I always thought a 979 looked nice in 91 Campagnolo or Athena, those castings just seem to compliment the frame so nicely (check my 992 links below). But after riding these old parts you won't half miss your Roubaix, old Campagnolo 8sp can be hard work esp the calipers. The problem you have is that the 979 is actually a very old frame so fitting period kit might prove disappointing. I can't think of much 1992 kit I could use on my rides.
After living in France for five years and seeing a lot of Vitus builds I do think nothing looks nicer than French components on this frame esp Stronglight cranks, Modolo brakes, Mavic wheels & Simplex gears. Or failing that, go all-out Mavic with starfish crank ooh lala. Most of the 979's I see here are triples due to the Pyrenees, makes for a good looking bike.
"Lucho" Herrera's Vitus was usually kitted out with Mavic gear, although his was a carbon job (pretending to be a Mercier!!) rather than an alloy frame.
Personally, if I was going down the all-French route I'd plump for New Success as certain aspects of the design (chiefy the use of steel or Ti bolts rather than those pesky shear-prone Ergal ones; I once got stranded on the moors above Guiseley thanks to a knackered anchor bolt on a 841 rear mech - my other half at the time had to drive out and give me a lift
) make it more durable than Mavic, if a tad heavier. Mind you, Mavic's "every bit replaceable", circlips-with-everything design philosophy was admirable.
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