Six dimensions are: speed class factor, special starting class factor, the maximum strength class factor, quick power class, body shape class of factors, physical function category factor.

六个层面是：平跑速度类因子、专项起跑类因子、最大力量类因子、快速力量类因子、身体形态类因子、身体机能类因子。

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At 50lbs (23kgs) the Turbo is not the lightest bike in the Specialized line, but it's arguably the lightest in its speed class.

ENGADGET: Specialized Turbo e-bike reaches the US, offers a speed boost for $5,900

The highest speed class available today, the UltimateXX meets standards set by the Secure Digital Association for next-level performance in SD card technology.

ENGADGET: Kingston launches USB 3.0 roadmap, SDHC UHS-I UltimateXX card

Some users claim that the Class 4 SD cards (4 denotes the speed class rating) are more vulnerable to problems, and that upgrading to a Class 6 card fixed that.

FORBES: Is Your Android Smartphone's SD Card Causing It to Crash or Lose Data?