been digging for info!!
i emailed the guy from John's link on tears for gears, and he got back to me almost straight away!
he has been investigating the particular bikes from Gan for several years as they are his favourite, here's what he sent me:-
I'd have to do some digging for it, but I found a '93 article that suggested they were using campagnolo spaced cassettes as early as '93, even though by all rights the DT shifters would be Shimano spacing. So clearly GAN had experience spacing their cassettes out for the '94 season when they started using Ergo. The link you gave reinforces that - that an ex-GAN wheelset has Campagnolo spacing. Whether its EXA or a custom spaced Mavic cassette, I can't tell.
If you look at pictures of the team running Ergo, you'll see that at least early in '94 they were running bits of tape right over where the Campagnolo shield would be. Really hard to tell since they're identical, aside from the logos and the internal ratchet. I think I have some '94 magazines where they say its Campagnolo, but I'm not positive. I'll dig a little and let you know.
Oh here's another tidbit - the GAN ergo's clearly said CARBON above a solid lever - same as a '94 record. Not sure the Sachs ever said carbon. An item to look in to perhaps?
FWIW, my money is on Campy (or Campag, if you prefer).
the link he's referring to is the ebay link to the mavic exadrive compatible wheel set that are genuine team gan parts.
aswel as this my friend Robin Wilmot who is following the TDF for cycling+ magazine came up trumps!! what a legend!!
he spoke to Graham Watson on my behalf, then while on a nighshift last night i got a text message saying send me your email, 5 minutes later i had an email from Grahm himself with the pic i needed!!
how effin cool is that!!
You have enemies? Good. That means you've stood up for something in your life.