Bike-Tech is covered in Gallery 2 Manufacturer section. There you find catalogues with information on the frames and specs. Very cool was the frame with the two side paintschame, like FAT had too.
Bike-Tech was the brand of Markus Storck of Germany. Storck was importer of various high end US Cult brands too. Bike-Tech were tastfull simple very well made frames. Many built with Tange Prestige tubesets. Bike-Tech was discontinued around mid 90s I think. Aluminum and suspension era had take off, Markus lost his distribution of Klein and he wanted to try something new: Storck. In fact initially heavily Klein inspired aluminium (and carbon) FS and HT bikes.
Production of the Bike-Tech frame was outsourced to the little run productiuon shop Toyo in Japan. Toyo built for Ritchey and Rocky too and still build for Rivendell and they have their own brand for the Japanese market: Testach >>
http://www.tsss.co.jp/catalog/vol15/testach.pdf
You got the Bike-Tech from eBay.co.uk ?