Engineering:Shimano Total Integration
1. Main lever
2. Release lever
A. Pulling the main lever towards the rider applies the brake
B. Pushing the main lever towards the center of the bike downshifts one, two or three gears depending on how far the lever is pushed (right hand shifter) or changes from a small chainring to a larger chainring (left hand shifter)
C. Pushing the release lever towards the center of the bike upshifts one gear (right hand shifter) or changes from a large chainring to a smaller chainring (left hand shifter)
Shimano Total Integration (STI) is a gearshift system designed by Shimano for racing bicycles. It combines the braking and gear shifting controls into the same component. This allows shifting gears without having to remove a hand from the bars, unlike previous down tube shifting systems.Cite error: Closing </ref> missing for <ref> tag This is done because the chain is shifted across the cassette much more often than the chainrings. This setup might save up to 200 grams (7.1 oz) of the total bike weight. Compared to the minimum legal racing weight permitted by the Union Cycliste Internationale, 6.8 kilograms (15 lb), 200 grams is about 3% of the total weight.
See also
References
Andrews, Guy (2008-05-01). Road Bike Maintenance. Globe Pequot. ISBN 9780762747467. https://books.google.com/books?id=DCK9XOsw5E4C&dq=%22Shimano+Total+Integration%22&pg=PT127.
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