推荐回答(4个)
是这样:
1,24速和21速的区别,在于传动比。因为牙盘是42-34-22(类似的齿数,型号不一样,有些小差别),飞轮七片的从27(28)到12(11)降下来,八速的也是一样,变化的差值小些。
21速的车,有可能你在某个时段,前1档后4档很累,后5档有觉得发力不够;换成24速的车,可能前1档后4档正好。也就是说,24速的,能够更细腻的来适应你的骑行,适合更多种路况,和体能状态。
2,6系和7系列,不仅仅是变速的这点变化,比如7系的车架已经很“入门”了,以后想升级的话,也会比较方便,就好像买电脑,买了一个好的主板,以后换零件、更新配件都很好。
3,速度方面,6系的车可能最小片都是12的吧,印象上7系的后面最小片是11.有点细微的差别,但是有些朋友赶紧差距很大。但是很难有人能最大传动比,长期骑上一两个小时的,毕竟很费体力,尤其山路。
总结:如果你只是买来随便玩一玩,670都足够了,至少样子还比680好看点,尽管不是快拆的轮组。如果你想以后经常跟朋友出去郊游,甚至略微长途点的旅行,建议从750甚至790入手,不推荐770-D那个档次的碟刹车。抵挡的碟刹还不如好一些的V刹。
骑山地车本来速度就超不过公路车,喜欢速度请OCR。
另外我本人是770,2009款的,在北京的垃圾路况下一般是胡同用2,7。马路用3,7
除非路况极佳或者彪速度,不然不用3,8.
21S和27S区别在于最高速,爬坡的话一般不会用到高档位。楼上说得对,山地车最大的乐趣就是越野的感觉。7系车肯定要比6系好,而且7系算入门车,6系不能算严格意义的山地车,算是娱乐山地车(捷安特官网分类)。6系速度肯定比不过7系了,而且飞轮、变速的区别你骑过也就知道了。如果觉得贵,买个740也好额
速度都是一样的,主要的差别都在细节上。你要速度快就要技术够硬。个人认为ATX690是最理想的。
其实24S与21S的差别并不是在爬坡上,真正爬坡时用不上最高档速的,27S也是如此,档速越高力道就需要越重。在爬坡是根本不需要这么高的档速。而LZ说的最大速度比值的话要看LZ自己,因为根据我的理解真正快的人骑得快的原因不在于档速上的差别,而在于对变速上使用熟练程度。并不是所谓的档速越高就越快。在骑车时低档起速,例如前二后6的样子,在速度提上去的时候档速慢慢加上去。我的车是27S的,但是我很少将变速调到8.9速,山地车的乐趣在于什么?在于山水之间,作为山地车,最大的乐趣莫过于穿越在丛林之间了,但是要有真正的快感,请选择7系的车子吧。相信LZ在山路上穿越的同时体会到快乐。
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