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What headset does a Giant TCR Advanced (2020 on) use?

The headset fitment standard on a Giant TCR Advanced (2020 on), and how to pick the right part.

DROPS IN
A Giant TCR Advanced (2020 on) uses a IS42 integrated upper headset (integrated, 42 mm).
This frame's fitment
FrameGiant TCR Advanced (2020 on)
Headset standardIS42 (integrated, 42 mm)
Cup / bearing outside diameter41.8 to 42.0 mm bearing outside diameter
Steerer diameter28.6 mm (1 1/8 in)

The Giant TCR Advanced uses an integrated IS42 upper headset, a 27.2 mm class seatpost, a 12x100 front thru-axle and a braze-on front derailleur.

Some Giant frames use a proprietary D-shaped post; confirm the exact part. The bottom bracket is a BB86 press-fit shell, covered on its own page.

The part to buy
Search Amazon for IS42 for your Giant TCR Advanced (2020 on)affiliate searchFind IS42 for your Giant TCR Advanced (2020 on) on eBayaffiliate
Related fitment pages
IS42integrated, 42 mmBottom bracket for Giant TCR Advanced (2020 on)same frame, BB shellSeatpost diameter on a Giant TCR Advanced (2020 on)same frameIS42 on a Trek Emonda SLR (2024 on)same standard, another frame

SOURCES: Park Tool, Standardized Headset Identification System (SHIS) · BikeGremlin, Bicycle headset bearing standards (SHIS) · BikeRadar, Road bike axle standards: the complete guide