Kevin, do you have any thoughts about weight limits for steel 531 or 753 frames? Some of us ask about it, many here opine opinions, but none (well, maybe a few) have anything like your experience. I know I never heard of any weight limits or ratings in my earlier riding days, say late '60s through mid-80s. Cautions, that if you're going to jump or be rough in the bike a heavier wall thickness might be a good idea, but those are suggestions, not ratings.