1980 Schwinn SX-2000 BMX Bicycle.
from the 1980 Schwinn catalog….
The Sting, by Schwinn, was the first of a new generation of BMX racing machines. The SX-2000 bi-oval is the second. In terms of frame geometry, the new SX-2000is identical to the incredible Sting—a longer 5-inch head tube reduces the radial load on head bearings and stress at critical head tube joints. The SX-2000 also has ovalized top and down tubes to help spread stresses more evenly and the entire main harp is light 4130 chrome-moly tubing. Equipped with chrome-moly handlebars, quick-change alloy sprocket, anodized aluminum box rims and other competition parts and components, the new SX-2000 will soon be the workhorse on BMX tracks across the country.
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