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What headset does a Cannondale SuperSix EVO 4 (2021 on) use?

The headset fitment standard on a Cannondale SuperSix EVO 4 (2021 on), and how to pick the right part.

DROPS IN
A Cannondale SuperSix EVO 4 (2021 on) uses a IS42 integrated upper headset (integrated, 42 mm).
This frame's fitment
FrameCannondale SuperSix EVO 4 (2021 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 Cannondale SuperSix EVO 4 uses an integrated IS42 upper headset, a 27.2 mm seatpost, a 12x100 front thru-axle and a braze-on front derailleur.

The 27.2 mm post is the class default for this disc-road frame. The bottom bracket returned to BSA threaded on the 4th-gen SuperSix, covered on its own page.

The part to buy
Search Amazon for IS42 for your Cannondale SuperSix EVO 4 (2021 on)affiliate searchFind IS42 for your Cannondale SuperSix EVO 4 (2021 on) on eBayaffiliate
Related fitment pages
IS42integrated, 42 mmBottom bracket for Cannondale SuperSix EVO 4 (2021 on)same frame, BB shellSeatpost diameter on a Cannondale SuperSix EVO 4 (2021 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