滾動速度（推桿）
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定義
- 球開始滾動時的速度（當表面周速與前進速度相等時）。
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滾動速度的用途
- 將滾動速度與球速和Speed Drop結合觀察很有幫助，因為它衡量的是球在初始滑動階段之後的球速。
- 因此，應將滾動速度與球速結合評估，以更好地評估球在滑動階段損失了多少速度。
產品類別
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