登山車改700c輪組請益 - 公路車
By Bennie
at 2014-05-26T19:02
at 2014-05-26T19:02
Table of Contents
→ minghanwu :補充一句,如果改個輪組直徑幾何就會跑掉,那麼換不 05/26 16:41
→ minghanwu :同行程的避震前叉,那還得了,對吧 05/26 16:42
有種詞叫做預期的用途(intended use)
車架在設計時,就會依照用途,建議適合的前叉長度範圍
如果有人想的話,當然可以把雙肩前叉魔改到XC車上
但是一台XC車不管怎麼改都不會變成DH車,因為原先設計時就不是騎DH用的
車架幾何有很大的學問,不然也不會有那麼多的廠商,想賣你各種不同的幾何
設計29"車架並不單純只是把每根管子都變長一點,讓車架可以塞29"輪組
輪徑變了,操控性就會變,課題就是讓大輪子騎起來有小輪子的感覺
改變避震行程、頭管角度、chainstay、wheelbase,都是牽一髮動全身的
我也不了解國外一些吵chainstay要多短才完美、頭管差一度差很多到底在爭什麼
但是試車會有「這台車真活潑」「這台車很穩」,就是幾何對騎感的影響
當然這些主要是對off-road激烈操駕時影響較大
而我沒搞錯的話,登山車好像可以騎off-road呢!Surprise, surprise.
回到intended use。一台26"的車,設計上就是裝26"輪組用的
硬改上29"(700c)輪組就不是原本設計的用途,同時也不能夠保證車架結構的完整性
同一個車架裝不同大小的輪子,車架的受力就不同
應力累積在車架不對的地方,造成金屬疲勞,損壞的機會就變大了
這也是為什麼我一開始就回說,想騎700c請買公路車
喜歡登山車有避震的話也可以買29er改細胎
為什麼要冒著受傷的風險硬上29"輪組,我實在不了解
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