In the early 1990's almost all small mountain bike companies had
off-road tandems in their line-up. Tandems were a relatively small
market and the bikes were expensive which limited the number sold.
Campagnolo entered the mountain bike component wars in the late 1980's
and stumbled badly. By 1992, they improved the components
dramatically but the combination of a bad start and an unfavorable
exchange rate limited the appeal of the Campy parts. Within the
range of Campy parts, they offered some off-road tandem specific parts
such as hubs, cranks and brakes. Take the off-road tandem niche,
add niche within a niche parts and you end up with an uncommon bike.
New information from Jeff Linsday
indicates that there were a total of 10 Mountain Goat tandem
bikes: 3 early ones and 7 Lombada Goats.