Fire Eye's 42T expander sprocket is the ideal addition for those converting to a 1x10 drivetrain, or if you find your 2x10 drivetrain still leaves you struggling on those extended climbs. Fully CNC machined from 7075-T6 aluminium, this expander provides excellent durability at a low weight. It also comes with a 16T steel sprocket, which helps to smooth the transition through the cassette.
Steel 16T sprocket included / Chrome plated steel (16t )
Weight: 85.5g (42T)
FireEye 42 tooth sprocket to mount 1x10 speeds on your mountain bike. Put this 42T sprocket back and remove the front small chainring, the derailleur and the shifter. Got simplicity, reliability and lightness. Select Shimano or SRAM.