Rear Mechs

[Mod-Master]

XTR RD-M950 SRP hanger and Dura Ace 7700 cage ~201g

 

[JayLC]

Dura-Ace 9100 - Weighed at 159g. Shimano claim 158g

 

[Mod-Master]

Shimano XT M735 SGS weighed at 258g with SRP hanger bolt, saves approximately 8g

 

[M_YBB]

Paul Components rear derailleur weighed at 191g