that a Colnago cyclocross frame should be built up and raced got me thinking about this... do you still use your retrobike for its original purpose?
I've got a 1995 Gazelle Champion Mondiale that I plan to ride a crit race on, although it would just be as a fun thing to do... I wouldn't use it for an important race. Whilst the Gazelle (531 frame with Sachs New Success components) would have been raceable at the time, by today's standards it's too heavy, and the frame and quill stem are too flexy. Procycling did an article a while ago comparing a modern carbon race bike with a steel Pinarello with period parts. All the racers who tested the Pinarello hated it, and even felt that it was dangerous compared to a modern bike due to the flexy frame and poor brakes.
My Gazelle does get ridden, mostly on training rides and sometimes on commute duties. It's a stylish ride that gets lost of compliments, and it works well as long as I don't try to go fast or uphill. Interestingly, old steel frames do still get used on the track - Ross Edgar (or someone similar) rode some old iron (with up to date wheels, a Mavic IO and disc) at the Good Friday Track Meet this year.
Is anyone using their retrobike for its original purpose - racing, time trialling, cyclocross, touring, whatever? How do you feel that it works compared to a modern machine?