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Power Cranks – Shimano 105 Upgrade Kit

Power Cranks – Shimano 105 Upgrade Kit

Part No. 48119-2112

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Whether you're looking to take your training to the next level or you simply want a better way to measure energy expenditure, a power meter is your best bet. And the Power Cranks 105 Upgrade Kit are no exception. With our lightweight power sensor on a Shimano 105 crankarm, it's the perfect way to enter the power meter game.

The development of Power Cranks began with our Human Performance Team looking at riders in realistic scenarios on the bike. Historically, power meters have been validated by two different methods—one is by measuring the produced torque by applying a static, linear load to a crankarm or chainring, while the second uses a power generating motor to pedal the bike. Well, cycling is neither static nor linear, and humans apply power much differently than a machine. So, we found that neither of these methods answer the real-world accuracy question.

To get the best test for accuracy, in all types of riding scenarios, we built our own cycling treadmill, the WinMill, to measure power output to a known truth. This new benchmark lets us evaluate accuracy under all riding conditions—seated versus standing, various power and cadence levels, different weights, and a myriad of gear. This data acquisition process is our gold-standard for testing power meters, and through our testing and external validation from the Locomotion lab in Boulder, Colorado, Power Cranks have been proven to have the highest accuracy in real world scenarios (+/- 1.5%).

The Power Cranks are also easy to live with, with class-leading temperature compensation firmware and waterproof enclosures. Calibration is only required during seasonal-type fluctuations in temperature, and the included wrench makes battery swaps a breeze.

不管您是想要把自己的训练提升到下一个档次还是简单地想以更好的方式来测量能量输出,功率计都是上佳的选择。而我们的105升级功率曲柄也是一样。我们轻盈的功率传感器加上Shimano 105曲柄,帮您打开进入功率计世界的大门。

功率曲柄的研发从我们的运动表现团队在现实场景中观测骑士开始。一直以来,功率计一般通过两种不同的方法进行验证,一种是通过测量应用于曲柄或者齿盘的静态的线性负载,以测算产生的扭矩,而第二种则使用自行车驱动发电马达。但是骑行既不是静止的,也不是线性的,人类的力量输出与机器的差别很大。因此我们发现这些方法都不能解决现实中的准确性问题。

为了在各种骑行场景中获得我们想要的测试精度,我们打造了自己的自行车跑步机,并称之为WinMill。以此测量真实的功率输出。这个新的基准让我们得以评估在各种骑行条件下的准确性——坐姿与站姿,各种力量和踏频,不同的重量,和各种齿比。这个数据采集过程是我们测试功率计的黄金标准,通过我们在科罗拉多州博尔德的运动实验室进行的测试和外部验证,证明了功率曲柄在现实世界的场景中具有很高的精确度 (+/-1.5%)。

使用一流的温度补偿固件和防水外壳,这款功率曲柄使用维护都很容易。校准只需要在季节性的温度波动时执行。附赠的扳手让更换电池也轻松而愉快。