retrobloke
Dirt Disciple
Thanks for the replies everyone
The 1993 & 1994 Explosif had a ribbed down tube not a spiral.Tange made a spiral tubing like that. I know Kona used it on their flagship MTB in the early nineties. I have a weak spot for unusual tubing. I love my Colnago Conic SLX, as it was the first bike to have an expanding downtube. Love my lugged Gilco-tubed Cinelli MTB too. Two bikes I'll have 'til I die.
At least Ciöcc and Dancelli used the Mannesmann / Oria ML 25 spiral tubes for a few mountainbikes (in the late 80th/ early 90th). I will try to post some pictures of the Ciöcc frames I have.Oria of Italy made a tube set like this featured on some Ciocc/Conti frames . I will see if I can find a picture and tube label . It was a road spec tube set so perhaps not seen on MTB/ tourers.