That computes to be exactly what it is. 204mm vertical vs. 230mm along the axis of the fork given the 27.5 degree rake angle.My guess is that it's the difference measured along the fork (more practical) and measured vertically. If you know the rake of the forks you can work it out with a bit of simple trigonometry. I had the same dilemma with the NC750X in that the service manual was quoting 137mm and everywhere else it was 150mm. When you take the 27 degree rake into account both measurements were the same. For what it's worth I think Honda generally quote vertical axle travel front and back and when they don't, they describe it as 'cushion stroke' - but in truth I don't think they are consistent.