What is the difference between 175r14 and 175/70r14?
2 Answers
175/70/14 tires have an outer diameter of 60.06 cm. Similar specifications for 185-width tires include 185/65/14, which is also for 14-inch tires, while 185/60/15 is for 15-inch rims. Both specifications have minimal deviation from the original tire's outer diameter. Below are detailed tire specifications: 1. 175/70R13: 175 represents the tire's section width in millimeters, which is the width of the tire in contact with the ground. 70 represents the aspect ratio, indicating the tire's height. R stands for radial tire. 13 denotes the tire size in inches. 2. 175/65R14: 175 represents the tire's section width in millimeters. 65 represents the aspect ratio. R stands for radial tire. 13 denotes the tire size in inches. 3. Difference: The aspect ratios of the two front tires differ, with 70 being slightly larger than 65, meaning the sidewall of the 70 is taller than that of the 65. A higher aspect ratio provides better vehicle comfort but relatively poorer handling. Conversely, a lower aspect ratio offers poorer comfort but better handling.
175r14 and 175/70r14 may look similar, but the key difference lies in that middle number 70. This figure is called the aspect ratio, representing the ratio of tire height to width. For example, 175/70r14 means the tire is 175mm wide with a height that's 70% of 175mm (i.e., 122mm). The notation 175r14 omits the aspect ratio, which by old convention defaults to 80, making the height 140mm. With such a significant height difference (18mm), the overall tire diameter can vary by 35mm. This might cause the tire to rub against the fender when installed, and even throw off the speedometer accuracy. I've seen cases where people bought wrong tires - they made chassis scraping noises during turns because the tires were hitting the wheel arches. Always check complete tire specifications when purchasing.
