STI stands for System Total Integration. Produced by Shimano, STI is a bicycle hand-operated control that combines the functions of braking and shifting. A bicycle uses two of these controls, which are mounted independently on either side of the bicycle handlebar. The left control handles braking and shifting duties for the front of the bike; the right control manages the same functions for the rear of the bike. Because each STI control uses a bracket to mount onto the handlebar, the handlebar must be free of any grip tape before installation.
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Things you need
- 5mm hex key
Choose either Shimano STI control to install onto the handlebar first. The two controls are not identical. Each control's shift paddles are designed to move in toward the bicycle. The right control's paddles pivot to the left; the left control's paddles pivot to the right.
Peel back the rubber cover atop the Shimano STI control. There is a 5mm hex bolt just below the cover.
Use a 5mm hex key and loosen the bolt, which will widen the mounting bracket on the base of the control. Loosen the bolt just enough to allow the mounting bracket to slide onto the end of the bicycle handlebar.
Slide the Shimano STI control mounting bracket onto the handlebar until the control is positioned near the top bend of the handlebar. The control should also be straight and not angle in toward or away from the bicycle.
Adjust the height of the Shimano STI control as needed. The ideal height is subjective, but the shift and brake levers should always be comfortable to reach. Use the 5mm hex key to tighten the mounting bracket bolt once the control lever is positioned to your liking.
Repeat the installation steps for the second Shimano STI control and mount it onto the other end of the handlebar.
Position the second Shimano STI control at the identical height of the first control. One control should not be higher or lower than the other.
Tighten the bracket mounting bolt on the second control with the 5mm hex key.
Peel each shift lever cover back to its original position.
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