The Simson Fork Spreader Excellent to extend the rear fork to create enough space to exchange the bicycle tire without having to take the wheel out of the frame. The Fork Spreader has a luxury design with plastic guards to prevent damage to the fork. Screw the fork Spreader until there is space between the frame and the axis of the hub so that the tire can come out. Note: The Fork Spreader is only suitable for use with a steel frame! Place the Fork Spreader between the two blades of the fork.