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Its something they test at the factory. Hence why they didn't just put M bars on an S stem and call it the H type (although in the end that is sort of what they did). But they put that setup through a bunch of stress tests to see if it could handle the different loading.
Its probably fine but if you'll not miss it I'd chop them.
I've raised my bars a tad but with a stem raiser, rather than riser bars. Bit like this: http://www.thorusa.com/images/dahon/technical/aberhallo2.jpg (the black bit).
Rode the Brompton to work today and I'm considering chopping further the bars. I'm concerned about the greater leverage over the stem assembly and main frame with wider bars. I had chopped the last risers I used to the same O/A width than original Brompton bars. Wider bars today felt like they could ultimately amplify/accelerate steel fatigue, especially at hinges. I'm 95kg...
Any thoughts / precedents on this?