The original BiTitan was first produced in 1993 AFAIK. It was a development of the Alan made Carbitubo and a previous (short lived) Alan manufactured/marketed aluminium model. The only rider I know of who used the Carbitubo with any frequency was Rominger in his early Clas years, some of the Buckler guys used them as well (Rooks used to have a resprayed TVT though). For the '93 Vuelta Rominger had two Bititan's, one built as a silly light bike (with drilled components harking back to the days of Merckx) and the other as a more normal bike along with two Carbitubo's. I actually got to ride with Rominger at the beginning of '94 near Nice a couple of times, and he was using (rebuilt with Dura Ace) the same frame he had used for most of the Vuelta and the Tour of that year. I saw him last year on a ride, he was on a Bititan still. When the C-40 became available in 1994 he had to switch, but in the Tour he was still using a Bititan, I have a picture from his Giro ride of '95(?) where he is still on a Bititan also.
The apparent goal was to increase lateral stiffness, while also reduce vertical stiffness to make a stiff, but comfortable frame. While it didn't really work, they were nice frames that had their fans (I'm one, in '95 I raced on a Bititan and a C-40, the C-40 hardly got ridden) despite the reported problems with them. I have never seen a broken one, or know anyone that has personally, but everyone has heard stories about how they break....
There is an Italian company called Piton who make a steel frame using specially drawn Dedacciai tubes with a lugged double downtube, it's kind of neat, and in 20 years if I put one in a box now I bet someone on Ebay would want it for it's curiosity value (c;
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FiR - As used by Kelme, individual and team winners of 2000 La Vuelta, mutiple Tour de France stage winners and the current World Cyclo Cross Champion Richard Groenendaal.