The bottom half of a Cane Creek 40-Series headset — zerostack and crown race that seats at the bottom of the head tube and carries the fork's lower bearing. This is a less common, irregular size — measure your head tube bore before ordering.

Highlights

  • S.H.I.S. code ZS55/40 — ZeroStack, 55mm cup, 40mm crown race seat
  • For a 1.5in steerer
  • Sealed cartridge bearing, black oxide
  • Black finish

What the code means

Cane Creek's S.H.I.S. (Standardized Headset Identification System) code states a headset cup's real dimensions rather than a marketing name, so two cups with the same code always fit the same head tube and steerer. The code reads as the cup type and outside diameter, then the crown race seat diameter — e.g. ZS55/40 is ZeroStack, 55mm cup, 40mm crown race seat.

Compatibility & fit

Matches a 55mm zerostack lower head tube and a 1.5in steerer only — a bottom assembly for the wrong S.H.I.S. code won't seat. Confirm your frame's lower head tube bore and steerer diameter against Cane Creek's fit chart, or ask the Tune workshop to measure and fit it.

Cane Creek covers 40-Series headset parts for 1 year against defects in materials and workmanship, not everyday wear or incorrect installation. For warranty support, return the product to Tune Cycles and we'll manage the claim with Cane Creek's Australian distributor. This is in addition to your rights under the Australian Consumer Law — keep your proof of purchase.
ZeroStack, 55mm head tube bore, 39.79mm crown race seat (1.5in steerer), Sealed cartridge bearing, black oxide, Black finish
BrandCane Creek
Series40-Series
S.H.I.S. codeZS55/40
Cup typeZeroStack
Steerer1.5in
BearingSealed cartridge bearing, black oxide
ColourBlack
Material6061 aluminium cups
Crown raceSteel, face-sealed
SKU DTW-CKG-HSB40ZS5-55
Barcode # 840226077642
Brand Cane Creek
Shipping Weight 0.1000kg

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