The Shimano Altus RD-M310 Rear Derailleur is designed for 7 and 8-speed drivetrains, delivering smooth and reliable shifting. With a 13t upper and 15t lower pulley, it ensures durability and performance. The derailleur supports a maximum cog size of 34t and a total capacity of 43t, offering excellent gear range compatibility. Ideal for both casual and serious cyclists, it’s easy to install and provides consistent performance in various riding conditions.