[KongchangAI]
Unverified88% confidenceTradeoffTime unknown

变速套件档次(105→Ultegra→Dura-Ace)每升一级重量减约200-300g但价格翻倍,业余骑行Shimano 105 R7000/R7100级别性能与减重已足够,Ultegra以上属于边际收益递减

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