Parts for your 2020 Holden Commodore-Wheel studs nuts

2020 Holden Commodore wheel studs and nuts: are they used?

For the 2020 Holden Commodore (ZB series), wheel studs and nuts are not used. This model, built on the Opel/GM E2XX platform and manufactured in Germany, uses five threaded wheel bolts per wheel instead of fixed studs with separate nuts. This is confirmed across technical sources including the Holden ZB Commodore Owner’s Manual (Wheels and Tyres section), GM Service Information for the E2XX/Insignia platform (Wheel Fasteners), the Opel Insignia B Workshop Manual, and GM/ACDelco parts catalogues that list M14 x 1.5 wheel bolts rather than studs and nuts.

Why no studs and nuts? The ZB Commodore inherits European wheel-fastener practice. European designs commonly use hub-centric wheels located by the hub spigot and secured with wheel bolts. This suits GM/Opel manufacturing processes, keeps the hub face clean of protruding studs, and integrates neatly with brake package and bearing module design. Earlier Australian-built Commodores (e.g., VE/VF) did use studs and nuts, but the imported ZB switched to bolts in line with its Opel Insignia B origins.

What does this mean when servicing? While “wheel studs and nuts” don’t apply to the 2020 Holden Commodore, the same care principles apply to its wheel bolts:

• Use the correct bolt type and seat profile for the factory wheels (GM/Opel applications typically use a 60° cone seat). Mixing ball-seat and cone-seat hardware can cause loosening or damage.
• Tighten wheel bolts to the OEM-specified torque (commonly around 140 Nm for M14 x 1.5 on this platform). Always verify the exact value in the vehicle handbook or GM service information for the specific variant.
• Do not lubricate threads or seats unless the service manual explicitly instructs, torque values assume clean, dry threads.
• Inspect bolts for stretching, damaged threads, or corroded seats and replace in sets where required. Ensure the hub face is clean and the wheel sits flush.
• After tyre rotation or wheel service, recheck bolt torque after a short drive to account for any settling.

Owners considering “conversion studs” should note that aftermarket conversions alter the fastening system and may affect compliance, insurance, or WOF/roadworthy outcomes. Unless a properly engineered solution is specified for motorsport or special applications, retaining OEM wheel bolts is the sensible choice.

• Does the 2020 Holden Commodore have wheel studs and nuts?
  The 2020 ZB Commodore uses five M14 x 1.5 wheel bolts per wheel, not studs and nuts. This aligns with GM/Opel technical documentation for the Insignia/Commodore platform.
• What torque should be used on the wheel fasteners?
  Typical torque for the ZB Commodore’s M14 x 1.5 wheel bolts is around 140 Nm, but the exact figure should be confirmed in the Holden Owner’s Manual or GM service information for the specific model and wheel package.
• Can wheel studs and nuts be fitted instead?
  Aftermarket conversion studs exist but aren’t generally recommended for everyday road use. Any conversion should be engineered, checked for clearance and seat compatibility, and considered against roadworthy/WOF and insurance requirements.