I was simplizing my opinions. Yes, Your comment is correct, but it is more for pros and semi-pros. For amateurs or beginners, it may take several ridings or time to figure out all those paramenters you mentioned after they bought a bike or borrowed one. Some of the parameters can be measured only by equipment, but most of us, just by our "feeling" and "confort."
I was focusing on the selection of a right frame per the question asked, not on the adjustment or minor components like stems or seat post or crank... These components are way cheaper than the cost of the frame. Your comment is more toward theory than realitic or common practice. Even though we can find two identical persons in sizes of height, arm length, leg length, ..., you name it, the final adjustment to the components (seat post, stem, crank, ....) will still be different. It is because no persons grew the same way internally and physically, e.g., muscle strength, size, length, ... So, it may take quite a while to sense or feel the right setting by ourself.
I rode several years and still have not figured out a perfect setting because I don't know the discomfort from riding is coming from the adjustment or my physical strength. So, I still adjust the components from time to time to "try" to find a proper setting. I guess it will be my life experience to find a good one. Anyway, thanks for your comment, wish we all have good and comfortable rides.
sjjin26 wrote:
不限品牌，限碳纖車架，車架預算約4萬上下，希望大家可以給小弟些意見。...(恕刪)
車架的預算就4萬元, 再加上輪組, 變速器等, 那是一筆很可觀的價格,
您的身高和我一樣
不介意的話是否考慮Merida RB660, 上管50, 立管45,
當做適應公路車的第一步, 而且改裝潛力極大,
可先騎一陣子, 先看看自已是否適應公路車的騎乘
了解自己的真正的需求, 再來看是要改裝或是換車
給您參考一下, 祝騎車愉快!!
我的RB660
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從回答的答案來看, 此人不是一般的凡夫俗子, 應是專業的高知識份子, 可是口氣卻讓人搖頭嘆息
主動觀點：
轉動一定角度，龍頭長則回轉半徑長，騎士的手需位移較多。
被動觀點：
當輪受到側向力（this is a fucking sloppy physical statement made for peons, haha)，如撞到石頭，或反應抽車時的回復力，龍頭會隨之轉動。當此力大小一定時，長龍頭反應到騎士手上的力會較小（力臂長）。
因此，龍頭長則遲鈍（穩），短則敏銳（不穩）。
用「差」或「不差」，「好」或「壞」去描述容易給人錯誤印象。
aquarous wrote:
那下坡車的龍頭那麼短...(恕刪)
龍頭長才不穩，越長越不穩
1. 變長力矩會變大
2. 變長剛性也會變差
01 沒人愛騎車聊天室 http://rollingpotatoes.chatx2.whocares.jp/
aquarous wrote:
你這樣說是因為你試過...(恕刪)
姆，aqua 兄，事實和感受是兩回事，就像用語言中用以為是用眼睛去看(see)，事實上是光射入眼睛(seen)；你以為你踩在地上，事實上是你和地球互拉。
I have tried a 60 cm frame (top tube 57.6cm) with a 11 cm stem (Ritchey WCS 4-Axis) and a 62cm (tb 58.9cm) with 11/12 cm ones. I **FELT** exactly the opposite as you did. To be meticulous, the trail of these 2 framesets was different, yet the same set of stems was used.
If a 11 cm stem suits you, I am happy for you and won't argue it. I replied because your statements were wrong, not how you feel it.
aquarous wrote:
以路面障礙來說，早在30m前就該反應，來不及反應就龍頭擺正直接輾過去，這不是常識嗎？
100%同意aqua兄意見，但偏離「一但輪受側向力」之討論。
aquarous wrote:
以抽車來說，轉龍頭不是很不穩嗎？擺車就好了，幹麼多浪費力氣
haha, you are talking about a perfectly idealized swing in textbook.
請aqua兄仔細觀察一下實際上的「擺車」，再告訴弟龍頭會不會因為前輪為回復偏擺而轉動。go figure.
01 沒人愛騎車聊天室 http://rollingpotatoes.chatx2.whocares.jp/
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