Originally Posted by bostontrevor
My understanding is that 708 offered superior rigidity over 531 for touring loads and that it was specifically designed for such use.
According to a Reynolds catalogue I have in front of me:
Reynolds 708 CLASSIC
"A receint development from Reynolds, the name describes the purpose.
The main tubes of this set have a new and ingenious inernal profile.
The profile is designed to maximise lateral stiffness and strength in the direction of the known loadings, which result from the punishing road surfaces and the extreme rider applied deflection loadings experienced on the brutial classic racing courses."
No doubt 708 is stiffer than regular 531, however 531 SUPER TOURIST is quite a bit thicker yet which makes it a better choice for loaded touring.