Awheel loader, comprising: a travelling wheel; a drivetrain including an engine, a power transmission mechanism and a work implement pump, the power transmission mechanism being configured to rotationally drive the travelling wheel by a driving force from the engine, the work implement pump being configured to be driven by the engine; a start switch for starting the engine; a work implement configured to be driven by a hydraulic oil discharged from the work implement pump; a mode selecting unit configured to generate an operation signal indicating one selected from a plurality of control modes related to the controlling of the traction force of the wheel loader including a predetermined first mode and a second mode in which the traction force is controlled to be smaller than the traction force in the first mode, wherein the mode selecting unit is configured to be operated by an operator in order to select one of the control modes; and a controller configured to obtain the operation signal from the mode selecting unit, characterized in that the controller is configured to control the drivetrain in accordance with the selected control mode, and start controlling the drivetrain in the second mode when the start switch is turned on, wherein a maximum traction force in the first mode is the largest among maximum traction forces in all the control modes, and wherein the controller is configured to determine a work phase of the vehicle, and when the second mode is selected among the control modes, the controller is configured to control the maximum traction force in accordance with the determined work phase. a travelling wheel; a drivetrain including an engine, a power transmission mechanism and a work implement pump, the power transmission mechanism being configured to rotationally drive the travelling wheel by a driving force from the engine, the work implement pump being configured to be driven by the engine; a start switch for starting the engine; a work implement configured to be driven by a hydraulic oil discharged from the work implement pump; a mode selecting unit configured to generate an operation signal indicating one selected from a plurality of control modes related to the controlling of the traction force of the wheel loader including a predetermined first mode and a second mode in which the traction force is controlled to be smaller than the traction force in the first mode, wherein the mode selecting unit is configured to be operated by an operator in order to select one of the control modes; and a controller configured to obtain the operation signal from the mode selecting unit, characterized in that the controller is configured to control the drivetrain in accordance with the selected control mode, and start controlling the drivetrain in the second mode when the start switch is turned on, wherein a maximum traction force in the first mode is the largest among maximum traction forces in all the control modes, and wherein the controller is configured to determine a work phase of the vehicle, and when the second mode is selected among the control modes, the controller is configured to control the maximum traction force in accordance with the determined work phase.