Originally Posted by
adgrant
The PRS-20 has a center column which can be raised so I don't see why you would have to kneel. If you need to work on the fork/headset, the bike can be held by the rear dropouts.
Old bottom bracket mount racks didn't have a height adjustment. At least that's an improvement. But looking at the way you have to clamp the rear wheel in to work on the fork looks like a royal pain. Considering that the price is about the same as a PCS-4 and that you have to disassemble a bike rather than just clamp it with one hand, I don't see that it's better.