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I see threads coming up all the time with guys changing wheel size and wondering what tyre size to go for. I'm a big fan of trying to keep as close to the standard rolling radius where possible as it keeps the speedo correct and won't harm the acceleration too much. Also wear and tear on components needs to be considered too. So I have started compiling a list of tyre sizes that will be suitable for your car depending on the mk of Polo you have and also the wheel size you want to run. All sizes are based around a standard size +/- 2%. Mk1-3 (86/86c) - Standard rolling radius based on 175/60/13 = 540mm 13" wheels 155/70/13 165/65/13 175/60/13 185/55/13 14" wheels 165/55/14 175/50/14 185/50/14 195/45/14 15" wheels 165/50/15 Mk4-5 (6n/6n2) - Standard rolling radius based on 185/55/14 = 559mm 13" wheels 175/65/13 185/60/13 14" wheels 175/60/14 185/55/14 15" wheels 175/50/15 185/50/15 185/45/15 195/45/15 205/45/15 16" wheels 195/40/16 205/40/16 215/35/16 Mk6-7 (9n/9n3) - Standard rolling radius based on 165/65/14 = 570mm (Note 9n3 GTI is different) 14" wheels 165/65/14 175/60/14 185/60/14 15" wheels 175/55/15 185/50/15 195/50/15 205/45/15 16" wheels 175/50/16 195/45/16 205/40/16 215/40/16 This is as far as I have gotten just now, at the time of looking into this all above tyres sizes were all available to buy. This site was very useful in comparing the sizes http://www.tyresave.co.uk/tyresize.html If anyone has any tyre size suggestions that keep within the 2% of standard rolling radius rule then please post them up and I'll add them to the list. Please Note: Tyres are the one and only thing that hold your car to the road. If you spend money in just one area of your car, spend it on tyres. Decent tyres alone will reduce stopping distances and improve handling, overall increasing the safety of your car. I would highly recommend you do your own research before going out to buy the cheapest 155 section tyre available to put on your 7" rim because you want stretch on a budget. Or just buying budget tyres in general. Final Note: This is a guide only!! Factors like wheel width, offset, ride height etc. all need to be considered. Another useful website for comparing tyre size differences along with changes in wheel size, width and offset is www.willtheyfit.com