So hows it measured? I was looking at my bikes and realised they're different stem lengths. had a look and there's no ref to length, although theres a handy ref to torque. I contemplated a shorter stem on the commuter, but to get a shorter stem.... I need to work out whats on it now. I initially thought, shortest point between the centrelines of the steerer and handlebars? Then considered angles and thought it could be the horizontal distance when the steerer is vertical?