haha the maths indeed are ropey, thats what happens when you post the minute you get up.
OK heres some accurate measurements:
headset face to face = 140.24mm
Stem height = 40.6mm
Assuming that the crown race pulls up when assembled so its flush with the outer face of the lower headset that would be a total height of 180.84mm or 181mm
The centre point of the top cap screw is 6.48mm from the top face of the stem so that would mean that only half of it would be clamping onto the steerer.
I think that make sense?
So, its actually going to be more like 6mm short of the top of the stem isn’t it?
Any recommendations of a quality stem with a shorter stack height for XC ?
Or even a one with a better clamping option to make up for the shortfall of steerer length. Keep your eye on the classifieds as i’ll flog the 0 x 70mm Thomson !