Patent ID: 8117923

Claim:
A bicycle bottom bracket force sensor, comprising: an outer portion; an inner portion dimensioned to receive and support a crank axle bearing that rotatably supports a crank axle rotatable about an axis of rotation, the inner portion being positioned radially inward relative to the outer portion; a first joining portion extending between the outer portion and the inner portion; a second joining portion extending in a radial direction from the outer portion to the inner portion with a first opening separating a first section of the outer portion from a first section of the inner portion, and a second opening separating a second section of the outer portion from a second section of the inner portion, the second joining portion being located between the first opening and the second opening; and at least one sensor mounting surface extending between the outer portion and the inner portion along the second joining portion, the sensor mounting surface having a strain gauge fixed thereto, the sensor mounting surface extending in a direction substantially perpendicular to a rotation axis of the crank axle when the force sensor is coupled to the bicycle bottom bracket.