Abstract: A bicycle training wheel bracket support for supporting the bracket at a desired height, comprising a brace member having a first portion apertured to accommodate the threaded end portion of a bicycle rear wheel axle, and a second portion comprising a torque arm having a forked extremity for embracing a bicycle frame, a housing secured between the first and second portions of the brace member, a substantially vertically extending sheath secured within the housing for receiving the training wheel bracket, said sheath having a transversely disposed aperture extending therethrough and situated for alignment with a selected one of the bracket apertures, a movable locking pin supported within the housing for substantially horizontal movement into the sheath aperture and a selected one of the bracket apertures, said locking pin being spring-biased into said apertures for locking the bracket at the desired height, and at least one projection rigidly secured to the locking pin and extending through an opening in the