[kma]

I need help identifying if I have a short or mid/long Ultegra rear derailleur. The only identification on the back says RD-6800. There's no SS or GS markings. Thanks in advance for your help!

 

[202cycle]

a photo of the derailleur would be helpful, otherwise, it's just speculation.

 

[tlg]

It should be pretty obvious. On the SS the pulleys are practically right on top of each other. On the GS there's more than a pulley diameter of space between the pulleys.

 

[kma]

a photo of the derailleur would be helpful, otherwise, it's just speculation.

Here's a pic. 2.25" between each pulley

 

[nhluhr]

Here's a pic. 2.25" between each pulley

That is definitely the SS derailleur. The GS will have closer to 3 1/4" pulley spindle spacing.