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 Fender Bridge Rear Mudguard 2023
GIANT DEFY ADVANCED &TCR ADVANCED HEADSET BEARINGS
Giant Trinity Front Stem Spacer 30mm
Mech Derailleur Hanger to fit Giant #380000016 Anyroad Avail Defy Langma Propel
GIANT Avail TCR OCR DEFY FCR TCX Rear Derailleur Gear Mech Hanger Dropout CC012
Giant Workstand Adapter Kit - ISP Aero Round D-Fuse 30.9/27.2mm TCR Propel Defy
