[KongchangAI]
Unverified85% confidenceDecision RuleTime unknown

选购前测量车架管径:公路车上管多为25-32mm,山地车下管可达35-45mm,绑带有效缠绕长度需≥管径周长的2.5倍才能可靠固定,胖胎车/电助力车管径粗需选加长款(≥40cm)

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