A bicycle including a frame that has a bottom bracket and a crankset attached to the bottom bracket. The crankset includes a sprocket assembly and a spider that has a flexible arm coupled to the sprocket assembly. The bicycle also includes a pedal coupled to the crankset and operable to propel the bicycle in response to a force acting on the pedal, and a sensor apparatus. The sensor apparatus has a sensor element positioned to sense a force transferred from the pedal to the sprocket assembly and indicative of the force acting on the pedal.
