Hello, up for sale is a 1989-90 1st Generation Scott Aero Bar. The first retail version following Greg Lemond's successful 1989 Tour De France victory debut with the bars. Excellent original condition, about as nice as you will see. For standard 23.8mm road and bullhorn handlebars with 25.4, 26.0 and 26.4 stem clamp diameters. Aero bar clamps to the smaller diameter of the handlebar on both sides of the center section. Extension tapers from 155mm to 125mm center to center, with a 310mm length and 190mm center to center on the arm rests. Just what you need for your classic Bottecchia time trial bike. Also are great for mountain touring and gravel bikes with standard (non-oversized) road bars. Buyer to pay $12.40 USPS Priority Mail shipping with tracking. Thanks for looking!