>In a message dated 12/2/05 10:35:22 AM, heine93@earthlink.net writes:
>
>>but 7/10 always has been the
>>standard.
>
>Hi Jan,
>In my experience-which only goes back to the early 70s-6/9 was the standard
>and 7/10 was only used on large bikes. Personally I use 7/10 or SP for
>downtubes on my bikes-I'm 6'3" and 215-and lighter tubes for the rest.
>Phil Brown
I need to clarify: in France, tubing is spec'd by the thickness in mm at the center. So a 9/6/9 tube is called 6/10 mm.
What it really means nobody seems to know - after all, nobody cut open the tubes to measure wall thicknesses in the middle! And Reynolds tubing seems to have varied even for the same nominal sizes...
--
Jan Heine, Seattle
Editor/Publisher
Vintage Bicycle Quarterly
c/o Il Vecchio Bicycles
140 Lakeside Ave, Ste. C
Seattle WA 98122
http://www.vintagebicyclepress.com