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Message: <blockquote data-quote="turbology" data-source="post: 267986" data-attributes="member: 10223">If you were using 195/55-15 , and you increase width to 205, you might have to drop your sidewall ratio to 50. Yes, the second number is a RATIO. Not height, not size.Is not up to you to choose "60 or 55".You need to keep the same diameter(or rotation),  or as close as you can.Read up. <a href="http://www.ama-cycle.org/roadride/tires.asp" target="_blank">http://www.ama-cycle.org/roadride/tires.asp</a>Choosing wrong tires will messep up your speedometer since the rotation per minute at certain KM/H is no longer the same.Different diameter will also affect your gear ratio, which could affect your power, and fuel mileage.Smaller sidewall ratio always result in stiffer ride, since the room for "boucing" is less.But stiffer sidewall will give you better respone when you change rotational direction (switching lane at high speed for example)Another thing, changing tires from 195 to 205 DO NOT increase your contact patch.Which mean, the surface area between tires and road remain the same! Which theorically, do not increase your "grip"</blockquote>