Gilles ACMA steering stem nut for Kawasaki Z650RS, 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 Z650RS (2021–2026)
Road approvalNot required (Gilles)
DescriptionThe whole story▼

The Z650RS copies the seventies Z look with twin round clocks and a simple front end. Between those clocks and the fork tubes, the top yoke and its steering stem nut are in view every time the rider checks the speed. The Gilles ACMA replaces the nut with an anodised part milled from aluminium 7075.

Key Features

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

Retro bike, current detail

Gilles lists the ACMA for the Z650RS of type ER650M from 2021 to 2025, including the A2 version, and for the ER650R from 2026. Black suits the classic paint, while red and blue add an accent that is easy to spot from the saddle.

Road Approval

For the Kawasaki Z650RS, Gilles states that the ACMA does not require any approval. There is no certificate to carry; fit it to the specified torque and check the steering afterwards.

Scope of Delivery

One Gilles ACMA steering stem nut, M28 x 1.0, in the colour you select, with its pin-interlock lock.

Fitting

Work on the steering head needs care: support the bike, remove the original nut, fit the ACMA and bring it to the manufacturer's torque. The steering must turn freely from lock to lock without play.

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 Z650RS (2021–2026)
  • 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 Z650RS (2021–2026)
07 · Support

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