Bikes are like children. You love them all equally, but each for their special qualities. I have 3 bikes, one roadie, one mountain, and one commuter. What I've found is that you need to talk to your bikes. When you take one out, give the others a little pat on the seat, and reassure them that their turn will come. Be sure and give all the tires a tender squeeze, feed them a little air even if they aren't going out for awhile. You can keep them all happy!