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W**H
发帖数: 252 | 5 Usually every 5000~7000mile, you need to rotate your tires to maximize their life span, front left <-->
rear right and right front <--> rear left.
Measuring Tire Tread Depth with a Coin
http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=51
Suggest to have your car checked, if the problem is coming from tires only,
replace them at costco (wait for $70 or more coupon, every a couple of weeks
)or sams. Check their web sites for service details. |
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d***a
发帖数: 13752 | 9
嗯...我觉得不象。看看这个。虽然是tirerack说的，但确实做AWD的厂家有这样的建议
。虽然说这是它们的AWD做的不好，但现实是不少全时的AWD有这个问题。
http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=18
Here are recommendations from some of the manufactures that the Tire Rack
currently serves for matching the tires used on their four-wheel drive and
all-wheel drive vehicles. Additional recommendations from other Original
Equipment Vehicle Manufacturers is pending.
Audi As published in their vehicle owner's manual, "rolling radius of all 4
tires must re... 阅读全帖 |
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f*******r
发帖数: 5301 | 11 1. 四驱vs.轮胎。有人说四驱没用，好轮胎才有用。其实好的四驱提供200%的牵引力
和发动机制动力。一般雪胎只要求在雪地上能达到普通轮胎110%附着力。所以我觉着
四驱普通胎还是比普通车加雪胎牛多了。当然最牛还是全时四驱加雪胎，这时候雪地
通行能力相当于普通车的220%。所以轮胎还是很重要的。几万块的四驱车都买了还舍
不得几百块的轮胎吗。
2. 雪胎 vs 普通轮胎。一个轮胎是不是雪胎，不只是看设计，而是要通过标准测试：
http://www.tirerack.com/winter/tech/techpage.jsp?techid=125
也就是说，和标准普通轮胎相比，雪地附着力超过110%才算雪胎，也就是满足所谓
的"severe snow" service rating。过了这个测试，轮胎上才可以有mountain
snowflake标志。一般来说，看一个轮胎是不是雪胎，最简单的就是到侧壁上找这个
标志:
一般来说，雪胎和四季胎是不能互换的，雪胎不能当四季胎用，但是也有极少数例
外，比如说Nokian WR以及下文提到的BFG All-Terrain T/A KO。
3. 全地形... 阅读全帖 |
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f*******r
发帖数: 5301 | 12 1. 四驱vs.轮胎。有人说四驱没用，好轮胎才有用。其实好的四驱提供200%的牵引力
和发动机制动力。一般雪胎只要求在雪地上能达到普通轮胎110%附着力。所以我觉着
四驱普通胎还是比普通车加雪胎牛多了。当然最牛还是全时四驱加雪胎，这时候雪地
牵引力相当于普通车的220%。所以轮胎还是很重要的。几万块的四驱车都买了还舍不
得几百块的轮胎吗。
2. 雪胎 vs 普通轮胎。一个轮胎是不是雪胎，不只是看设计，而是要通过标准测试：
http://www.tirerack.com/winter/tech/techpage.jsp?techid=125
也就是说，和标准普通轮胎相比，雪地附着力超过110%才算雪胎，也就是满足所谓
的"severe snow" service rating。过了这个测试，轮胎上才可以有mountain
snowflake标志。一般来说，看一个轮胎是不是雪胎，最简单的就是到侧壁上找这个
标志:
一般来说，雪胎和四季胎是不能互换的，雪胎不能当四季胎用，但是也有极少数例
外，比如说Nokian WR以及下文提到的BFG All-Terrain T/A KO。
3. 全地形轮... 阅读全帖 |
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d***a
发帖数: 13752 | 13 除冬天之外，6/32足够了。多数州的法律要求是2/32必须换。
http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=51
"According to most states' laws, tires are legally worn out when they have
worn down to 2/32" of remaining tread depth."
"If rain and wet roads are a concern, you should consider replacing your
tires when they reach approximately 4/32" of remaining tread depth."
"If snow-covered roads are a concern, you should consider replacing your
tires when they reach approximately 6/32" of remaining tread depth to
... 阅读全帖 |
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G******t
发帖数: 1782 | 15 这个星期西雅图附近下了不少的雪。累积起来估计一个英尺不止了。是难得的锻炼学习
的机会。因为要出门，这个星期在雪地里开了三百多迈。如果可以买雪胎的话，雪胎还
是好一些，刹车距离比四季胎短1/3左右，转弯速度也可以有很大提高。不过安全第一
，慢一点就慢一点吧。我的车有四驱，但是轮胎是四季胎，还是慢一点的好。在有积雪
的高速上开大概45-55MPH，没有积雪的地段按正常速度。
星期天回家差一点出事情，多谢版上一些有经验的司机们指点。
http://www.mitbbs.com/article0/Automobile/33018815_0.html
事后温习了一些别人的经验，简要列在这里，欢迎方家指正。
1)最重要的一点：能不出门就在家呆着。 要出门的话尽量挑白天：白天视线好，容易
控制。
2）慢。尽量放慢速度，随大流，不超速。 加速减速都要慢。给油踩刹车都要轻。如果要
停车，远远地踩刹车。有冰的路上刹车距离要长很多。雪地平地上开车车速30MPH如
果用四季胎的话，刹车距离大概在30米左右。积雪的高速上限速比平常低很多，一般是45MPH。
3)尽量不要完全停下来。如果能避免全停的话就不要停（譬... 阅读全帖 |
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l********i
发帖数: 8858 | 22 前驱车 新胎放后轮
When tires are replaced in pairs in situations like these, the new tires
should always be installed on the rear axle and the partially worn tires
moved to the front. New tires on the rear axle help the driver more easily
maintain control on wet roads since deeper treaded tires are better at
resisting hydroplaning.
http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=52 |
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d********3
发帖数: 7220 | 30 学习了，从tirerack看到的
http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=13
The term "blowout" is generally used by drivers to describe a bursting tire
accompanied by a rapid loss of air pressure. While one might assume that all
blowouts are caused by too much internal pressure bursting a weak spot in
the tire, the main reason for them is just the opposite. Most blowouts are
caused by too little air pressure allowing the tire to flex beyond its
elastic limits until it overheats to the point w... 阅读全帖 |
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d***a
发帖数: 13752 | 37 呵呵，我说的其实是汽车常识。这可不是现想出来的。实际上并不是我想出来的。:)
http://www.tirerack.com/wheels/tech/techpage.jsp?techid=108
Additionally, a vehicle's rotational weight includes all parts that spin
including everything in the vehicle's driveline from the engine's crankshaft
to its wheels and tires. This affects the energy required to change speed
as the vehicle accelerates and brakes. |
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发帖数: 1 | 39 FacebookTwitterGoogle+PinterestMailWINTER / SNOW TIRE TECH
Higher Tire Pressures for Winter Driving
Several vehicle manufacturer's owner's manuals recommend operating winter
tires several psi (typically 3-5) higher than their recommended pressures
for summer and all-season tires. While none of them actually provide the
reason why, there are several scenarios that would support the practice
http://www.tirerack.com/winter/tech/techpage.jsp?techid=168
如果强迫你二选一的话。 |
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t****g
发帖数: 35582 | 47 【 以下文字转载自 Hardware 讨论区 】
发信人: tyning (全副*你上过了么？), 信区: Hardware
标 题: 这个有前途，e-ink killer
发信站: BBS 未名空间站 (Wed Feb 17 09:50:43 2010, 美东)
高通的，刚刚展示prototype
http://www.mirasoldisplays.com/mobile-display-imod-technology.php?p=2&techID=2#
利用MEMS驱动的air gap干涉反射环境光做display。无需背光，所以和e-ink类似，甚
至更省电。靠不同厚度的air gap来选择波长产生不同的颜色。理论上说，如果 air
gap的厚度无级可调的话可以产生无穷中颜色而不止是rgb。
这东西很creative呀，简单的说就像一个可以分点阵控制厚度的肥皂泡，在太阳下通过
控制肥皂泡的厚度来显示文字和图案。 |
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