Annie & I use our 8 speed aluminum frame dahons on the boat. They are billed as 22 lbs. and I would not want to wrestle with more weight. The corrosion issue is not worth extra money since there are so many other non aluminum non stainless parts to rust but light is good. They do open up areas ashore a lot, our cruising mantra is 2 or more days without raising the anchor so it is worth the time to build. We fit both bikes and us in or 10' portabote. After unfolding our dingy then unfolding our bikes some folks have asked if we were stowed folded up also.