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titanium
Obviously he's not going to use Ti, but as a matter of simple mechanics it's a ludicrous suggestion since it's about half as stiff as steel.
Increasing wall thickness of the steel tube is a game of diminishing returns, but since the starting point is probably around 0.1 times the OD, the initial gain from adding 50-100% is going to be significant.
gbj_tester-
@MisterMikkel pretty sure that as tester says, the steel seatpost will still make a massive improvement over the hollow alu. It’s 25.4 by the way. I remember seeing one on bankrupt bike parts for an affordable sum.
Once I feel a bit more confident with the welder, I’d plan on tacking a small angled support to the seatpost that can be clamped to the frame - non-permanent but just enough added support to reduce flex.
That, or just get something that clamps to both the frame and to the seatpost for maximum non-permanence. I was thinking maybe something like those kiddy-ride clamp bar things?
Don’t wanna damage the frame, but also don’t wanna damage my ass.
pdlouche
Bike still looks like a right hoot!
Solid steel post is probably not going to do much else than add weight. You'd be better off with an internally ovalized/butted steel tube. Or something like those titanium jobbies they use on bromptons if the diameter fits.