What size is a 225 55R18 tire in inches?
Therefore, the tire size 225/55r18 can be expressed in inches as roughly 8. On the sidewall of your tire, you will notice a sequence of markings that looks like 205/55/r18. This sequence refers to the tire’s width (205mm), height (55 – in percentage form), type (r-radial), and diameter in inches (18).This number refers to the section width of the tire, measured in millimeters from sidewall to sidewall; thus, a 255 tire is 10mm wider than a 245 tire. This is the aspect ratio; the sidewall height of the tire as a percentage of its width.
Can I use 245 tires instead of 225?
Yes, 225 and 245 tires can often be interchanged, but it is not a direct plug-and-play swap. Whether it is safe or advisable depends on two main factors: your rim width and your clearance. If your wheel is too narrow for a 245 tire, the sidewalls will balloon out, causing sloppy handling. A 235 tire is slightly wider and has a larger overall diameter than a 225 tire. This difference seems small, sure! But it can change how your car feels on the road. Wider tires improve grip.