Sealed Bearing Bike Rear Derailleur Pulley - Ceramic Mountain Bike Transmission Upgrade

Ready to upgrade your bike's performance? These sealed bearing rear derailleur pulleys are game-changers for your mountain bike's transmission system. They come in two types - 11T (about 41mm/1.6in) and 13T (about 49mm/1.9in) - with colorful aluminum alloy construction that's both lightweight and durable. Here's the cool part: they work with 4mm, 5mm, or 6mm axle screws thanks to the included sleeve system. Just remove the sleeve if you need a larger size! Pro tip: always choose the same size as your original pulley, or go slightly smaller if exact match isn't available. These ceramic bearings reduce friction significantly, making your shifts smoother and pedaling more efficient. Perfect for trail riders and cycling enthusiasts looking for that extra edge in their gear performance.