Yeah centre to centre. NS Bikes must measure from bottom of tube to the top of the rise. Therefore making these 3" but smaller if measured the same as Bada Bings, and compared to them too. I'll measure them some time to see from bottom of tube to top of rise, and the centre.
Rode some trails today, takes a bit to get used to how light it is! Felt unco as cause it's soooo poppy, got it under control eventually though, absolutely love it !