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Advantages and disadvantages [edit] An electronic system can have several advantages over a comparable mechanical system: eliminate the need for the rider to switch hand positions in order to shift [1] allow for an accurate and effortless shift, even in difficult circumstances, such as if the rider has cold hands or is completely exhausted shifting performance is not affected by contaminated, stretched, or worn Bowden cables automatic trim function can eliminate chain rub [1] shifts can be timed to occur at a particular point in the cassette or chainring rotation, making best and smoothest use of ramps and cutouts in the sprocket teeth the front and rear shift pattern on a bike with multiple chainrings can be programmed to make best use of the gear progression, avoid duplicate ratios and relieve the rider of the need to decide what combination of front and rear sprockets to employ the smoothness of electronics can reduce the shock on drivetrain components [5] An electronic system may have some disadvantages when compared to a mechanical system: There is currently no option for manual override when the battery is exhausted

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