It’s has a 1”1/8 top lower is wider 33mm. To be used with inter grated headset bearings. Upper Bearing - MR136. Info online says you need bearings.
GIANT DEFY road bike.
Fork Giant Defy Advanced Carbon Disc 250mm Steerer Tapered Black (New Take-off)
Giant Defy 4 Road Bike
Unisex Giant Defy 16s 2012 Aluminium White & Red Road Bike - Serviced - 56cm/L
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SHBNGGD Comfortable Bike Seat Compatible for Giant Defy Advanced 2010 2014 2017 2018 2019 2020, Bicycle Saddle Shock-Absorption Bike Saddle Bicycle Seat for Mountain and Road
