Enter your car or the size on your sidewall. You get the exact overall diameter, the speedometer error of every alternative, and the sizes that are genuinely safe to fit — calculated, not guessed.
The one question a language model gets confidently wrong. Here it is arithmetic: overall diameter difference, speedometer error at 100 km/h, and whether the load and speed ratings still qualify.
A tire 2% larger than stock makes your speedometer read about 2 km/h low at 100. Go far enough and the ABS, stability control and cruise control are all working from a wrong road speed. We show the exact figure for every size we suggest.
Vehicle manufacturers and roadworthiness inspections accept substitute sizes whose overall diameter stays within about 3% of the original. Every alternative on this site is filtered by that limit before you ever see it.
The 94W after the size is not decoration: 94 means 670 kg per tire, W means rated to 270 km/h. Fitting a lower rating than the manufacturer specified makes the car non-compliant, and cheap listings are full of them.