Detel was a small company from WI circa 1985. Brent Emery (of Olympic cycling fame) was the plant manager. The investors pulled out soon after operations started, so not many bikes were made.

There were only two models I'm aware of, both road bikes, the Legend & the Marathon. Both used Ishiwata tubing - I believe 022 and 024.

The bikes are OK but not particularly valuable. I ran into Brent at a bike swap in Milwaukee and pretty much confirmed everything above with him.