Takk for hjelpen folkens.
I mellomtiden fant jeg dette:
Note: the GC 42 is not compatible with 2011 or older SRAM rear derailleurs due to the location of the upper jockey wheel. It is difficult or impossible to get satisfactory shifting with the 2011 or older SRAM rear derailleurs so we do not recommend using the GC 42 if you have one of these. The GC 42 works great with the newer SRAM rear derailleurs however.
her:
http://www.wolftoothcycling.com/products/giant-cog-for-shimanoGreit å vite at det ikke bare var meg som var klønete.
Ny bakskifter er på vei fra Sykkelkomponenter og RadCage + 16t er bestilt på OneUP