Is that actually a leaking rear/final drive, or is that just spline grease? Mine looks not dissimilar and isn't leaking any fluid.Yes it is a leaking rear drive. I had used some red gear oil last fill. You could see a puddle of the red oil inside the rear drive. I had cleaned the rim off once alreadyy and waht you see is from a 30 mile ride. Way to much for just spline grease. Anyway I swapped in the rear drive from my 09 and all is well now. Wheel is clean after 60 mile ride yesterday.
EDIT: I just looked and I don't have all the spots around the outside of the rim, just the streaky hub.