this post was submitted on 03 Oct 2024
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Just found this reddit post. A comment says:
I think 0.6mm isn't enough, but we can expand on that. A search shows a new tyre might have 8-9mm of tread. And legal minimum is 1.5mm, so that's 6.5mm or so difference, or about 10x the test above. Still, that would only make a difference of about 1km/h in the reading over the life of the tyre.
So seems 3km/h over is not explained by tyres. I guess F1 car tyres are smaller, but I'd think the impact would be smaller on larger tyres.
I thought you had to get the exact same sized tyres, because they had to fit the wheel.
Reddit seems to think it's calibrated to the factory installed wheels.
Thanks Google/Dave! - 0.6mm is a wild amount of wear but they are racing the shit of them...
Are you endlessly curious or something??
I did find this pdf from an nzta page that suggests there's a range of tire sizes available that a given wheel can accommodate (within their range of tolerance as well): https://www.lvvta.org.nz/documents/infosheets/LVVTA_Info_01-2009_V3_Tyre_Size_to_Wheel_Size_Compatibility_Guide.pdf
The 2nd page is a big honking table of different sizes, profiles and rim widths, so I gather there's a degree of anything goes and maybe next time we wear ours out, I'll try to be a little more attentive.. Maybe I can get some accurately sized ones (probably not worth it - getting pinged for going a few kmh over the speed limit would really suck!)