3 points
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Wobbling would be more influenced by the caster angle than anything (which is really the rake angle on a bicycle or motorcycle). It’s the same reason cruiser motorcycles are easier to handle than sport bikes at lower speeds.
Straight bars would be more responsive since they’re a shorter lever, while the curved bars are a longer lever, meaning it takes more arm motion to turn the wheel, so those bikes should be more stable/less twitchy.
Must be more at play with the wobbly riders you’re seeing.
