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Shimano Ct-s500 Alfine Chain Tensioner - Chain Guide Ct-s510 - Chain Guide - Black / Silver - Bicycle Derailleur - AliExpress
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Amazon.com : SHIMANO CT-S500L Alfine Vertical Chain Tensioner (Black) : Bike Chain Tension Idlers : Sports & Outdoors
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András Gercsényi XC Mountain Biker: Shimano Alfine chain tensioner on a single speed XC mountain bike // First impressions
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