Why Is There Sponge Inside Tires?

[McJustin]

The sponge inside tires is called "internal soundproofing foam," which helps reduce resonance noise generated during driving, with the most noticeable effect being the reduction of road noise. Here are some car tire maintenance methods: 1. Monthly tire pressure check: Under-inflation or over-inflation can lead to abnormal tire wear, shorten tire lifespan, increase fuel consumption, and even raise the risk of a blowout. Tire experts recommend checking tire pressure once a month to ensure it is at the correct level. The check must be done when the tires are cool, using a tire pressure gauge or a Tire Pressure Monitoring System (TPMS). The vehicle's manual will list the standard tire pressure for various load conditions. 2. Tire inspection: Regularly inspect the tread wear of the tires. If uneven wear is detected, check for cracks, cuts, bulges, or other damage on the tread and sidewalls, and promptly identify and address the cause. Also, observe the tire wear limit indicator, which is located within the tread pattern. If the wear is close to the limit, the tires should be replaced immediately. Regular tire rotation is also essential. Due to varying vehicle loads and road conditions, the four tires on a car wear unevenly. Therefore, after driving around ten thousand kilometers, it's important to rotate the tires. 3. Control driving speed: In cold winter months, if restarting after parking, since the tires are stiffer, it's necessary to drive at a lower speed for a while before resuming normal speed. Of course, the most crucial aspect of safe winter driving is controlling speed. Especially when driving on highways, pay attention to speed control, avoid sudden acceleration or braking, to ensure safety and effectively protect your vehicle and tires during the cold season, thereby avoiding traffic accidents.

[DelManuel]

I've been driving for over a decade and particularly care about tire noise during long trips. This sponge is professionally called sound-absorbing foam, which is a special material attached to the inner wall of the tire. When the tire rolls, the internal air creates resonant noise, especially noticeable at higher speeds. The foam absorbs these buzzing sounds, making the car much quieter—similar to how soundproofing foam works when applied to walls. Many new energy vehicles now use these quiet tires because without engine noise, tire noise becomes particularly noticeable. Additionally, it doesn't affect the tire's grip or heat dissipation performance. However, when repairing such tires, it's essential to find a professional technician, as regular tire repair shops might damage this material. This design is quite clever, ensuring both safety and improved comfort.

[VonAliyah]

Last time I went to the 4S shop for maintenance, the technician explained this design to me. When tires rotate at high speed, the vibration of internal air creates resonance noise, similar to the sound of blowing into an empty bottle. To solve this annoying noise issue, engineers adhered a layer of sound-absorbing foam to the inner side of the tire. This special material can effectively absorb sound wave energy, especially noticeable when driving at 120 km/h on highways. You'll notice that new energy vehicles particularly favor this design, as they don't have engine noise to mask tire noise. Moreover, this foam layer doesn't affect the tire's intended performance, though it does make repairs a bit more troublesome. Such detailed improvements truly enhance driving quality.

[FranciscoRose]

The sponge inside the tire is mainly for noise reduction. When a car is moving, the rolling of the tires causes the internal air to vibrate, creating a humming resonance noise. Engineers attach sound-absorbing materials to the inner sidewalls to dissipate this sound wave energy. This design is particularly relied upon by pure electric vehicles, as there is no engine noise to mask it. This special layer of sponge does not alter the original strength and safety performance of the tire. Although it is more expensive, it significantly quiets the cabin. When repairing a tire, remember to remind the technician about the presence of this special material inside.

[ElizabethLee]

This design is actually quite ingenious. In the past, riding in older car models often gave me a headache due to tire noise. Nowadays, many mid-to-high-end models feature sound-absorbing foam layers inside the tires. The principle is to use porous materials to absorb vibration sound waves, especially reducing noise by more than ten decibels during high-speed driving. Engineers say this doesn't affect the tire's grip or drainage functions but instead enhances ride comfort. Note that repairing such tires requires choosing a professional shop, as ordinary small repair shops' tire repair machines might damage the internal structure. Although the cost is higher, the improvement in cabin quietness is indeed significant.

[DiBraxton]

Last time I accompanied a friend to change tires, I learned that some premium tires have a layer of foam attached to the inner wall. The mechanic explained this is to address tire resonance issues—when the vehicle is driving at high speeds, the tire cavity can produce low-frequency noise like a drum. The sound-absorbing foam is specifically designed to counteract this humming sound. Especially for pure electric vehicles, this design is even more necessary due to the lack of engine noise to mask it. The foam is made of special material that won’t melt or affect heat dissipation. However, it’s important to note that if you get a puncture, you should find an experienced shop for repairs, as the standard tire repair process can easily damage this layer. Overall, it’s a thoughtful design to enhance comfort.