Gilles ACMA steering stem nut for Kawasaki ZX-4R 400, black⟲ 360° — drag me
02 · Data & docs

The facts.

Technical data
BrandGilles Tooling
SeriesACMA
Part numberACMA-28-10.b (black), ACMA-28-10.bl (blue), ACMA-28-10.r (red)
TypeSteering stem nut for the top yoke
ThreadM28 x 1.0
MaterialAluminium 7075, anodised
LockingPatented pin-interlock anti-twist lock
UseSteering head only, not for wheel or swingarm axles
FitmentKawasaki ZX-4R 400 (2023–2025)
Road approvalNot required (Gilles)
DescriptionThe whole story▼

A 399 cc four-cylinder that spins far beyond ordinary road-bike revs has made the ZX-4R the small bike that sounds like a big one. Its cockpit is compact, and the steering stem nut sits exactly where the eyes land when the bike is parked. The Gilles ACMA replaces it with a milled, anodised aluminium part.

Key Features

  • M28 x 1.0 thread
  • Not for rear wheel or swingarm axles (Gilles)
  • Aluminium 7075, anodised
  • Patented pin-interlock anti-twist lock, taken over from the ACM axle nut
  • Colours: black, blue or red
  • No registration required, according to Gilles

Photographed on this bike

Gilles shot the black ACMA on a ZX-4R, so the picture shows how it looks on your model. It is listed for type ZX400P from 2023, and it keeps the pin-interlock lock that Gilles developed for its titanium axle nut.

Road Approval

According to Gilles, the ACMA steering stem nut needs no approval on the Kawasaki ZX-4R 400. Nothing changes in the papers; tighten it to the manufacturer's value for the steering stem nut.

Scope of Delivery

One ACMA-28-10 steering stem nut in your chosen colour.

Fitting

The ACMA replaces the nut on the top yoke. Tighten it to the torque the motorcycle manufacturer specifies for the steering stem nut and check the steering for free movement afterwards. If you are unsure, let a workshop do it.

Specifications

  • Brand: Gilles Tooling
  • Series: ACMA
  • Part number: ACMA-28-10.b (black), ACMA-28-10.bl (blue), ACMA-28-10.r (red)
  • Type: Steering stem nut for the top yoke
  • Thread: M28 x 1.0
  • Material: Aluminium 7075, anodised
  • Locking: Patented pin-interlock anti-twist lock
  • Use: Steering head only, not for wheel or swingarm axles
  • Fitment: Kawasaki ZX-4R 400 (2023–2025)
  • Road approval: Not required (Gilles)
What's includedEverything in the box▼
  • 1x Gilles ACMA steering stem nut M28 x 1.0 (colour as selected)
FitmentWhich bikes this fits▼
  • Kawasaki ZX-4R 400 (2023–2025)
07 · Support

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