Shadow Plus technology keeps the low profile shape reducing chainstay and other contact, and adds a chain tensioning device reducing noise and dropped chains
Compatible with Dyna-Sys 10 speed Shimano products
Aluminum construction with sealed bearing pulleys
4 fluoric coated link pivot bushings for smooth operation
Shimano Reference Number: RD-M640

Technical Details

Product Details

Product Dimensions

Package Dimensions
Width : 1 inch
Height : 1 inch
Length : 1 inch

Item Weight: 15.2 ounce (View shipping rates and policies)
Shipping Weight: 1 pounds (View shipping rates and policies)

ASIN : B007Q4P7UQ