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Depends if you are planning on upgrading or already have 17 inch or 20 inch rims. But regardless of this youâ€™ll still run into a slight problem with your speedo calibration as the extensa HPâ€™s lowest profile on offer 225/45 R17 will have an overall diameter of 635mm. The Piazza standard diameter range should be 589.6mm, white the Irmscher and the â€˜87 RS spec Impulse have a tyre diameter of 601.6mm. So in other words anywhere within that range will be fine if you want your speedometer to maintain its accuracy. Iâ€™m afraid 635mm will have a significant effect on your speedo calibration.