Jess's stem was set up from the bike shop so that the bars were about 3" above the seat, maybe more. It was an awkward position that caused her to catch all sorts of wind, and it made the bike handling very twitchy.

I flipped her stem, but that made it too low, so I swapped stems with another bike. Now her bars are 1-2" lower than the seat. The result:

- Around 1mph faster average on our 57 mi loop.
- Better bike handling. She's less nervous around fast curves.
- Better climbing, because the front wheel doesn't hop around.

For her, it was a much better setup. YMMV.