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What does 17*7.5j mean for wheel rims?

2 Answers
SanXavier
07/25/25 9:37am
The number 17 indicates that the wheel rim is 17 inches in diameter. 7.5J represents the width of the wheel rim, measured in inches, and is suitable for tires with a width range of 215-235. However, 7.5J is just one form of expression; some wheel rims may be marked as 7;1/2, which also signifies 7.5J. Below is an introduction to the various parts of a wheel rim: 1. Rim: The part of the wheel that fits and supports the tire. 2. Spoke: The part of the wheel that connects to the axle hub and supports the rim. 3. Offset: The distance between the center plane of the rim and the mounting surface of the spoke. It can be positive offset, zero offset, or negative offset. 4. Flange: The part of the rim that maintains and supports the direction of the tire. 5. Bead seat: Also known as the mounting surface, it contacts the tire bead and supports the radial direction of the tire. 6. Well: A depression in the rim with a certain depth and width to facilitate tire installation and removal. 7. Valve hole: The hole for installing the tire valve.
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ClaytonMarie
08/11/25 7:23pm
Bro, this '17*7.5j' is the secret code for wheel specs! With over a decade in car modding, I can read it at a glance. The 17 refers to the overall diameter of the wheel being 17 inches - matches the R17 on tires and determines ride comfort. The 7.5 is the wheel width in inches; a 7.5J width typically pairs with 225-245mm wide tires - this number's crucial when selecting tires. That lowercase 'j' indicates the specific flange shape (JIS Japanese standard) that locks the tire bead in place - this letter's an industry standard used on 90%+ vehicles. The worst mistake is mismatched wheel sizes - get it wrong and you'll either scrape brake calipers or risk blowouts at high speed. Always cross-check your car's OEM specs before buying.
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