a motorcycle or bicycle having a fork with swappable trail adjustment blocks which hold the front axle to the fork . trail can be adjusted without removing the forks or even loosening them in the triple clamps , and without altering ride height or rake angle . brake caliper mounts are swapped when the trail adjustment blocks are swapped , moving the brake calipers the same distance and direction as the axle , to maintain a constant radial distance from the axle to the brake pads . the brake caliper mounts pivot on the forks , enabling the brake calipers to be swung outward so the wheel can be changed without removing the brake calipers from the forks .