Just thought rpm was Axiom 8.0 size which the poster thought would b 2 big but haven't compared specs. But to finish the thought, since u are looking for a used boat, I have had good luck river running with a one size bigger play boat. Like I said, I can cram myself into some small play boats for the most throw around ability, but a med is good for river play. Kept my Necky Chronic and Mission when they went out of style and they are great river runners. Paranha mediums might work also as they tended to b narrower and have more rocker. Older are usually better as the newer bulbous, poppy boats tend not to roll quite as easily. Should b boats coming on the market soon. Happy paddling!