My other bike's a Cervelo...

It's also worth remembering that a lot of good athletes pile on the pounds more easily once they've stopped riding simply because they lack the activity. Merckx is a case in point, although he slimmed down massively a few years ago when he started riding his bike again.

Blackburn CC's (my old club) president is quite a big bugger.
He's also a former world sprint champion.