Re: [問題] 輪框的spoke數多寡

[john0312 (Chen John L)]

關於幅條數這個議題, 之前在網路上看到一篇編輪文章

有討論到這段. 雖然該篇文章之前已經有板友ohmylife兄

全篇翻譯過: http://blog.xuite.net/ohmylife/bicycle/22133245

但似乎他沒有翻譯到幅條數這段, 可能是這段是近期才加進去的.

因此我將討論幅條數這段節錄出來翻譯. 抱歉我的中文不是很好,

翻譯中若有文筆不順, 敬請見諒.


原文: http://sheldonbrown.com/wheelbuild.html

----------- 翻譯開始 ----------

; Up until the early 1980s, virtually all adult bikes had 72 spokes.

; 32 front/40 rear was the standard for British bikes, 36 front and rear for
; other countries. The exception was super-fancy special purpose racing wheels,
; which might have 32 spokes front and rear.

在1980之前, 幾乎所有成人腳踏車都有72跟幅條.


前32/後40是當時英國腳踏車的標準, 其他國家的腳踏車採用前36/後36.

唯一的例外是當時比賽專用的高檔腳踏車用的輪組, 他的前輪跟後輪

只有32根幅條.


; The Great Spoke Scam: In the early '80s a clever marketeer hit upon the
; idea of using only 32 spokes in wheels for production bikes. Because of
; the association of 32 spoke wheels with exotic, high-performance bikes,
; the manufacturers were able to cut corners and save money while presenting
; it as an "upgrade!" The resulting wheels were noticeably weaker than
; comparable 36 spoke wheels, but held up well enough for most customers.

幅條數大騙局: 在1980s初期, 有聰明的商人想到一個方法, 就是在

所有一般成車中都使用前後32根幅條. 由於一般來說, 32根幅條就代表著

比賽專用的高檔腳踏車, 因此製造商能夠同時偷工減料, 而且還能說這輪組

是"升級版本". 結果就是, 這些輪子強度比原本的差, 但對於大多數人來說

還是夠用的.


; Since then, this practice has been carried to an extreme, with
; 28-, 24-, even 16-spoke wheels being offered, and presented as it they
; were somehow an "upgrade."

此後, 這招被變本加厲的使用, 出現了28, 24, 甚至16根鋼絲的輪子.

這些輪子也被商人宣導成"升級版本".


; Actually, such wheels normally are not an upgrade in practice. When
; the spokes are farther apart on the rim, it is necessary to use a
; heavier rim to compensate, so there isn't usually even a weight benefit
; from these newer wheels!

事實上, 這些輪子一般來說並沒有升級. 當幅條與幅條在輪框上的

距離越遠, 就必須使用越重的框來補償, 所以一般來說, 這些少幅條

的輪組甚至沒有重量上的優勢.


; This type of wheel requires unusually high spoke tension, since the
; load is carried by fewer spokes. If a spoke does break, the wheel
; generally becomes instantly unridable. The hub may break too; see
; John Allen's article. http://bikexprt.com/witness/product/wheels.htm

這種輪子需要異常高的幅條張力, 由於附載是由比原本更少數的幅條

支撐. 如果幅條斷了, 這輪子立刻就不能繼續使用了. 甚至花鼓可能都會

壞調; 詳見 John Allen 的文章. http://bikexprt.com/witness/product/wheels.htm


----------- 翻譯結束 ----------

; 推 estudiante:為什麼少了那麼多根還能保持強度呢@@?

因為他用了比較強的框.

; → LukeForward:1.空力2.輕量3.省工4.美觀大方

1, 3, 4確實是事實. 不過針對1, 之前看到Brandt Jobst有一段說明[1].

------

; Besides, disk and composite wheels with 3 to 5 spokes have replaced
; low-drag spoked wheels in most events where wind drag is the primary
; concern.

另外, 在空氣主力為主要因素的比賽中, 只有3~5根幅條的刀輪

已經取代少幅條數的傳統輪.

------

因此如果真的要注重空力, 應該選擇刀輪/版輪,

而不是幅條數少的輪組.



[1] Brandt, Jobst. The bicycle wheel. 1993. 66. Print.

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