jeffyeh1021 wrote:
請問有哪種胎，時速8...(恕刪)
1. 理論值：胎壓打到36PSI，輪胎水飄臨界速度為99.6公里／小時，https://forum.u-car.com.tw/thread/307829/%E8%BD%89%E8%B2%BCHydroplaning%E6%B0%B4%E9%A3%84%E7%8F%BE%E8%B1%A1！
胎壓 水漂臨界速度(海哩/英哩/公里)
30 49/57/90.7
40 57/66/105.6
50 64/73/118.5
60 70/80/129.6
70 75/87/138.8
80 81/93/150.0
胎壓50PSI，輪胎水飄臨界速度為118.5公里／小時，CLA的胎壓不可能是50PSI，但車速肯定超過120公里／小時，所以CLA遇到外側積水進而產生輪胎水飄而打滑是必然的，即使是新的輪胎！在台灣的高速公路內外側容易積水（低窪處），遇大雨時速降到９０甚至８０比較安全，性能車（輪胎更寬）要小心謹慎！
我合理懷疑：台灣高速公路普遍排水不良可能跟drainage gradient不夠有關係！另外原來兩道拓寬成三道，更顯得增加drainage gradient的必要，不然兩側的積水更可能影響內外兩車道！
2. 單導向胎（參考：https://www.tirerack.com/tires/tiretech/techpage.jsp?techid=16）！
Directional tread designs (sometimes called Unidirectional tread designs) are frequently used on tires intended to better resist hydroplaning. Their multiple tread grooves are aligned in a repeating "V" shape to increase the tire's ability to channel water from between the tire's footprint and the road. Somewhat like the vanes of a water pump continually pushing water in one direction through the engine, the grooves of a directional tire are designed to push water in one direction through the tire (forward on an angle to the sides). Directional tread designs are especially helpful in increasing hydroplaning resistance when relatively wide Plus Two, Plus Three or Plus Four tire and wheel applications result in fitting a much wider tire to a vehicle than its Original Equipment size.
單導向輪胎專供高速行駛，具有較強的公路性能。為強調輪胎的抓地力，胎塊設計較大，橫切紋比較少，胎紋一般都是同一方向，也就是說這種輪胎只能朝著一個方向跑。為使輪胎行經濕地時能夠做到快速排水，特別加強了中央排水槽，具備了極強的排水能力，使單導向輪胎的濕地性能與非單導向輪胎相當，甚至比非單導向輪胎更佳。
原文網址：https://kknews.cc/zh-tw/car/rkbp4n.html
