It won't fit, get the 30mm one and run 25mm tyres.
Ah, that's a shame, been loving the larger tyres, don't really want to have to spring for new tyres and guards... hmmm, any other guard's you'd recommend to fit?
Problem is that you're stuck, 28mm have very little room for a mudguard in the first place, despite genesis' claim.
@owl started
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It won't fit, get the 30mm one and run 25mm tyres.