Originally Posted by
caloso
Ride with her on your easy days, or on your cooldown after the local hammerfest. Use your CX bike with the knobbiest tires you can find, and stay in the small ring. Or build up an undergeared FG so you'll be forced to spin like a maniac to keep up (and that's actually really great training).
No need to build a different bike, just turn in the "high limit" screw on the front derailleur 3 turns turns (or whatever is appropriate) before the ride. Should be an even number of turns so shifting can be restored properly and easily when the OP is on his own.
Don in Austin