Ich fahre auch erst seit 5 Jahren Rennrad...hehe.
Hier ist ein schöner Artikel zu Benotto.
http://machiine.com/2015/benotto-the-birth-of-a-hero/
"1984 is the last year of the historic “Italian Made” Benottos. Unfortunately some of the Benotto’s built in Mexico during this time suffered from the bottom brackets or head tubes cracking. This was due to inexperienced fabricators overheating the steel during the brazing process. The majority of Mexican Benotto frames on the road today were built well and others have reported that repairing the crack was a simple matter of rebrazing the cracked areas with bronze.
Some models like the Modelo 800 and 5000 were unaffected. Modelo 800 was made with Hi-Ten steel which can handle a little more heat and abuse while the Modelo 5000 was unaffected as it was still made in Italy during this period. Also, Benotto forks are outstanding forks. So if you do happen to own or come across a cracked Benotto that you don’t care to repair, salvage the forks."
Irgendwo hatte ich auch mal ne Auflistung der einzelnen Modelle und den dazugehörigen Bruch gesehen... Den Artikel finde ich aber gerade nicht ;-)
EDIT:
Hier ist der Artikel:
DO NOT RIDE YOUR BENOTTO!!!
Here's the reason why...
From the early 80's all the way to when they stopped sales of Benottos in the United States - Benotto frames failed. Only two models were spared...
Modelo 800 - Made with hi-ten steel was not affected.
Modelo 850 - Made with Columbus Zeta - cracked where seat tube entered the bottom bracket lug.
Modelo 1000 - Made with Columbus Zeta or Aelle - cracked where seat tube entered the bottom bracket lug.
Modelo 1500 - Made with Columbus Zeta or Aelle - cracked where seat tube entered the bottom bracket lug.
Modelo 2000 - Made with Ishiwata 019 - cracked where the seat tube entered the bottom bracket lug.
Modelo 2500 - Made with ??? - cracked where the seat tube entered the bottom bracket lug.
Modelo 3000 - Made with Columbus SL? - cracked where the seat tube entered the bottom bracket lug.
Modelo 3500 - Made with Columbus SLX - separated where the down tube entered the head tube lug.
Modelo 5000 - Made with Columbus MS / Gilco - not affected.
Basically these issues appeared when Benotto moved production to Mexico. The clinical judgement of a local frame builder was that the brazer in Mexico was overheating the tubes during brazing resulting in a premature onset of "brittleness".
Also, Benotto forks are outstanding forks. So if you do happen to own or come across a cracked Benotto, salvage the forks.
Gruß
Micha