Rd-m665 are designed specifically for mountain bike compact group sets.All mountain compact drive:compact cage design:matched radius reduces chain drop:wider chain stay angle:improved suspension compatablity (65-71')
Specifications.
Swing action-top swing.
Cassette compatablity-9 speed
Max capacity-14t
Top gear-36t
Cable routing-dual pull type
Chain line-48.8 mm
Chain stay angle65-71'
Multi clamp