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Information needed - Colango Du-Al Frame(4 posts)

Information needed - Colango Du-Al Framedcarlon
Nov 27, 2002 9:35 AM
Hi: I am looking for any information on the Colnago Du-Al frame. Thanks.
Du-Al ????C-40
Nov 27, 2002 9:48 AM
Never heard of this term. See for info on all current frames.
do you mean the derosa dual? (nm)Frith
Nov 27, 2002 10:41 AM
A little help, but not muchjhr
Nov 27, 2002 11:50 AM
I will assume because of the timing of this post you have seen (and are considering bidding on) the 60cm Du-al listed on E-bay.

Colnago has made three types of frames with a double downtube, the bi-titan (titanium), the bi-carbonio (carbon, somewhat of a predecessor to the C-40), and the Du-Al (Aluminium version of the bi-carbonio)(the aluminum model also came in a cyclocross version)(my model name, nomenclature may not be exactly accurate). The Carbon and Aluminium models were made by Alan (a very reputable Italian company who made glued and screwed aluminum and carbon frames not unlike vitus [only better in my opinion]), to Colnago's design/specification. The titanium model (ridden by Tony Rominger when he was with Clas) was made elsewhere (rumour was they were Russian made). The titanium models did have problems with breaking at the welds (I have seen some examples where clearly the welding cite was contaminated with oxygen [make the titanium brittle]). The carbon and aluminum models were glued and screwed, only the titanium versions were welded. As far as I know the Alan built models have no history of failure.

Ernesto designed the dual downtube as a way to stiffen the frame. The theory was that the wide attachment points to the bottom bracket would stiffen the frame. Who knows if this worked in practice. Basically the aluminum and carbon models are identical to then existing Alan products or designs with the exception of the dual downtube, the bottom bracket shell and the bottom head tube lug (to accomodate the dual down tube)(I assume some proprietary geometry claims were also made). I think these frames were in production for only a short time (the idea never caught on)in the late 80's or early 90's. I know I have a video of Liege-Bastone-Liege for 1993 and Tony Rominger is riding a bi-titan (titanium version). The C-40 first appeared in 95 or 96 and the bi tube frames had certainly disappeared by then.

I owned an Alan made aluminum Guerciotti (identical to the du-al except for the down tube issue) and loved it. It was not a stiff bike, but it was light, comfortable, and it had no paint to chip. To this day I kick myself for selling it.

If I could find a 'nago du-al in my frame size I would snatch it up in a minute.

Hope this provides some useful insight. Hopefully others can provide you with greater detail.