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轮组的重量与性能 [复制链接]

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只看楼主 倒序阅读 楼主  发表于: 2007-11-08
Before you judge a wheel by its weight, there are a few things to consider:

Despite of what you have been led to believe, weight is not everything! It certainly should not be the only thing to consider when making your high-performance wheel purchase. The wheels on your bike will take far more punishment than any other component. Isn't it a good idea, therefore, to make sure that your wheels are one of the most durable components? Also, your wheels are very instrumental in how your energy is transferred into motion.

Consider this: a bottle cage is a bottle cage. OK, there are some bottle cages that are much nicer than others, and that hold the bottles in place better, but, they have one simple task of holding the bottle in place while you ride. They are not effected by the rider's weight, or much by the rider's style. Most importantly, they are not a factor in the transmission of power from the rider to the wheel. Price and performance aside, if you have to choose between a 1 lb. bottle cage, and one that is 10 grams, you are going to choose the one that weighs 10 grams because you know that both are going to do the same job, right?

Unfortunately, the wheels on your bike are effected by the riders weight and style, the type of terrain that you ride on, and other factors. A super light wheel may look good on paper, but under-building a wheel for weight's sake can cause a variety of performance problems, including durability, safety, and efficiency. A light wheel can feel impressive when you pick it up, but how it handles and reacts on your bike may be a different story.

Consider two identical wheels for a road bike: one has the tire inflated to 100psi., and the other has the tire inflated to 25psi. Which wheel will be faster? The one with the 100psi tire, right? Of course. Why? Because the rolling resistance is much lower on the wheel with the 100psi tire. The same thing applies on your automobile- if the tires are under-inflated, your gas-mileage can suffer, and excess heat can build up causing premature wear and possible failure. Heat can only come from energy, so energy is being lost.

The same principles apply to a "spongy" ultra-light-weight wheel. Not only can it be aerodynamically inferior, with its wider frontal area, and a bunch of spokes stirring up the wind like an eggbeater in batter, but the "sponge-like" nature of the wheel can rob you of the energy that you are trying so hard to use for the sake of motion. Energy is being stolen away from you with each little flex of a flimsy wire spoke.

When you bought your frame, you considered its geometry and construction as to how it relates to power transmission. Too soft a frame can be comfortable, but how much of your energy is being lost before it gets to the wheel? How about your wheels? Did you consider how they would perform in the real world, or did you just put them on a scale and count grams?

It all comes down to this: We make high-performance wheels without sacrificing durability, or the safety of the rider. We make aerodynamic superior wheels that are fast. The wheel construction insures low rolling resistance and effective power transmission. They may be a little heavier than some, but are you going to ride them, or weigh them? If you are looking for high-performance wheels, chances are you are going to spend a lot of money. Shouldn't they be durable, low-maintenance, safe, and efficient? If they aren't all of these things, they aren't worth your time or money.

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只看该作者 沙发  发表于: 2007-11-08
在你用重量来判断一个轮组的好坏之前,还有一些东西需要考虑。

不管你之前被什么样的理论影响,重量并不是全部!重量当然不应成为你购买高性能轮组时的唯一指标。你车上的轮子将会承受比其他部件更严酷的考验,所以,确定你的轮组是最耐用的部件之一将是一个好主意。同时,轮组也是决定你的能量如何转变成动力的关键因素。

考虑一下这个例子:水壶架只是水壶架而已。不错,的确有许多比其他水壶架更漂亮并且水壶装得更牢的水壶架,但是它们的唯一功能只是在你骑车的时候装水壶而已。它们不会受到骑手体重的影响,也不会很大程度的受到骑手类型(**注:可能是指公路/山地/铁三之类的类型吧?)的影响。最重要的是它们不会影响骑手的能量传递给轮子。如果不考虑价格和性能,当你在一个1磅的水壶架和一个10克的水壶架之间选择时,你会选择10克的那个,因为你知道它们都能很好的完成装水壶的工作,对吧?

不幸的是,车子上的轮子会受到骑手体重、骑手类型、骑行的地形,以及其他因素的影响。超轻的轮组在纸上看上去很漂亮,但如果真的为了重量的原因编超轻的轮组,会导致多种性能上的问题,包括耐用性、安全性、效率等。超轻轮组在你拎起来的时候会印象深刻,但在你车上使用的时候将会是不一样的感受。

设想有两组一样的轮子在你的公路车上:一组打气到100psi,另一组只打到25psi,哪个会更快?肯定是100psi的那个,对吧?为什么呢?因为在100psi的轮子上滚阻要小得多。同样的例子发生在汽车上:如果汽车轮胎胎压不足,单位油耗会高不少,还会额外的发热导致过早的磨损并有可能发生故障。热量只有可能来自于能量,所以一定有能量被无谓消耗了。

这个道理对刚性不足的超轻轮组同样适用。不光是更宽的截面和象倾斜的直升机桨叶一样扰动气流的辐条造成空气动力性不佳(不知道这句翻译得对不对?),象海绵般软的轮组会吸收你宝贵的用来前进的能量。在柔软的辐条每一次弯曲时你都会失去一部分能量。

当你买车架时你会考虑几何尺寸与结构和能量传递有多大关系。太软的架子会有好的舒适性,但有多少能量会在到达轮子之前就损失掉呢?你的轮组又如何?你是否考虑过它们在现实中的表现?或者你仅仅拿它们放到秤上去称有多少克?(汗死,不会是说我吧?

结论是:我们制造高性能的轮组,不会牺牲耐用性和安全性。我们制造快速的气动性优秀的轮组。轮组的编制保证了低滚阻和高效的能量传递。它们可能比某些其他轮组重一点,但你是准备骑还是准备拿来称分量?如果你正准备找高性能轮组,如果你正准备花很多钱在上面,它们一定需要具备高耐用、低维护、安全、高效的特性。 如果它们不全部具备以上特性,它们不值得你花时间和金钱。

靠,说了半天没说到什么深刻的东西啊,而且貌似还是个奸商写的枪文。。。
1条评分
李先败 威望 +10 辛苦啦~~~~! 2007-11-08
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77bike黄浦店:上海黄浦区南塘浜路125弄4号(老年大学往西10米)
77bike嘉定店:上海嘉定区江桥镇金园一路1398号(嘉璞轩酒店底商)
主营品牌:大行DAHON,风行fnhon,鸟车Birdy,RUHM小布,燕鸥Tern,锐骑REACH,星期五bikefriday。
超高性价比风行FGC1611蚂蚁腿,便携和性能完美结合!https://item.taobao.com/item.htm?id=682335849902
New Birdy全新3代鸟车,200多项改进!https://item.taobao.com/item.htm?id=522963475502

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只看该作者 板凳  发表于: 2007-11-09
总算看懂了色教授的一篇文章,还是色教授厉害,哈哈~~!谢谢**~~~~!

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只看该作者 地板  发表于: 2007-11-09
哈哈哈哈哈哈

这是Areospoke官方网站技术版的一段文字。

这可不算是枪文,这讲的就是rolf这种轮组编法的刚性问题,而刚性会影响效率。难怪AM7采用的编法就是看上去很平凡的拉法。


前后共974g的AM7,tyrell的高档轮组 。

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只看该作者 4楼 发表于: 2007-11-09
黄婆卖瓜自家好,谁都会说自己的东西好。做为折叠还是没办法跟赛场

运动车比的。本来折叠的定位就与运动车不同,如果非要追求完美性能

不如直接用赛场运动车了,折叠就是方便、便携和兼顾一定的有限性能,

非要用来跟运动车比那就强人所难啦,也没这个必要。世上本就没完美

之物,折叠是用来玩玩,没必要过于认真,自己高兴能换来个好心情就

可以啦!
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只看该作者 5楼 发表于: 2007-11-09
折叠个拉风的轮组就好了

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只看该作者 6楼 发表于: 2007-11-09
的确重量轻的容易出问题,我80公斤用24根辐条的后轮组,入秋冬以来连续断了3根辐条。
neo
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只看该作者 7楼 发表于: 2007-11-09
说了一堆,就是轻的轮子不一定好。。。。。

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只看该作者 8楼 发表于: 2007-11-09
rolf所有的高端竞赛用公路轮组都是星形编法,dura ace 7700轮组也是星形,都是有口皆碑的好东西啊
77bike淘宝店:http://77bike.taobao.com
77bike杨浦店:上海杨浦区邯郸路170号(复旦大学正门往西350米)
77bike黄浦店:上海黄浦区南塘浜路125弄4号(老年大学往西10米)
77bike嘉定店:上海嘉定区江桥镇金园一路1398号(嘉璞轩酒店底商)
主营品牌:大行DAHON,风行fnhon,鸟车Birdy,RUHM小布,燕鸥Tern,锐骑REACH,星期五bikefriday。
超高性价比风行FGC1611蚂蚁腿,便携和性能完美结合!https://item.taobao.com/item.htm?id=682335849902
New Birdy全新3代鸟车,200多项改进!https://item.taobao.com/item.htm?id=522963475502
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只看该作者 9楼 发表于: 2007-11-10
听过合力兄弟在杭州开的一个说明会,其中马威克 的轮组 占了重头。确定有很多先进的加工工艺和设计理念在产品中,有的轮组甚至能在骑行中由技师根据车手要求来调节顺畅度。但最后的结论是:竞技产品不适用于一般的骑行活动和训练中。能保证的就是比赛时的最佳性能......
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只看该作者 10楼 发表于: 2007-11-10
同意先败兄,感觉折叠车厂商按国内的现状和消费情况近几年不太会往性能车(performance bike)的方向上走,因为折叠有它的先天特点或者说是弱点,一定要性能的车友特别要注意车辆本身的极限。

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只看该作者 11楼 发表于: 2007-11-11
是呀,折叠车性能终归不可能象公路车那样的
77bike淘宝店:http://77bike.taobao.com
77bike杨浦店:上海杨浦区邯郸路170号(复旦大学正门往西350米)
77bike黄浦店:上海黄浦区南塘浜路125弄4号(老年大学往西10米)
77bike嘉定店:上海嘉定区江桥镇金园一路1398号(嘉璞轩酒店底商)
主营品牌:大行DAHON,风行fnhon,鸟车Birdy,RUHM小布,燕鸥Tern,锐骑REACH,星期五bikefriday。
超高性价比风行FGC1611蚂蚁腿,便携和性能完美结合!https://item.taobao.com/item.htm?id=682335849902
New Birdy全新3代鸟车,200多项改进!https://item.taobao.com/item.htm?id=522963475502
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只看该作者 12楼 发表于: 2007-11-11
引用第11楼azuretears于2007-11-11 00:54发表的  :
是呀,折叠车性能终归不可能象公路车那样的

还有山地