Shimano slx m670 shadow 10 speed rear mechtough aggressive and light weight dyna sys 10 speed slx rear derailleur using revolutionary features from xt and xtr at an affordable price point shimanos new direct mount rear derailleur system gives more space around the rear frame dropout resulting in easier rear wheel removal but also allows frame designers to shorten chainstays increase axel sizes and move suspension pivots features direct mount gives a simpler cleaner look shadow features a s