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In all the image results for "Brompton World Championship" the bikes with S bars look to also be running the more curved S stems. I think M stem with S bar = hella short reach.
This is my debate, i feel like i remember people swapping the stem to get the front end low, but the M type stem loses the forward bend and would ruin the reach for me.
I think there is also pre and post 2017 M type stems which are different lengths
What is the mod the Brompton racers make to get the super low front end?
M-type stem with S-type bars?