神秘的慣性 - 公路車
By Jake
at 2015-05-25T06:46
at 2015-05-25T06:46
Table of Contents
在台灣 沒聽過這個名詞別說你騎過公路車!
車店老闆常會跟你介紹 這個輪組的慣性很好 高速很省力之類的
我想大家也有同樣經驗 甚至聽信老闆的建議 買了所謂慣性輪組
但真的好騎嗎?心裡沒有疑惑嗎?騎了不覺得沒想像中好騎嗎?
讓我們複習一下牛頓第一運動定律:
除非有外力施加,物體的運動速度不會改變。
根據這定律,假設沒有任何外力施加或所施加的外力之和為零,
則運動中物體總保持勻速直線運動狀態,靜止物體總保持靜止狀態。
物體所顯示出的維持運動狀態不變的這性質稱為慣性。
所以,這定律又稱為慣性定律。物體的慣性與其質量有關。
以上來自維基百科 偉大的牛頓告訴我們 物體的慣性與其質量有關
要將一個重的東西推至50公里 要比推一個輕的費力 這我小學就知道了
要將重的東西從50公里減到0 要比輕的困難且費力 這我國中就知道了
我相信各位跟我一樣 國中之前就明白這些道理
那麼 我們為什麼還會相信車店老闆的鬼話呢?
1.老闆說:這輪組慣性很好
他沒告訴你的是,這輪子很重
2.老闆說:這輪子高速很容易維持,
他沒告訴你的是,這輪子很難加速到高速
3.老闆說:高速時不用出甚麼力
他沒告訴你的是,在高速前你要很費力
老闆並沒有騙你 只是解釋方式不同 高明的話術 輕易的掏空我們的荷包
於是 在台灣車多擁擠的環境下 當我們費力的將速度踩到40km
紅燈一亮 不好意思喔 砍掉重練
綠燈亮了 你再次加速到40km 無情的紅燈又再次亮起...
體力就在這麼一來一往間悄悄流失 冷水煮青蛙 我們就是那青蛙...
兩個人的MP如果是999 加速到40km是大絕招 輕輪組放一次扣40MP
重輪組放一次扣50MP 每次起步 重的輪組就多扣了10MP
停十次紅燈你就比人家多扣100MP 更別說偶一為之的爆氣再加速攻擊了
那慣性輪組真的沒用嗎?俗話說 天生我材必有用!
慣性輪組是要看場合使用的 老闆說過 重的輪組在高速維持上比較容易
我們把場景拉到個人計時賽 在平地佔大多數的ITT 沒有隊友 沒有障礙
選手一切只能靠自己 所以會選擇風阻小 重量高的碟輪或是超高框板輪
目的是希望速度拉起來後 高速的維持比較省力 反正又不用停紅綠燈
這種非現實的場合 才是所謂慣性輪組適用的場合跟存在的意義
否則一般有爬坡的公路賽 有看過誰騎碟輪或超高框的嗎?
對手在上坡隨便攻擊個幾下你就開掉了
在台灣 大概只有西濱或少數道路比較符合這種條件
重的輪組用在這種場合 的確會比輕的來的容易維持速度
輕的輪組也不是不好用 只是同樣的速度同時停止踩踏 輕的比較容易失速
但要再加速回40km 輕的輪組同樣也比較容易
如果是團隊北高 我會選擇越輕越好 平時可以輪車 面對攻擊時反應又快速
如果是獨推北高 我會選擇C50 CL 在穩定的速度下節省一些體力
最後 談到爬坡 有的老闆會告訴你 這輪組慣性好 爬坡也輕鬆
這我就沒辦法替老闆講話了 爬坡還靠慣性? 慣你一拳比較快
反正甚麼光怪陸離的鬼話都有人講 行銷果然是門學問!
透過言語的包裝 能夠讓一組2~3千塊成本的輪組 身價暴漲好幾倍
這種現象屢見不鮮 無怪乎台灣的鋁框牌子那麼多 好賺嘛!
再把牛頓搬出來吧:
牛頓第二運動定律 說明了物體的加速度與物體所受的凈力成正比
並和物體的質量成反比。而物體加速度的方向與凈力的方向相同。
牛頓第二定律通常表達為:F=ma
同樣來自維基百科
好吧 我承認 其實牛頓在講甚麼我也不是那麼清楚...
到底引用的對不對也不是那麼重要 純粹只是覺得看起來很厲害XD
爬坡是對抗地心引力的動作 輪組越輕 費的力越少
輪組越重 自然就比較費力 既然如此 爬坡你還談甚麼慣性?
如果在坡中能維持30-40km 那談慣性絕對沒有問題 若只有10-15km
那麼你覺得慣性重要 還是重量重要?
(這個部分有一個前提 要假設輪組的剛性 花鼓的驅動力...不會差太多
要知道 剛性足以影響輸出 花鼓更是門學問 耳距 鋼絲張力 偏心框
編法...甚至車手的重量都足以影響輪組的調性 有機會再談)
但是我們要考慮一個重點 輕的鋁框是否能兼具剛性?
市面上不乏便宜的13XXg甚至12xxg台製雜牌芭樂輪
B家花鼓 C家鋼絲 XR鋁框 配上無知觀念跟兩光編輪 佐以神奇文字
一組賣你一萬元 你還感動的痛哭流涕 這價格這重量 以為老闆佛心來的
殊不知此佛非彼佛 乃是佛地魔來著...
好騎嗎?好難騎喔...踩下去軟趴趴會吃掉你的力量 剛性不足的印證
不是說越輕越好嗎? 前面有提到 在剛性足夠的前提下 重量是越輕越好
鋁框也可以做到12xxg又兼具剛性 但所花的價格你能接受嗎?
DT180花鼓 Ambrosio特製鋁框 DT aerolite
鋁頭防鬆膠那些有的沒的哩哩扣扣都算我沙秘斯的
大概花個5萬塊應該編得起來...與其如此 不如選擇大廠廠輪
重量略重(1400g左右) 但經過計算跟設計 也有實際驗證 可靠度好很多
CP值高的手編輪也不錯 但請慎選編輪者 觀念好 技術佳 價格公道
符合這條件的就那幾個 自己有在騎車的那就又更少了 有能力上凸台的...
這樣算置入性行銷嗎?XD
最後 現今的比賽 為何多選擇中高框的碳框 而不選擇甚麼爬坡鋁框呢?
1.重量輕 2.剛性好 3.風阻低 4.看起來比較殺(誤
別再跟我說甚麼SL比7850 TU還好爬坡了 我只有一個想法 大人巴小孩
我願意用你口中比較好的SL貼你5000換你的7850 TU 真的!
今天結束的環義stage15高山站 前三名一樣是用中高框的碳框爬坡
我不是說鋁框不好 而是相較之下 碳框的表現更棒 當然價錢也更高
如何取捨 端看個人 我有鋁框也有碳框 看甚麼場合用甚麼框
但是不管甚麼框 上述觀念都是相通的
我不相信偉大的老闆或任何人能夠挑戰牛先生的兩個定律
一些不合時宜的舊觀念 就讓它停留在過去吧 愛殺豬公的就繼續吧
以上純為個人觀點 批評指教 理性討論歡迎! 無理鬧場 屁孩酸民退散!
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