The Paddleboy Scupper Pup comes with two sizes of crossbars in order to accommodate almost any size sit-on-top kayak. Scupper holes of the sit-on-top must be at least 3/4" diameter. The Scupper Pup will carry 200 pounds and disassembles, without tools, into four parts. The tomato-red wheels release with a tug of a cotter pin.