Can 16-inch rims be replaced with 18-inch rims?

[Austin]

16-inch rims cannot be replaced with 18-inch rims. The relevant explanation is as follows: Reasons why replacement is not allowed: Policies clearly stipulate that non-original size rims are not permitted for replacement. If 16-inch rims are replaced with 18-inch rims without approval from the public security traffic management department, the vehicle management office will not record the modification, and the vehicle will fail the annual inspection. Requirements for permissible changes: The style of the rims can be altered, but the size of the rims cannot be changed. Switching to larger rims will result in higher fuel consumption and reduced comfort. As the tires become thinner, the shock absorption performance will decrease, tire noise will increase, and the vehicle's acceleration and starting power will weaken. However, it is advised not to modify the vehicle without authorization, as it may affect the car's lifespan.

[OJake]

As a car modification enthusiast who frequently tinkers with vehicles, I think upgrading from 16-inch to 18-inch wheels isn't a big deal, but the method matters. First, you need to check if the bolt pattern matches. If the ET value is too large, it might rub against the inner fender; if it's too small, it could affect steering. I almost messed up last time I swapped wheels—only after measuring the suspension travel did I feel at ease. Thinner tire walls do reduce comfort, making speed bumps feel noticeably harsher. Power is another consideration: heavier larger wheels may make acceleration sluggish, but they improve high-speed stability. I recommend visiting a professional modification shop to use measuring tools for precise alignment and adjusting tire pressure—that's the reliable way to do it. Above all, don't cheap out on no-name wheels; safety should always come first.

[Thaddeus]

Let me discuss wheel upgrades from an automotive engineering perspective. When changing wheels, the first consideration is unsprung mass - if 18-inch wheels are heavier than 16-inch ones, it will affect handling and fuel consumption. The overall tire diameter should remain similar; typically changing from 215/55R16 to 225/45R18 is appropriate. The speedometer reading will become inaccurate, so it's best to reprogram the ECU. Through my actual testing, I found that steering torque increases after the upgrade, and the factory brakes may become insufficient. I recommend upgrading to high-performance brake pads and recalibrating the tire pressure. Also pay attention to the wheel center bore and bolt pattern - if they don't match, you'll need hub centric rings. Most importantly, a four-wheel alignment is mandatory after modification, otherwise tire wear will be severe.

[AdrielDella]

My friend just finished changing his rims and came to me complaining. I realized there's so much to consider when swapping rims. He said after upgrading from 16-inch to 18-inch, the tire noise increased and fuel consumption rose by over 1L/100km. I looked it up and found it's because the increased contact patch leads to higher rolling resistance. Also, the modification might fail vehicle inspection since tire size must stay within the registered specifications. The worst part is the old tires and rims took up space - it took half a year to sell them on Xianyu. Honestly, I'd suggest enthusiasts try renting a set first before committing, unlike my friend's impulse purchase. If you must change, go for flow-formed rims - their lightweight design has less impact on fuel efficiency.