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@Dammit
Ok, the SystemSix fork was 1gram lighter than the SuperSix fork, however it would appear that the SuperSix fork is comprised of a lot more actual material.
Where the SuperSix uses a very long topcap to reinforce the inside of the steerer, the SuperSix has a much thicker walled steerer- so thick that the internal diameter is too small to use the Hope Head Doctor I bought for the purpose.