CAA建议提前更换雪胎 有那些需注意？

[lifelife]

CAA建议提前更换雪胎 有那些需注意？


加国无忧 51.CA 2010年11月4日 10:28 来源：本网综述 作者：牧涛


(本网综述) 昨日（周三），加拿大汽车协会（CAA）南安省分部呼吁，鉴于近期气温明显转冷、白日平均温度已接近7度，本省司机应该现在就更换雪胎，以便在寒冷或多雪的路面上操控车辆。


今冬宜提前更换雪胎
上周日（万圣节），多伦多已经降下初雪；进入11月以后，早晨的低温、寒风更让不少市民提前感受到了冬季气息。据气象人士预测，受“拉尼娜现象” （La Nina）的影响，赤道太平洋东部和中部海面温度持续异常偏冷，所以今年加拿大的寒冬、大雪将有可能比历年都来得大许多。

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（来源：680新闻）​

昨日（周三），加拿大汽车协会（CAA）南安省分部发出呼吁，由于近日的最低气温已经跌至7度以下，本省司机应该趁现在就更换雪胎。许多加拿大人总是要等到下雪才想起换雪胎，这是一个误区。
分部发言人埃斯图女士（Silvana Aceto）表示，当气温跌至摄氏7度或以下时，便是雪胎大显身手的时候。同样的温度下，夏季胎在地面上的摩擦功能几乎失效；而四季胎则会变硬、并失去弹 性，这将减低轮胎与地面的磨擦，让汽车需行走一段更长的路段才能停下来（见下图）。

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三种轮胎各有不同的适用温度范围​

据悉，雪胎可以在结冰、下雪、雪泥的道路情况下，提供更好的安全保障、避免汽车失控。如果冬日天气比较温和，四季胎可能还比较有效；但是温度越低，四季胎的性能越差，一旦遭遇特别寒冷(15度以下)的天气，四季胎便可能完全失效。
雪胎在冬季比四季胎的优势主要体现在两方面，一个是低温情况下比四季胎要软，从而保持了路面摩擦力；一个方面是雪胎花纹的设计和含有特殊材料硅石，有助雪胎在低温下保持弹，增加了湿地和冰面的抓地能力。
埃斯图女士表示，视乎天气、路况（road conditions）、车速，雪胎的刹车距离最多可比四季轮胎少四分之一（见下图）。

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CAA告诫司机，应切记同时更换四条雪胎，只换两条会令汽车在转弯时失去稳定性，也会影响刹车系统。
专家表示，如果司机只在后面两个驱动轮上换雪胎，当拐弯时汽车的后面会具有很大的抓地力，这会导致汽车直走（转向不足）。如果车是FWD(前轮驱动)，则拐弯时汽车前面会抓地很牢，而汽车的尾部则转向过度而可能产生摆尾。
埃斯图女士还指出，司机也应该趁天气还算好，添补一些冬季驾车的工具，例如小冰铲、保暖毛毯、防冻液、电筒、一块充好电的手机电池，并提前准备在汽车的后备箱里，以备不时之需。
同时，CAA也公布了的冬季行车指南，有需要的司机朋友可查看（点击下载）。


更换雪胎的注意事项
不管选择什么样的雪胎，必须有这样的标志：the Transport Canada/RAC mountain/snowflake，the Transport Canada是加拿大交通，RAC是Rubber Association of Canada （加拿大橡胶轮胎协会），印有mountain/snowflake说明该轮胎符合雪地驾车的要求。如果没有这些标志，说明不是雪胎。有的轮胎侧面刻有M & S（Mud & Snow），这既不是雪胎的标志，也没有标准依据，任何公司都能在轮胎上印这些。
不管轮胎公司如何吹嘘他们产品的性能，但是顾客必须知道：没有轮胎可以既在干雪上，又在湿雪上，冰路上，雪泥上和干冷的柏油马路上都表现最好。试图 在轮胎的一个方面加强性能，就必须牺牲另一方面的性能作为代价，所以顾客需要听取修车师傅的意见、根据自己平时驾车的路况，来判断、平衡这些因素。
入冬的时候，一些大的商店，如Wal-Mart, Canadian Tire, Costco等都会有销售轮胎的促销活动。这个时候是换胎的最好时候，价格也合适。如果家中有空闲的地方，比如较大的车库或地下室，不妨在购买雪胎的同时 也购买4个轮箍（rim），这样可以在每次换胎的时候省却扒胎步骤，避免对轮胎造成损毁。
购买雪胎的时候，需要记得一些自己汽车的信息，例如轮胎编号、车牌号（填单的时候用）等等。

 

[月下独酌]

有道理

我的夏季胎在最近这两天的温度里开车感觉非常不一样。。。。

 

[ccc]

四驱＋雪胎

 

[Martin]

四驱＋雪胎+ Slow Down...

今天换上了 :banana:

 

[Blu_water]

谢谢楼主转贴，今天也自己动手，换了雪胎。安全第一

 

[27149]

换上了 换上了

 

[lifelife]

有道理

我的夏季胎在最近这两天的温度里开车感觉非常不一样。。。。

四驱＋雪胎+ Slow Down...

今天换上了 :banana:

谢谢楼主转贴，今天也自己动手，换了雪胎。安全第一

换上了 换上了

:thanks:

 

[lifelife]

Why You Need Snow Tires - 10 Tips
http://www.carchick.ca/2010/10/why-you-need-snow-tires-10-tips.html

Snowtire-200 The chilly air and falling leaves are a reminder that winter driving season is just around the corner. You may be asking yourself the same question you ask every year: should you invest in snow tires or will your all-season tires see you through to spring? Joe Sforza of Active Green + Ross Service Centre in Mississauga, Ontario offers these tire tips and facts.

1. Determine the conditions you will be driving in. Are you a city driver or do you ski and participate in other winter activities? Is your schedule flexible – can you stay home in a snow storm or do you need to drive to work and get the kids to school? If you will be heading up north and have to drive no matter what the weather, you will want to invest in good winter tires.

2. All-season tires lose their grip in lower temperatures. Below 7 degrees Celsius, the rubber compound in all-season tires hardens and that means the tires lose their traction – think of a hockey puck skimming across the ice. Winter tires are made from a rubber compound that will maintain softness and grip in temperatures up to -45 degrees Celsius, which is why they are proven to have shorter stopping distance in winter conditions.

3. Consider how long you will be keeping your vehicle. If you plan to keep your vehicle for at three to five years, invest in snow tires. In that time you would have purchased two sets of tires anyway. If you buy winter tires now, you’ll be using them about five months a year and your all-seasons the other seven months. That means investing in your two sets of tires upfront, but you have the added benefit of added safety for winter driving.

4. Invest in winter rims. Some people try to save money by using only one set of rims and transferring their tires each season. But with the extra cost and potential damage of mounting and dismounting both sets of tires, you’ll actually save money in the long run by investing in winter rims for your winter tires.

5. Choose “hub-centric” over “multi-fit” rims. In tire ads, you may see these two rim options available. The difference is that with on multi-fit rims the centre hole is enlarged to accommodate different tire sizes, but with hub-centric the centre hole matches the vehicle. The benefit is that there is less stress on the lug nuts and less chance of vibration at high speeds. Hub-centric are slightly more expensive, about $10 more each, but they can save your tires from potential damage and improve your ride.

6. Change all four tires. Many people ask if they need two tires or four. The answer is four. For one thing, if you are going to use your tires half the year as in point 3, you will need to change all four, otherwise your set of all-season tires will wear unevenly. Also, changing two tires is like being half safe – it can cause over-steer (fish tailing) or under-steer (turning the wheel to the left or right while the car continues forward).

7. Don’t wait for the first snowfall to change your tires. It happens every year – everyone waits until the last minute to change to their snow tires, then the first storm hits and the service centres are packed. Avoid the stress and plan ahead. It’s good to change to your snow tires when temperatures are consistently below 7 degrees Celsius, usually mid- to late-October.

8. Don’t let storage issues keep you from being safe on the winter roads. Many condo and apartment dwellers don’t invest in snow tires simply because they have nowhere to store them. There are companies and tire dealers who can store your tires during the off season for you for a nominal fee, which is much less than the cost of even a minor fender bender these days.

9. Store tires on their sides. Stack the tires you’re not using on the side walls, not on the tread. This will avoid flat spots from developing on your tires.

10. Check the tread depth at the end of the season. A snow tire is no longer considered a snow tire when the tread has worn to under 5 mm – then they are no different from all-season tires. Winter tires should last three to four winter seasons, but this will vary based on how much driving you do. It is best to check the tread at the end of the season. That way, you will know if you need to purchase new tires in the fall, and can budget for this expense.

If you have more tire questions, you can call Joe Sforza at 905-629-8794 or email 1151@activegreenross.com.

 

[lifelife]

印有mountain/snowflake说明该轮胎符合雪地驾车的要求 --- 雪胎上都有一个山或雪花的标志

 

[joker I]

有道理!

 

[lindamy]

四驱＋雪胎+ Slow Down...

今天换上了 :banana:

请教一下，像CRV这种车，四驱是自动加上，还是需要调整什么设置？