Shimano SLX RD-M670 GS 10 Speed Rear DerailleurShimano SLX RD M670 GS 10 Speed Rear Derailleur Tough, aggressive and light weight Dyna Sys 10 speed SLX rear derailleur using revolutionary features from XT and XTR at an affordable price point. Shimano's 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 chain stays, increase axel sizes and move suspension pivots. Direct Mount gives