Vintage Schwinn Sierra Mountain Bike.

26" Tires. (26 47/47). 23" Frame. 4130 Chrome-Moly Main Tubes and Stays. Black Smokey Chrome Color. Made in Taiwan by Giant for Schwinn. All Shimano Hardware. SIS. 3x6 gears. Date stamp on head badge is 978. Which is day 97 of 1988. April 6. I am the original owner. Bought in Williston ND. The stamp on bottom of frame is GZ666166. Haven't found a reference to that yet. The bike is all original except for handle grips, seat and tires. Came with sort on knobbies. I put on a more road friendly tire with good grip. Probably not more than 100 miles on these. Added a kickstand tire pump. I had it all tuned up a few years ago and haven't ridden since. Functions great, nothing wore out. A real nice road and street bike. Always stored in controlled environment. See pictures for more information.