My husband and I are 'best friends' but I can't imagine asking him to ride a pace that is unatural for him so we can ride together. We start and end a ride together, go to lunch together after, etc., but we each do the ride with our own peer group. Simple as that. And, when we do ride together, we do something else to equalize our speeds, he'll pull me all the way, and usually have some luggage or ride a slower bike.