Q: Why one piece sleeve style fork mount is better than end cup style mount? A1: This fork mount has minimal number of parts and each sleeve is not that tiny, which means you have less chance to lost them. A2: This bike fork mount adapter can mounting with 4 screws on both sides, it is more secure than thoes ones which screws only at one side. A3: Unibody axle sleeves always at same horizontal line, if 2 end cups insert at both side, it might not at the same axle line. A4: The self-locking structure make it easy to replace the sleeve.