Hi. I recently purchased a folding bike which I'm in the process of converting to electric. I'm a tall guy and I've raised the handlebars as high as they will go. I've noticed there's some engraved horizontal lines on the handlebar stem, which is height-adjustable, and i'm trying to work out why these lines are there. I don't know if they are minimum insert lines or something else. I'm basically trying to work out if I can raise the handlebars higher than the insert level where these lines are. Anyone got any ideas on what these lines are for? I've attached a couple of photos showing the lines and where they are. Many thanks guys.
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