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Mick B1	25/02/2020 20:30:23
2444 forum posts 139 photos	Posted by John MC on 25/02/2020 10:42:52: Looks like an investment casting to me. Also looks like a Brompton hinge but looking at the picture of the unmachined hinge, they look like sand castings. As for material, my money is on malleable iron. John I wondered if it was a shell-moulding.
ega	25/02/2020 23:15:25
2805 forum posts 219 photos	Posted by lfoggy on 25/02/2020 19:00:16: I've had two Brompton frames fail in normal use. Both at brazed joints. To be fair to them they did replace them without any question. Given up on Bromptons now, but not becuase fo frame failure - I just no longer need the folding feature. Odd bikes to ride. Very wobbly, fast steering and hard work, particluarly up hills. And their small wheels don't like potholes ! Interesting, as I understand they have a sophisticated testing procedure and the failure rate is low. If you think the Brompton is wobbly you should try the Bickerton! I agree about the hills, hence the attraction for some of the electric version.

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