[KongchangAI]
Unverified50% confidenceDecision RuleTime unknown

购买前必须确认坐管管径规格,常见27.2mm(细管,多见于钢架/公路)、30.9mm和31.6mm(主流山地/城市车),管径不匹配需配减震夹环,误差超过0.5mm无法安全使用

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