hi, the 1,5 " ist too big, maybe it uses 1 1/4 " bearings
canyon seem to use these measurements for the Lower Bearing (AC3344)
( info from https://www.totalcycling.com/de/Acros-Canyon-Aeroad-CF-SLX-Headset-Bearings/m-23004.aspx )
Inner x Outer x Depth (mm): 33 x 44 x 6
Angle / Chamfer (Deg): 36/45
wich can be bought e.g. here: https://www.kugellager-shop.net/acb3344h6-36-45-44x33x6mm.html
but to be more sure, you should search the exact frame model+year this fork stems from.
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