Originally Posted by
Classtime
Get bars so that her hands are 40mm apart when she is in most normal position.
Example: If I rotate my hands from a "on the hoods" position on 40mm bars, to what might be flat bars, I need another 5 mm on each side.
Cut those bars a bit.
Having her hands 40mm (4cm, or 1.6") apart should provide her with excellent control over her bike. I believe this was a thing a few years ago, until the fixie kids grew up