Force 1 Rear Derailer - Short or Medium Cage?

[JulienR]

I have a force 1 Rear deraileur (11 speed). I think its a medium cage but am not sure. I am planning a 1x build but dont want to invest in the rest of the Force kit until i am sure...

The internet is helpful but not that helpful - there is no definitive model number on the deraileur and there is no indication of what a medium cage length should be. 

 

I have attached some pics and also measured that the space between the two pulleys is 60mm

 

Any help / advice would be helpful

[TomR]

That definitely looks like a short cage.
 

I was an early adopter of the Force1 groupset and had a similar issue with the rear derailleur working with the cassette that I wanted. It’s quite easy just to change the cage. I used an XX1 derailleur cage to extend the range on my Force derailleur. I believe any Sram 11 speed MTB derailleur cage should work. These cages aren’t too hard to come by and you’d be able to convert from a short cage to long cage. 

[JulienR]

Thanks for the feedback. Will see if i can get a longer cage and swop