Interesting info. From where did the weights come?
HP2 has an air shock, that's why it's so light. R11GS, you have to remember that the shock contributes less to the unsprung weight than the others do due to its location.
The Akront rear rims actually aren't that heavy. I was very surprised. The hub is heavy. I have not disassembled a front so I don't have experience there, but I do have a G/S front hub lying around that I could weigh.