The Sunrace SP856 11 v. rear derailleur caster set is an essential accessory for your bike. Manufactured by the renowned Sunrace brand, these two wheels are designed to provide optimum performance for your rear derailleur system. Featuring 11 plastic teeth, these wheels are specially designed for bikes with 9, 10 or 11-speed drivetrains. Thanks to these optimally sized teeth, you'll enjoy smooth, precise shifting, for a smooth riding experience. To ensure maximum durability, the derailleur wheels are fitted with sealed cartridge bearings. These bearings ensure smooth, long-lasting rotation of the wheels, reducing friction and preserving your drivetrain's performance. The Sunrace SP856 11 v. rear derailleur caster set is easy to install on your existing derailleur. Simply remove the old wheels and replace them with these new, high-quality wheels. With their elegant design and reliable operation, these wheels will add a touch of performance to your bike. Whether you're an amateur cyclist...