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Box's Prime 9 Technology is a counter-intuitive philosophy based on the less is more theory. It embraces range without adding complexity. The outcome is fewer parts, reduced weight, and increased durability. Single shift option is recommended for eBike use. Prime 9 technology offers the same range as a 12-speed drivetrain, with fewer gears to shift through. Fewer parts, reduced weight, and increased durability. Prime 9 drivetrains significantly reduce the chain angle in the lowest gears, allowing the chain to run straighter across all gears, increasing the life of the chain and cassette. The 2-piece multi-shift pull lever allows for riders to move up to 3 gears per shift. The Prime 9 chain is compatible with modern narrow/wide chainrings, and resists stretching over time, and decreases wear on the cassette and chainring.
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