it's not the bikes
it's not the bodies
it's gonna be your attitudes toward each other

you have to want to ride together

I can't play tennis with my wife. it's too hard to do that sport with less effort. but I can bike with her because its easy to ride easy.

every now and then you're gonna want to take off and feel your maximum effort rewarded so either wait for her to catch up or take an occasional ride on your own.

you can also handicap yourself by having knee surgery or something else like that!