in part longitudinally rearward of the transmission assembly; and a left footrest and a right footrest mounted to the frame, the left footrest being disposed vertically lower than the straddle seat and on a left side of the longitudinal centerplane, the right footrest being disposed vertically lower than the straddle seat and on a right side of the longitudinal centerplane, the engine being entirely disposed, in a lateral direction of the vehicle, between a lateral position of a center of the left footrest and a lateral positon of a center of the right footrest characterized in a driveshaft operatively connecting the transmission assembly to the rear wheel for rotating the rear wheel, the driveshaft extending generally horizontally and longitudinally. a vehicle frame defining a longitudinal centerplane extending longitudinally and vertically; a left front wheel mounted to the vehicle frame; a right front wheel mounted to the vehicle frame; one rear wheel mounted to the vehicle frame; an engine mounted to the vehicle frame and comprising: a crankshaft defining a crankshaft rotation axis extending generally longitudinally, and a cylinder block defining at least one cylinder disposed such that a cylinder plane extends generally longitudinally and vertically, the cylinder plane containing a respective cylinder axis of each of the at least one cylinder and one of: the crankshaft rotation axis and a line parallel to the crankshaft rotation axis, at least a portion of the at least one cylinder being disposed forward of a front wheel plane, the front wheel plane extending laterally, vertically and tangentially to a rear edge of the left front wheel and the right front wheel when the vehicle is steered straight ahead; a crankshaft defining a crankshaft rotation axis extending generally longitudinally, and a cylinder block defining at least one cylinder disposed such that a cylinder plane extends generally longitudinally and vertically, the cylinder plane containing a respective cylinder axis of each of the at least one cylinder and one of: the crankshaft rotation axis and a line parallel to the crankshaft rotation axis, at least a portion of the at least one cylinder being disposed forward of a front wheel plane, the front wheel plane extending laterally, vertically and tangentially to a rear edge of the left front wheel and the right front wheel when the vehicle is steered straight ahead; a transmission assembly operatively connected to the crankshaft and being disposed longitudinally rearward of the engine, a straddle seat being mounted to the vehicle frame, the straddle seat being disposed at least in part longitudinally rearward of the transmission assembly; and a left footrest and a right footrest mounted to the frame, the left footrest being disposed vertically lower than the straddle seat and on a left side of the longitudinal centerplane, the right footrest being disposed vertically lower than the straddle seat and on a right side of the longitudinal centerplane, the engine being entirely disposed, in a lateral direction of the vehicle, between a lateral position of a center of the left footrest and a lateral positon of a center of the right footrest characterized in a driveshaft operatively connecting the transmission assembly to the rear wheel for rotating the rear wheel, the driveshaft extending generally horizontally and longitudinally.