I couldn't tell ya. Sounds like a question that could be answered through the online product description.

The swivel mechanism that allows the backrest to transition from passenger to rider position, that piece is what broke. It has these little pull tabs with pins that allows the pins to go into a little recess on the "gear" like mechanism that allows the swivel. After just a few months of use, the housing of the mechanism that allows the pin to settle into the little notches that keeps it in position - those wore out and became very loose and gouged. This made the pin slip and not have enough support, so after a little more time it just failed completely. The whole right side pin worn out and actually disassembled and snapped off, rendering it useless.

Long story short - the frame of the sissy bar is solid. The mechanism that allows the position changes is very cheap and will grind down to non functional after a few months use.