I wanted to build up a bike with a slightly shorter top tube and a different head angle to test out a few fit ideas for myself - the joys of getting older and less flexible! Plus, if I could make the seat tube short enough then my 10 year old son could ride this as well - which would be his first true 700c road bike.
I had this old frame hanging in the shop that had a dented top tube so I decided this would be a perfect candidate to do this conversion.
This frame was originally built in 1992 using a Tange Prestige Ultimate Superlight tube set - I upgraded the down tube to a "standard" Tange Prestige 28.6 O.D (.7mm x .4mm x .7mm) tube, and the super thin 25.4mm top tube from the set wasn't used either. Instead I used the 28.6mm (.6mm x .3mm x .6mm) original down tube as an "oversized" top tube.
It is no wonder that the top tube ended up with some dents and creases...This was, and is still, the only tube set I have ever seen with .3mm wall thickness - I think that is just a little too thin.
I updated the head tube to a simple 1-1/8" EC34 and used a TrueTemper S3 teardrop top tube. The existing seat tube was cut down a fair bit for the improved stand over clearance I wanted - this made for a fairly aggressively sloped top tube. I also removed the old above BB braze-ons and re-routed the cables under the BB.
The final color of this updated frame is a nice candy blue powder coat that almost changes colors depending on the surrounding area.
I can ride it now with a long 330mm seat post, and my son can also ride it with the seat slammed close to the top tube...
He is pretty excited about it and can't believe how fast a real road bike is.