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Erickson Gizzmo ®
From WikiPedalia
Early models of Shimano 's STI brifters were only designed for use with double chainwheels. The Erickson Gizzmo was an aftermarket cam device that permitted a double type front STI shifter to work with a triple crank. The normal position had the lever facing down, and the STI brifter worked as a normal double, using the middle and large chainring. When you flipped the lever up, the cam moved and gave extra slack to the cable, permitting access to the granny gear .
