Replacement Headset bearings to fit Giant OD Mountain Bike headsets Not Giant OD2 Mountain bike Headset Compatible with all 2015 - 2018 models Replaces Original GCR15 high carbon chromium bearings steel is standard material for precision C3 bearings H62 copper sheet or 08F cold rolled steel belt. NitrileRust Resistance under normal operating conditions for six months then relube if necessary. Bearings are supplied with low noise bearing grease thickened by lithium and calcium 12 - hydroxystearate,, made from deeply refined mineral oil with rust inhibitors and anti oxidants.
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