rear shock

I tried to find this and couldn’t so here goes. My 91 bmw r100rt needs a new rear shock. The one on it has what looks like a air shock ( but isn’t) with a resivior on the right side. As you can tell I’ve no experience with shocks so I need some advice. Could someone explain what this does? I...

Pulled my baby out of the shed yesterday, started right up. Immedidately started dripping oil. It is coming from the rear shock. I read on some forums that this is common after sitting for long periods of time, in the cold. I am looking to replace the shock. I see there is a Wilbers shock...

77 R100s rear shock relacement....I thought this was supposed to be easy... All i wanted to do was change out the rear shocks of my 77 R100s and after getting the right side done i started the left and found that the bolt holding the bottom of the rear shock was put in from the inside out...

Has anyone replaced the OEM shock with an Ohlins on a F800ST? Has anyone had this done at the rally? If so, what sort of cost was involved for parts and labour? I am considering this for Redmond. Cheers!