12T 14T 16T Bicycle Ceramic Bearing Jockey Wheel MTB Road Bike Rear Derailleur Guide Pulley Cycling Replacement Parts

About ExplainAttention: Before Purchasing, Please Confirm If The Product Is Compatible. If You Are Unsure, Please Contact Our Customer Service. Thank You For Your Understanding!Status: 100% Brand New Color: Black, Red, Gold, Green, BlueProduct Usage:Replace bicycle rear derailleur pulley, reduce friction, improve shifting smoothness and cycling efficiency, prevent chain dropMaterial: 7075 Aluminum Alloy + Ceramic Bearing + Stainless Steel Shell + Copper BushingSending packages includes: 1 x Rear Derailleur Pulley, 2 x Copper Adapters (4mm, 5mm)Kind reminder: Our store does not accept malicious negative reviews of product issues caused by personal negligence or errors of buyers! Customers who have repeatedly given malicious negative reviews and engaged in inappropriate behavior will have their purchases restricted!!! Note: Due to manual measurement and display issues, please allow for errors in product size and color. Thank you very much for your understanding! ！！！If you are satisfied with the product, please leave us a 5-star praise.Follow the store, you can receive fan special coupons, come to follow the store！！！Notice (Additional Notes):Please confirm the required tooth count (12T/14T/16T) and screw axis size (4mm/5mm/6mm) before ordering.Check your derailleur compatibility – this pulley fits most standard rear derailleurs.Installation requires basic tools (hex key – not included). Apply light grease if needed.Ensure the pulley is properly aligned and securely tightened after installation.Avoid over-tightening – may damage the bearing or derailleur.Slight color difference may exist due to different display screens or batch variations.Keep away from children – small parts may pose choking risk.Contact customer service first for any product issues instead of direct negative feedback. Thanks for understanding.1>Stainless Steel Shell ,more durable , compared with nylon shell ,  nylon shell is easy to break after 100 miles travel2>Narrow Wide Teeth Design, Prevent the horizontal swing of the chain3>Copper Bushing ,High Hardness ,Improve Life Time16T For(1) Shimano 8800RD--6800 6870/6770/9000/9070,  (2) Shimano 8700RD--5800/5700/4600/4700/105/6600,(3) Shimano RD--R8000 etc.,18T For Shimano R7000/R8000/R8050/R8070/R9170/R9150/R9100 etc.,