crosscheck wrote:
As has been suggested, buy the top tube adapter for your wife's bike.
Just a side note, modern men's and women's higher end mountain bikes have similar frame geometry as demonstrated by the photo of my mountain bike with the top tube adapter and both of our touring bikes have sloping top tubes.

Gooseberry Mesa, Hurricane, Ut.
Dave
yep, i have two full suspension mtn. bikes that don't have the traditional top tube and i use a similar adapter for both.
lots of bikes anymore, don't have the traditional top tube.