Without knowing what frame you have, no one can give you the corrrect answer. The size of the head tube will determine if the fork will fit. If your frame has a head tube that will take a 44mm lower headset cup, then the fork will fit by just changing the lower headset. If the frame has a head tube that was designed to fit only an 1 1/8 to 1 1/4 tapered steerer, then there is no way to fit the 1 1/2 lower.