The Rim will have a measurement mentioned - the nominal rim diameter. This should match the tire's rim diameter measurement. If you need ask any mechanic or tire shop for a clarification. Double check these numbers when you buy your tires.
Your tyre dimensions will be written like this - 185/65 R15. 185 is the tire width ( distance between the outside sidewalls). 65 is the aspect ratio (section height/width x 100) and 15 refers to the rim diameter. R means Radial Tires. Make sure the rim diameters and width match.
I've known instances when tires with a rating of 14 inches for diameter have been fixed on 13 inch rims without a problem. Not sure how safe this is though! This is done to avoid the cost of buying 5 new rims - but I wonder whether it is safe! posted by
boonjax (204)