Iíve got a vivid 5.1 for my ride and Iím after changing the shim stack from tune B to tune A.

Now hereís where im getting confused.. Iím pritty sure its part number 11.4115.080.010 on page 80 of this document as its a low tune...

http://cdn.sram.com/cdn/farfuture/AD..._spc_rev_c.pdf

But it says its for the R2C model? Is the vivid 5.1 and the R2C the same shock? Iím quite sure mines a 2011 model...

Any help to clear my confused head would be greatly appreciated!