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@Regal
Oversize won't be any stronger or weaker than regular 631 but it'll make a stiffer frame, especially at larger sizes (as a 6+ footer, I'd always take oversize where possible). If the frame's going to fail from a heavy vertical impact, it'll be at the joins, particularly the seatstay / seat lug junction. Mine's always felt fine with bunnyhopping/riding off kerbs, but I do it quite carefully. Guess you never know until it goes crack...