*English version below*
曾經有兩個電話 (懷疑係同一人) 打黎,
第一人
👨: "您地貨van呔係咪8浸呔, 要8浸呔, 貨van先驗到車"
👀: "平時裝開貨van呔夠磅就驗到車喎?"
👨: "係夠磅呀, 不過要8浸"
👀: "平時裝開貨van呔夠磅就驗到車喎?"
👨: "係夠磅呀, 不過要8浸"
第二人
👨: "您地有冇8浸呔, 話要8浸呔先驗到車"
👀: "有8浸呔, 唔駛8浸都驗到車"
其實我好少會同啲唔熟既人去爭論一樣野. 都曾經同過一間話自己做車行咁多年既老細, 問佢點解一定要 106/104 先可以驗到貨van. 而佢既答覆只係 "因為驗車個個人講, 我做左咁多年, 就係一定要咁先驗到", 但又答唔到我點解貨van 呔會有兩個負重 106 / 104
係未深入了解 "浸" 數之前, 先講下貨van 一定要 "8浸" 先驗到車呢個問題.
1. 現時市場上被列入輕型貨車系列 :
a. 電動貨van 日產env-200
跟車呔係 185/65 R15 92V Goodyear, 係一款私家車呔, 冇浸數.
b. 現代貨van Staria (新款貨van)
跟車呔係 215/65 R17 108H, Kumho PorTran KC53, 冇浸數顯示.
c. 豐田 Hiace 300
跟車呔係 215/70 R16C 石橋 貨van 呔, (歐盟標籤顯示只得6浸)
上面全部都唔係 8"浸" 呔, 唔通可以批到有問題既全新車入黎香港銷售?
佢一定係到暗示緊, 215/70 R16C 有好多貨van 呔都過唔到驗車, 包括 石橋, 東洋個啲, 只係得好少啲先過到驗車................................
如果係以前仲用緊有內膽既呔 ("帆布呔", bias-ply) , 就的確係注重 "浸"數呢樣野. "浸"數係"帆布呔"年代, 直接反映出個條呔有幾多層 (結構), 可以負重幾多. 越多"浸"就負重越多.
而家既年代係用緊 "鉛子呔" (可能有啲人會叫 "空心", radial tires). 設計上既物料已經有足夠承托力, 其呔肚位顯示既 "浸"數代表住條呔有幾 "硬正", 已經不再是講緊條呔入面有幾多層.
係香港驗貨van, 都需要跟據輪胎上所示既負重去驗車. 雖然 374A 冇特別提到輪胎負重字眼 (但要裝岩負重係常識吧?), 更沒有提到一定要 "浸數" (只提到有關結構 及適當大小及設計的充氣輪胎), 但由於 "浸數" 已經不再是有關鉛子呔的幾多層問題, 對於負重已無直接關係. (有情況下, 某牌子6浸係有可能負重大於其他牌子的8浸)
如果個位係一名車主的話, 我建議您問多幾十間呔鋪睇下佢地點答您. 反正我講完您都唔會信. 問多幾十間, 您應該自然會信.
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Over the past years, there were two ppl called up and asked:
First peson
👨: "Does your van tire have 8 ply rating? Only 8 ply rating can pass light goods vehicle inspection"
👀: "The commercial tire that I installed on van have more than enough loading index to pass"
👨: "Yes, but need 8 ply rating"
Second person
👨: "Do you have 8 ply rating van tire? I heard that only 8 ply rating van tire can pass the inspection"
👀: "We got the 8 ply rating, but it is not necessary to be 8 ply for passing."
I rarely argue about something with those whom I am not familiar with. An owner of a vehicle dealer told me that he needs the loading index to be 106/104 in order to pass the inspection. His explanation was "somebody in the inspection center told him it has to be 106/104. I had been in this area for so many years, and this had to be the way", and yet he failed to explain why commercial tire has two loading index.
Before talking about ply rating, check out the below light goods vehicle to find out about 8 ply rating queries.
1. Nissan env-200 electric van
Original equipped tires were 185/65 R15 92V Goodyear, a passenger car tire without ply rating stated.
2. Hyundai Staria (new van model)
Original equipped tires were 215/65 R17 108H Kumho PorTran KC53, without ply rating stated.
c. Toyota Hiace 300
Original equipped Bridgestone 217/70 R16C R660A, EU label stated it only has 6 ply rating.
All the above light goods vehicle are without 8 ply rating tires equipped. Is it possible to have a failure equipment approved to enter Hong Kong market for sales?
Is he trying to tell me that 215/70 R16C only a few tire model available approved to be installed on van.
Those such as Bridgestone, Toyo only have 6 ply rating.
Two/three decades ago where bias-ply tire still in used, ply rating is an important indicator to check if it can be installed. It implies how many layers does a tire have. The higher the rating, the higher load it can support the vehicle.
However, this generation is using radial tires (without anything inside). The design and materials provide sufficient strength to the radial tire (which shows as loading index). The ply rating on the radical tire implies how "strong" the tire is, but it's not about the layers of the tire anymore.
To pass the inspection, you only need to check out the loading index. Although 374A does not clearly specifies tire loading index (but it's common sense right?), nor specify ply rating (only structure of tire and appropriate tire size and design are stated), the ply rating is no longer directly related to radial tire loading index, and hence does not need to check the ply rating for regulation. (some brand with 6 ply rating might even have higher loading index than 8 ply)
