The Specialized Rock Combo is considered to be the first gravel bike. Specialized referred to the unique design as a "hybrid mountain/road bike."
I found this bike in 2015 with the original parts including tires (little wear but rotted). The bike has all the original parts, including chain, with exception of tires and saddle. I put about 350 miles on this bike after refurbishing the wheel grease, and deep cleaning of rear derailer and chain of hardened grease. BB and headset have not been touched. Specialized manufactured 500 Rock Combos in 1989. This bike has been professionally boxed for shipment at my LBS. I can ship anywhere in continental US for 190.00 via Bike Flights/UPS Ground.