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The Acerbis 2.0 Chain Guide Block easily replaces the entire O.E.M. unit and ensures durability and high resistance to shock and wear from the chain. Made of PA6, it is made of two parts that allow installation without removing the chain.The guide is made in two pieces: the body and the slide, the latter replaceable once worn, also allowing you not to have to disassemble the chain when replacing the slide or the guide itself. The controlled elasticity structure of the guide absorbs shocks and minimises damage to the chain and crown.  FEATURES 100% PA6 Construction. Highly resistant to shock and chain wear. Made of two pieces, allowing it to be mounted without removing the chain. In the event of collision or contact with roost, PA6 Material wont bend.  Weight: 200 grams. Replaceable Inserts also Available. Part Sold Separately. VIEW MOUNTING INSTRUCTIONS BIKE FITMENT YAMAHA WR250F 2025 WR450F 2024-2025 YZ250F 2024-2025 YZ250FX 2025 YZ450F 2023-2025 YZ450FX 2025