[QUOTE=BabyCowHK;23344150]Not sure what's the version of your Birdy Classic. It could either be version 1 or 2, excluding the world sport. Hope these pictures help. You can probably forget about fitting a rear rack ......

Mine is essentially the same as the BD-1 you show, but a bit later, I think. Same seatpost clamp. What is confusing to me is how the rack interfaces with the seatpost quick release. On one side there's a black plastic flanged bushing, but on the other side nothing. Thanks for the pics.