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Blackspire e bike chainringthis chainring has been designed and engineered to offer exceptional shifting performance when used onboard an e bike drivetrain'. '.strtoupper('t')he shift pins have been strategically placed to guarantee consistent shifting in any circumstance'. '.strtoupper('e')ffortless and crisp shifting performancewhether being driven by the motor or the rider, these chainrings are intended to perform to an exceptional level'. '.strtoupper('t')he outer and middle rings have been specifically designed to feature custom engineered shift ramps that provide accurate, effortless and crisp shifting performance.increased durabilitydue to the high forces an e bike motor creates and applies to drivetrain components, a standard cycling chainring is not an ideal option'. '.strtoupper('w')ith durability in mind this chainring has been made from 7075 aluminium and tempered t6 to increase its durability'. '.strtoupper('b')lackspire has selected high quality stainless steel when creating the shift pins to guarantee smooth and accurate shifting performance, especially when under load from the e bike motor.featuresmaterial 7075 t6 aluminiumouter and inner ring thickness 4.06mmmiddle ring thickness 4.83mmfinish anodiseddrivetrain speed 9, 10, 11speedcompatibility 104mm and 64mm b.c.d'. '.strtoupper('c')ranksplease notethe 104 38t  104 40t chainrings are designed for 2x drivetrainsto shift correctly the 104 38t requires the use of a 64 24t or 64 26t inner ring to shift correctly the 104 40t requires the use of a 64 26t or 64 28t inner ringbuy blackspire components from chain reaction cycles, the world's largest online bike store.