They were also made tandems where they were in direct competition with the carbon fiber builders like Calfee. Magnesium has very unique properties which are susceptible to some form of corrosion. They were beautiful frames but probably do not have a significant value now in the resale used market. This is a post from the tandem forum.
Paketa No More?
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1980's Spectrum (Currently in a Box awaiting a modern build), 1995 Merckx Campy Centaur 10, Co-Motion Speedster, Bushnell Tandem,