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17 inch space saver tyre12/25/2023 ![]() ![]() Drivers should check their spare when they inspect their other tyres What about legality?Įven if a tyre is a spare, it must still have at least 1.6mm of tread on it. The 0.4% difference between our reader’s wheel/tyres should present no problem at all. The tyre industry permits a difference of 2.5 and 3% between the existing wheel/tyre combination and spare. The difference between the reader’s existing and proposed emergency spare tyre is less than half a per cent. ![]() But depending on the tread levels and type of tyre there may be differing amounts of grip between the spare and the other three tyres. ![]() You’re unlikely to feel that when you’re driving the car. The difference in rolling radius between the two sizes of wheel is 1.3mm. That makes the radius of the 15” wheel 317.25mm the radius of the 16” wheel 315.95mm. The total diameter of the 16” wheel plus tyre is 631.9mm. Some quick maths shows us that the total diameter of the 15” wheel plus tyre is 634.5mm. And the aspect ratio of 55% tells us the side wall is 112.75mm.Ĭounter intuitively, the larger 16” wheel actually has a smaller total diameter and therefore radius than the smaller 15” wheel. Meanwhile the 205/55 R16 has a tread width of 205mm. The aspect ratio (65%) tells us the sidewall is 126.75mm. The 195/65 R15 tyre has a tread width of 195mm. But let’s look at the different overall sizes between the two types of wheel our reader is suggesting using. For example the Ford hot rod in our main picture. Some cars can get away with radically different tyre and wheel sizes between axle. Won’t a smaller wheel upset a car’s balance? When it’s mounted on the car, the smaller wheel might feel slightly different to having four identically sized wheels and tyres. If you’re using a regular tyre, we’d suggest you adopt a similar tactic. This is because they have less grip than regular tyres. However, tyre makers/retailers suggest drivers use them for no more than 50 miles. Space saver spares are only designed to travel at 50mph but they aren’t restricted to any specific distance. For emergencies, using a smaller wheel to get you home or to a tyre repairer is fine. If you think about it, space saver spare wheels frequently have a smaller diameter than regular wheels. But he wants to know if he can still use one of the car’s original wheels as an emergency spare. He then changed the steel wheels for 205/55 R16 alloys. To learn more about how and for what purposes Amazon uses personal information (such as Amazon Store order history), please visit our Privacy Notice.Our reader bought his car second hand with 195/65 R15 steel wheels. You can change your choices at any time by visiting Cookie Preferences, as described in the Cookie Notice. Click ‘Customise Cookies’ to decline these cookies, make more detailed choices, or learn more. Third parties use cookies for their purposes of displaying and measuring personalised ads, generating audience insights, and developing and improving products. This includes using first- and third-party cookies, which store or access standard device information such as a unique identifier. If you agree, we’ll also use cookies to complement your shopping experience across the Amazon stores as described in our Cookie Notice. We also use these cookies to understand how customers use our services (for example, by measuring site visits) so we can make improvements. We use cookies and similar tools that are necessary to enable you to make purchases, to enhance your shopping experiences and to provide our services, as detailed in our Cookie Notice. ![]()
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