if i have choice between NOS and used, and the price is not stupid on the NOS i will use NOS.
at the same time I am building a set of duplicates of ultegtra8000 mechanical group, my own NOS for future use
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Life is too short not to ride the best bike you have, as much as you can
(looking for Torpado Super light frame/fork or for Raleigh International frame fork 58cm)