一场突如其来的大雪让很多汽车"现了形"，踩油门不走、上坡轮胎空转、打方向响应慢、刹车距离多好几倍，哪怕没有雪，冬季低温下刹车距离也变得 更远。都是轮胎，为什么夏季胎一到冬天就"水土不服"呢？夏季胎和冬季胎区别在哪儿？ 轮胎为什么要分夏季、冬季？ 《冬季胎、夏季胎、全季胎有何区别？》一文讲过，夏季胎、冬季胎的性能特点，主要是针对不同季节的气候条件和道路状况而设计的轮胎。为了保证 不同的工况特点而开发出相适应的轮胎，因此汽车轮胎分为了冬季胎和夏季胎。 夏季胎是专为炎热气候而设计的轮胎，其价值主要体现在高温环境下。夏季的高温不仅气温升高，地表温度的上升更是惊人。在炎夏时节，地表温度可 达60℃~70℃以上。普通轮胎在这种高温地面上行驶，橡胶材质可能会过度软化，导致磨损加剧、滚动阻力增加以及自身摩擦生热。轮胎自发热是一种需要 极其注意的情况，轮胎在每次滚动变形时，橡胶内部的分子链、材料界面以及钢丝束带的应力都会产生热量，过多的热量就会导致轮胎泄气、爆胎等危害。 为了避免轮胎产生过多的热量，就需要优化内部的结构，以更合理的接地印痕，减少带束层的应力，优化橡胶与炭黑的结合，让轮胎生热指数 Temperature Inde ...

Core Viewpoint - Xiaomi Auto denies the existence of "big customer managers" and any cash subsidies for vehicle orders, urging consumers to rely on official channels for information [2][4]. Group 1: Xiaomi Auto's Clarifications - Xiaomi Auto officially announced that there are no "big customer managers" or cash subsidies for vehicle orders, advising consumers to be cautious of misleading information [4]. - The company emphasizes the importance of verifying information through official channels to avoid financial losses [4]. Group 2: YU7 Vehicle Specifications - The YU7 model will be officially launched at the end of June, alongside other products like the Xiaomi Pad 7S Pro and REDMI K80 Supreme Edition [2]. - YU7 incorporates multiple safety measures for its battery pack, including a 1500MPa protective beam and a bulletproof coating to absorb impact energy and reduce damage from scratches [6]. - The YU7 features 245/55 R19 tires, where "245" indicates a width of 245mm and "55" represents a sidewall height that is 55% of the width, enhancing comfort and range [8]. - The YU7 achieves a maximum range of 835km under CLTC conditions, balancing comfort and performance [8]. - The vehicle's stability is enhanced through custom tuning of tires and a chassis system with electronic stability control and redundant braking systems [8]. - For improved handling, the YU7 offers an option for rear tires sized up to 275/40 R21, allowing for a narrower front and wider rear tire configuration [8].