What does the J value of a tire mean?
2 Answers
J value represents the shape and height of the wheel hub flange, and the J value of the tire is the width of the wheel hub. Additional information is as follows: 1. Aspect ratio: It is the ratio of the section height to the section width. Simply put, the smaller the value, the thinner the tread, and the stronger the feedback from the road surface, but the comfort is reduced; the larger the value, the thicker the tread, the worse the road feel, but the better the comfort, and the weaker the lateral resistance when turning. 2. Load index: It represents the maximum weight that the tire can bear. If the tire load index is 91, referring to the table, the corresponding load index is over 600 KG. Multiply this by four wheels, and the vehicle's load capacity is approximately 2.4 tons.
I've been driving for many years and have helped friends modify rims. The J value is the width marking of the rim, measured in inches, such as 6.0J or 7.5J, where the number indicates the width dimension of the rim. The J represents the design shape of the rim edge, specifically a hook edge structure, which ensures the tire is securely fastened and less prone to air leakage. If the J value is incorrect, the tire may not be installed firmly, leading to shaking at high speeds or rapid wear, affecting driving safety. In this regard, I would advise car owners to check their vehicle manual when selecting rims to match the tire specifications, such as the width value of 195/65 R15, to avoid modification errors. The rim J value also relates to fuel consumption; a width that's too large increases friction and reduces fuel economy. Once, I mistakenly used a rim with a wide J value, which caused abnormal tire wear and cost me a lot to replace, a lesson learned the hard way. So, it's best to choose the right one from the start.
