The top half of Cane Creek's Hellbender 70 ViscoSet headset: a ZeroStack upper built around interleaved, fluorocarbon-coated damping plates that resist the high-frequency steering oscillation riders call speed wobble, sold on its own as a ZS44/28.6 top. Half the plates lock to the cup and half move with the steerer, so relative movement between them is damped rather than left to amplify.

How the damping works

The headset ships with a mid-range damping setting. Riders can run it with more or less damping by changing the orientation of the internal plates during a normal headset service — no proprietary tools needed.

Compatibility & fit

S.H.I.S. ZS44/28.6: 13.5mm stack height, for 1-1/8in ZeroStack head tubes running a 1-1/8in steerer. This ZS44 top fitment suits head tubes machined for a ZeroStack cup; Cane Creek also offers an EC34/28.6 top for traditional head tubes, both pairing with the same Hellbender 70 ViscoSet ZS56/40 bottom. If you're not sure which your frame needs, the Tune workshop can check and fit it.

Cane Creek's Hellbender 70 headsets carry a 2-year warranty to the original owner against defects in materials and workmanship. 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, so keep your proof of purchase.
  • S.H.I.S. ZS44/28.6 top, 13.5mm stack height
  • Interleaved ViscoSet damping plates calm speed wobble
  • Field-adjustable damping, no special tools
  • 7075-T6 aluminium cup, sealed stainless steel Hellbender bearing
  • Mid-tune damping preset as shipped, 99g
S.H.I.S. (upper)ZS44/28.6
Top typeZeroStack (ZS)
Stack height13.5mm
Bearing typeSealed stainless steel (Hellbender)
Material7075-T6 aluminium
Weight99g
Damping presetMid-tune, field-adjustable
FunctionViscoSet steering damping (anti speed-wobble)
SKU DTW-CKG-HST70VSZSS8K
Barcode # 840226079790
Brand Cane Creek
Shipping Weight 0.1990kg