Originally Posted by
fietsbob
I expect he specified it for added stiffness, since the alternative in TI
with a same as steel outside diameter would requite a much thicker tube wall..
95 pound asians may be fine with a noodly frame as long as they weigh less..
a) Brompton (as well as the UFB) has rear suspension, which will give WAY more than any possible frame flex anyway.
b) Fork and rear frame has much thinner tubing than the main frame, and they flex way more than main frame.
c) Long seatposts (especially carbon or titanium ones) flex a lot too.
d) Many people that weigh ~200lbs are riding their titanium brompton (clones) now and say they feel just the same as the original steel ones.