At 165,I believe you're well within limitations of most bikes that have limits. Stephen Roche rode Vitus. Others too of course. The frames are heartier than one might suspect. Some vitas frames went away more due to problems with the lugs, mainly top-tube to head. They didn't fail in service as far as while ridden, the upper lug at the top tube could shatter when servicing the headset for example.Not to make you fearfull,the mech. doing the bike should succeed,not iffy in the future once he disassembles it,he and the frame are out-of-the-woods so to speak. Such problems have plagued alum.-lugged frames,still do.