打呔氣 tyre air pressure - part ii

除左跟番汽車標示上既呔氣, 另一樣野就係睇下打的咩氣入去.

其實我地呔鋪都係打空氣入去 (先聲明左先) , 同油站個的打呔氣既氣都一樣.

有的呔鋪 / 車行就打氮氣 (Nitrogen) 入去.

兩者分別在於, 打空氣入去, 呔既氣溫上升時, 空氣因氣溫上升而脹左. 令到你既呔氣都會大左(壓力). 

最好打氣既標準, 就係行完車睇下呔氣升左幾多. 如果本身要打32psi, 原先有打左32psi 的話, 已行完車之後升到上35psi 既話, 咁可能你會想放番的氣到29psi / 30 psi. 行車時就會行番32psi 啦.
(再睇番個post 發現原來我打錯, 一定係最近太熱, [幫自己搵緊excuses ><] ) 最好打氣既標準, 應該係條呔唔熱(正常溫度)既時候, 打番個個氣壓. 如果標籤寫32psi 的話, (而條呔係正常溫度下), 打番32psi.


而再詳細的更標準既係, 唔同溫度應該打番唔同既汽壓, 如夏天, 就會打32psi, 冬天打少的咁之類既野, 但係避免咁煩, 都係未開車之前打番個標準氣壓, 或者係開車後隔一陣先再打. (如果趕時間等唔到條呔cool down 番, 直接打32psi 或打多少少)

打32psi 即係最底既呔氣壓, 都係車廠建議的. 但係我又覺得奇怪, 又冇講到係用氮氣做標準, 定係普通既空氣做標準. 係咪因為太複雜, advise 人地打最底既呔氣壓?

(有少少緩衝都冇問題既)

其實冇乜人check 到咁嚴既, 只要行得好就冇乜所謂. 不過氣壓太多既話除左部車會彈下咁之外 都有機會"省"兩邊呔的 (下次再講)

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To be more professional, it's important to check what type of gas is pumped into the tyre.

Actually our store pump normal gas into the tyre  (For your information) , the same as gases used in the petrol station.

For some tyre store / car maintenance company, they pump in Nitrogen

The difference is that Nitrogen is not easily affected by the temperature, but normal gas's kinetic energy increases when temperature increases. When tyre temperature increases, air pressure in the tyre increases as well if you are using normal gas. 

The best way of ensuring the standard of air pressure, is to check how much tyre pressure increases after you started your car and drive for some time. If you are supposed to have 32psi for your tyre, and you have already pumped in 32psi at the beginning, the tyre pressure increases to 35 psi after driving, then you may want to release some of the gas in the tyre to 29 / 30psi. 

(Revising the post and found out that I had written wrongly about the tyre pressure. It must be the heat!! [ Finding excuses for myself >< ]) The label on the car indicates the tyre pressure in cold temperature. If the label states 32psi, then it's recommended to pump in 32psi under normal temperature (which I assume is room temperature and pressure)

There is actually a complex matrix to tell drivers how much tyre pressure should be pumped in under different temperature. E.g. pumping in 32psi during summer, and a little more psi during winter.

To avoid complication, simply pump in the recommended tyre pressure on the label when the tyre is not hot would be good enough for most of the drivers. (If you don't have the time to wait for the tyre to cool down, just pump in 32 psi, or a little more would be fine)

In sum, 32 psi (in this example) is the minimum tyre pressure you should pump in. Car manufacturer did not mention the best tyre pressure when the car tyre has "warmed up", and did not state whether to use Nitrogen as standard, or normal air as standard. Perhaps it's too complicated to involve in tyre?

(a little buffer should be fine for your driving)

Actually we don't really have to check so serious that we have to follow the rules as long as it does not affect our driving. However, if you pump in too much air, not only if you feel your car is "jumping" kind of feel, your tyre tread may worn off easily at two side (which I will talk about in the next part)

打呔氣 Tyre Air Pressure - part I

平時有客問, 打幾多氣落條呔先岩呢? 我發現冇乜人會同大家講, 其實係司機位有個標籤, 個到有寫到要打幾多先係最岩部車既呔氣既.

好似呢部 Honda Civic 1.8 i-vtec 就寫住 前呔係220 (kPa), 或者係 2.2kgf/cm square 或者係 32psi.
通常會用到既單位都係 psi, 係油站應該會見到kPa 或者 psi 的. 所以跟住呢個打呔氣實冇死.
唔係架架車都寫psi 的, 有的只係寫左kPa, 所以如果大家睇慣左psi 既話, 就要自己轉番做psi 啦.

如果自己部車本身有sensor 既, 不妨都可以用到呢個做指標, 如果明明打足佢寫既psi 都話有問題, 咁就一係個sensor 問題, 一係就用個個儀器有問題了. 反正就係可以再用另一個儀器再睇, narrow down 到可能真係個sensor 問題既話, 就會係一係set 錯psi, 一係就有壞左.

另外標籤有寫上原裝呔既尺寸, 如果買車既時候見到條呔同呢個標籤有出入, 就一定係改過size 的了.

English Version
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How much air pressure is considered sufficient for your tyre? Well, I discovered that not much people will tell you about the label at your driver's seat door. Actually, the label will tell you what's the best air pressure for your car.

In the case of Honda Civic 1.8 i-vtec below, it stated 220 (kPa) or 2.2kgf/cm square , or 32psi. Normally we used psi as unit to pump air, and you should find both kPa and psi units when you pump air at the petrol station. Following the label shown, you will definitely know how much air should pump in.

Not all cars label are created equal (of course). Therefore, if your find your the label only show one unit, (and you are not accustomed to that unit), you will have to convert the unit for yourself.

You can also check your car tyre sensor (if you have one) by using the label air pressure as standard. Since it's the air pressure suggested by the manufacturer. If you have pumped the air pressure standard suggested and yet the sensor still shows there is something wrong with your tyre, then it's either there's fault in the sensor, or the equipment that you used to pump air. Either way, you should be able to find out for yourself.

The label also stated the original tyre size for your car. Therefore, if you find the tyre size is different, well, you know what it means.

呔氣指標蓋 Tire Pressure Indicator

之前有睇過有個蓋cap 住係條呔既喉咀到. 好似下面呢個咁

綠色: 代表呔夠氣

紅色: 代表呔唔夠氣, 要打氣

睇落好似簡單又易用, 一開始都而為佢仲勁過而家個的用手機睇呔條既儀器, 但發現其實唔係.

問左個賣家, 佢話, 入面其實set 死個呔氣指標. (不過冇問到set 左幾大指標) e.g. 廠set 左係36 psi 既呔氣, 但係你平時打氣係32psi 既話, 你用左佢既話, 就永遠都係出紅色, 而舊野係自己冇得改. 

如果你打算買既話, 或者己經買左既話,  就要問下佢地係set 左咩指標先好買啦, 或者黎我地到, 我幫你睇個舊野係set 左幾多psi.

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Below tire cap, I believe, is not uncommon to every driver. It's used to track tire pressure.

Green: indicates sufficient tire pressure

Red: indicates insufficient tire pressure, you need to pump more air

It looks simple and easy to use, and sort of better than those other devices that used smartphone to monitor the air pressure. But it turns out it's not really the case. The seller told me that, the pressure indicator is fixed at the cap (though I didn't ask what's the pressure set). Let's say if it's set at 36 psi, and you normally pump air to 32 psi, it will always show red light. You cannot change it, nor the seller.

If you are planning to purchase, or you already had it, you may want to check out the pressure fixed at the cap. (you are welcome to come to my store and I can find it out for you too :D )

粉嶺高速公路既朋友要小心駕駛 Becareful when driving along Fanling Highway

好誇張, 連續有兩位朋友係粉嶺高速公路, 起緊天橋既附近既路段爆呔, 先分享下第一個既爆呔相

第一張睇落去好似冇乜野, 好似只係普通中釘, 但係一折開, 就見到成支叉插入去咁, 救唔番. 諗住以為只係中釘爆呔, 點知搞到咁

第二位朋友, 仲可怕. 佢形容一開始聽到車底 "bon" 一聲, 以為車底撞到野, 點知係條呔爆左. 拖車黎到, 折黎一睇, 呔鈴都穿埋, 都唔知俾的咩搞到咁

所以, 經過粉嶺高速都係小心留意下路面

(English version)

Unbelievable. It's probably the only words that I can think of, when two customers (not on the same day) came with their tyres unable to patch. If you are driving along the Fanling Highway, please be extra careful. 

The first looks like some sharp metal object puncture. 

When we took out the tyre, the object was so sharp that it puncture like a fork towards the rim. Unable to patch.

The other customer described his experience, when he drove along the Fanling highway, he heard a "bomb" sound under the car. He thought something big hit the car but it turns out it's his tyre that went out of air. When he came to our store and took out the tyre, then he saw there is a big hole at the rim. What the? What kind of things could pierce through the rim?

Well, just be extra careful when you are driving at the fanling highway. 

私家車呔 vs 輕型貨車呔

最近掛住寫code, 終於係個月前寫好左一個簡單既online shopping.

因為仲未有太多既資料, 所以你有可能搵唔到你既車呔size. 如果真係搵唔到既話, 打黎搵我地叫我地報下價.

And, 除左私家車, 都有輕型貨車架, 所以你地可以禁入去望一望睇下車呔係咪for 私家車定係 for 輕型貨車. (呢個係我做得唔係咁好, 會遲少少改進番, 等大家易的去睇)

在係呢到講多的有關兩者之分

因為有的車呔既size , e.g. 205/65 R16, 可以係私家車呔, 都可以係輕型貨車呔

(如圖下,  第一個牌子HiFly 係for 輕型貨車, 第二個牌子Falken 係for 私家車呔)

所以有時的呔鋪問番轉頭話, 係輕型貨車定係私家車, 唔想報錯價.

要知個條呔係私家車定輕型貨車, 係我地個網禁個張相, 或 "詳細" 就可以見到車呔規格既左下角係私家車, 定輕型貨車.

其實咁平時上網搵, 仲有另一樣可以好快知, 就係睇條呔既 show 出黎既size.

部分輕型貨車呔size 會有: C (或其他字母, 通常都係C), 係Rim size 後面, 如上圖HiFly 就有

205/65 R16C , 

另外就係睇車呔size 既 loading index. 輕型貨車呔既loading 會有兩個指標 -> 107/105T

107 代表當一條呔放係左, 另一條放係右, 既重量等級, 105代表當兩條呔放係同一左, 或同一右既重量等級. 

如果個網有的咩唔好, 告知小弟等我可以improve 下

法律最底要求的呔紋深度, 用硬幣check 下自己條呔

可能大家都知道呢樣野, 或者都唔會理會呢樣野, 因為知道條呔一唔對路, 其實可能要換.
今次小弟都長氣講下.

平時我地都會睇既 "運輸署" 既網頁睇到, 最底既呔紋深度既要求係 1毫米(mm)
驗車既話, 都可以肯定條呔冇1mm 深都一定過唔到. (下次我又分享下平時都會有客為左驗車, 都唔會買新呔, 因為都打算賣車)


點先知道條呔合唔合法律要求? 唔駛用間尺既, 用硬幣就得啦.
只要你身上有硬幣, 就可以用下面呢個方法去量下. 任何硬幣都得的. 下面圖就用左個 $5 放上去條呔到.

如果你量到既高度, 係底過個5蚊既 "D" 字底 (或者係其他英文字母都係一樣), 咁你部車條車呔就唔合法律要求, 要盡快換了.

上面係用左5蚊, 其他如1蚊, 2蚊, 1毫, 2毫都可以量到的. 相同既方法. 都係底於個字母就係唔合法.

如果真係俾人捉到咁點算? 有的應該都係放你走叫你快的換. 會唔會俾人罰錢就暫時未見到. 如果見到都會同大家分享下.

不過小弟都識的法律, 見過發生過既案件, 一黎就連埋呢的一齊罰, 咁就睇落去好似會罰得甘的.

得我再研究多的, 再分享俾大家知.

(English version)

You may know this or may ignore it as the moment you feel there is something not right about the tyre, you may want to check and change it.

Yet, I apologize for being "long-winded" and still wanted to share this.

The transport department website mentioned that, the legal limit for your tyre tread depth is 1mm.

If you are bringing your car for a test with a tyre tread that's less than 1mm depth, it's self-evident that it will not pass. (Next time I will share with you all some may want to change some old tyre just to pass the test because they are planning to sell the car)

So, how do you know if your tyre meets the legal requirement? You don't have to use a ruler, just use a coin.

If you have a coin with you, you can use the following to measure your tyre depth. Any coin will do, to put in between the tyre tead.

如果你量到既高度, 係底過個5蚊既 "D" 字底 (或者係其他英文字母都係一樣), 咁你部車條車呔就唔合法律要求, 要盡快換了.

We use a 5 dollar coin as an example above. You can also use 1 dollar, 2 dollar, 10 cent, 20 cent. using the same method. Tyre tread depth is below the letter indicates it's below the legal requirement.

If you get caught by government official, what will happen? Sometimes, they will ask you to change the tyre quickly. Whether you will be fined or not, I still have not checked out any cases yet. (Possibly not the one that you need to go to court)

Just a little knowledge in law, I came across cases where incidents occur will include the above charge of not passing the legal limit, thus making a fine heavier (looks like it)

If I manage to know more about it, I will definitely share it with you all.

換呔既你, 唧車要小心

上個月發生左次意外, 令到初入行既我都覺得可怕. 做呢行真係要好小心. 就算係車主 / 司機 / 係幫人地換呔既你都要小心.

上個月既頭條新聞, (下面條link), 就講到因為個車唧移位, 俾架車夾住左車底.

http://hd.stheadline.com/news/realtime/hk/1092931/

睇完之後, 即時心諗WTF, 好可怕.

通常私家車用開既類似呢隻, 唧起車門個邊位, 就算移位趺落黎都唔會整到自己. 但係who knows 可能需要落車底執番個呔芯? 或者係個screw? 

唧車都係小心的好. 

(Englier version)

There was an accident last month that triggered my fear to work in the tyre industry. Even if it's not in the tyre industry, whether you are a driver / car owner / other person that is helping someone (maybe a pretty girl? ) to change the tyre , really got to be careful.

A news article in the stheadline mentioned that a person passed away due to the improper use of car jack, which incidentally causing the car to drop and he was hit at the underneath of the car 

http://hd.stheadline.com/news/realtime/hk/1092931/

Normally using the above car jack should be safe enough even if the car drops in mid way since it's placed at the car door there. But who knows? you may need to get down to the car underneath to get the screw or some other things that require you to put the spare tyre?

Well, afterall, just to be extra careful in changing your car tyre