A slightly different set up on my MC21 Track Bike (RVF forks), but purely as an example......when I bought an NF5 Magtek 3" Front Rim, it required a spacer machining to line up the wheel correctly.




But your rim almost looks too wide for the forks, with not enough clearance on either side, even if the wheel was centred??
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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30