Promax Direct Mount 42t Chainring Black Model=Combo Mini U-Lock Hollow-forged from 6061-T6 aluminum both

Hollow-forged from 6061-T6 aluminum both crank arms are hollow so they are super stiff yet lightweight

Connectivity ANT+ BT SMART Customizable Screen Yes Watch Color Whitestone Battery Type Lithium Ion Touchscreen Yes External Sensor Compatibility Speed/Cadence/HR Primary Color White GPS Yes Solar Charging Yes Heart Rate Monitor Yes Wristband Whitestone - Silicone

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Promax Direct Mount 42t Chainring Black Model=Combo Mini U-Lock Hollow-forged from 6061-T6 aluminum bothPromax Direct Mount 42t Chainring Black. Machined from high end aluminum Promax Direct Mount chainrings are made to be lightweight yet extremely durable to handle the torque and stress of modern BMX racing and other single ring applications. Uses SRAM 3 bolt direct mount chainring to crank interface Provides a lighter set up by elimating the use of a spider while remaining strong and stiff CNC Machined from high grade 6061 T6 series aluminum for high