I have an M type currently and want to make the front end lower. Looked at just putting flat handlebars on but no bike shop in London is willing to cut the cables to size for me. What is the exact difference in height between M stem and S stem so I can buy a riser bar and fit S cables on?
The difference in height at the bars is 89mm. The length of the stem isn't shown on any of the Brompton diagrams, which is different between pre- and post-2017 M bar shapes.
tbh I think there's enough other variables (bar width, bar angle, cable angle, etc) that knowing the difference in height isn't going to help you. I'd leave the M cables on and eyeball how much excess you need to lose.
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