Skylarking
Well-Known Member
- Joined
- Feb 3, 2018
- Messages
- 10,113
- Reaction score
- 10,561
- Points
- 113
- Age
- 123
- Location
- Downunder
- Members Ride
- Commodore Motorsport Edition
Its states in the “significant modification requiring certification“ section at the end of the document.Good point; while the diameter of the wheel itself in NSW has been "anything goes" since at least the 80's, the overall tyre rolling-diameter wasn't previously allowed to vary by more/less than a number which I've forgotten.
You could be right, they may have rolled that up into "speedometer accuracy".
For information on when a compliance certificate is required (for example fitting replacement tyres that increase or decrease tyre diameter by more than 7% of the overall original tyre diameter), see VSI No.6 ‘Light vehicle modifications’, or Vehicle Standard Bulletin (VSB) No. 14 ‘National Code of Practice for Light Vehicle Construction and Modification’.