Hi George,
SV 980 is indeed comparable to Reynolds's 531. Reynolds 531, is a
mang-moly steel the TS is 116,500lb/in2, and Super Vitus 980 made by Atelier
de la rive of France this tube set is made of chrom-moly steel 18m5 is SV's
coding which is similar to 25crmo4 used by Dedacciai and Columbus in some of
their sets 18m5 has a TS of 142,200lb/in2. The main triangle is .9mmX .6mm
wall thicness, chain stays are .8mm,
the seat stays are.6mm.
Super Vitus was not as popular in the USA. as the other big 2
companies but in my humble opinion if was better. I built many frames from
Super Vitus 980 and 983 and found it to be easy to braze and very consistent
in material dimension.
I hope I helped.
God bless
Anthony Mezzatesta
Mezzatesta custom cycles
Cranberry PA.16066
724 778 8224
in cooold and snoowy west PA