Common on European utility bikes, a front wheel stabilizer makes loading front racks easier Constructed with a spring connecting the fork to the downtube, it adds a subtle self centering action to the front wheel so fighting the bike while loading gear is unnecessary. Also effective to assist in steering when hitting potholes or road debris Comes in small and large. Small model fits bikes with a downtube of 11/4" (31.8mm) or smaller. Large model fits bikes with a downtube of 1-1/2" (38mm) to 2-7/16" (62mm)