But thats from 1.5" to 1 1/8? I would need one from 40mm to 30mm
Same thing. 1⅛" headset bearings are 30mm ID, 1½" headset bearings are 40mm ID
You can also use a ZS44/30 lower to fit a 1⅛" fork in a 44mm ID head tube, it alters the geometry a bit compared with EC44, but if your frame was always supposed to have a straight steerer, the geometry may already be set up for a ZS lower.
It isnt clear whether that frame geometry is designed for an EC or ZS lower cup. Geometry drawing suggests ZS lower, but all google images show it with an EC lower. Think I would want to clarify that with Veloci Cycle, and fit whichever lower cup they recommend.
Same thing. 1⅛" headset bearings are 30mm ID, 1½" headset bearings are 40mm ID
You can also use a ZS44/30 lower to fit a 1⅛" fork in a 44mm ID head tube, it alters the geometry a bit compared with EC44, but if your frame was always supposed to have a straight steerer, the geometry may already be set up for a ZS lower.