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Using an advanced structural design, the Race XXX Lite ATB crankset achieves an incredibly optimized strength-toweight ratio. The ultimate drivetrain upgrade for your high performance ATB bike. The Bontrager Race XXX Lite ATB crankset is loaded with features: • True hollow-molded carbon structure keeps the weight to an absolute minimum. • Splined ISIS bottom bracket assembly redefines smooth and efficient pedaling. Please read this instruction manual Figure 1- Bontrager Reace XXX Lite carbon fib