Darrellll Posted August 29 Share Posted August 29 I own a 2021 Range Rover Evoque vehicle, namely the P300e SE RD variant. I now have 235/50 R20 tires and I want to switch to 245/30 R20 tires. My issue is whether or not I can use these tires. If I am able to, I must purchase wheels. Therefore, I would want to know the appropriate size of tires for these wheels. Quote Link to comment Share on other sites More sharing options...
MrGreedy Posted August 29 Share Posted August 29 To maintain the accuracy of the speedometer, you must first determine the desired wheel size and then choose the appropriate tires that have the same aspect ratio and rolling diameter. Below is a reliable website for doing comparisons: https://www.oponeo.co.uk/tools/tyre-size-calculator/235-50-r20 Quote Link to comment Share on other sites More sharing options...
Darrellll Posted August 29 Author Share Posted August 29 I already mentioned my preference for using tires with the specifications of 245/30 R20. However, I must admit that I had some difficulty in comprehending the information provided on the page. Quote Link to comment Share on other sites More sharing options...
Trevorseaf Posted August 29 Share Posted August 29 If you want to install a tire that is 10mm wider while simultaneously reducing the sidewall by 20%, it is important to note that this adjustment is excessive. It will result in a smaller circle, which will therefore damage the accuracy of your speedometer. The circumference calculator recommends reducing the aspect ratio to 45% in order to get a comparable size of around 245/45x20. The numerals on the tire indicate specific measurements. The first number, 245, represents the width of the tire in millimetres. The second number, 45, indicates the sidewall height as a percentage of the tire width, not in millimetres. Therefore, it is 45% of 245mm. Lastly, the number 20 simply refers to the diameter of the wheel. Increasing the width of your tire by 10mm results in a 5% reduction in the sidewall ratio in order to maintain a similar circumference. The result of calculating 50% of 235mm is 117mm. The result of calculating 45% of 245mm is 110mm. The result of calculating 30% of 245mm is 73mm. The disparity between 117mm and 73mm amounts to 44mm, which is about equivalent to 2 inches in the imperial measurement system. Although it may seem visually appealing and I myself like narrower tyre sidewalls, it will significantly affect the accuracy of your speedometer. Quote Link to comment Share on other sites More sharing options...
alpaco45 Posted August 29 Share Posted August 29 If you have a strong desire to use a tire with a reduced sidewall height (which might potentially impact the smoothness of the ride), you will need to either adjust the Speedometer or choose for a bigger wheel. Quote Link to comment Share on other sites More sharing options...
guyskin Posted August 29 Share Posted August 29 The size difference is very large. Quote Link to comment Share on other sites More sharing options...
guyskin Posted August 29 Share Posted August 29 https://www.tacomaworld.com/tirecalc?tires=235-50r20-245-30r20 Quote Link to comment Share on other sites More sharing options...
Darrellll Posted August 29 Author Share Posted August 29 What is the maximum tyre size and width that I may use? Quote Link to comment Share on other sites More sharing options...
Trevorseaf Posted August 29 Share Posted August 29 The tire size calculator indicates that a tire size of 245/45 provides the diameter closest to your previous tire size of 235/50. Quote Link to comment Share on other sites More sharing options...
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