Not sure what you mean by a dimple - I know some mudguards have a little indent to clear the fork blades but these Chromoplastics don't, so it doesn't matter whether they're mounted to the front or the rear (apart from the latter providing slightly better coverage, with the mudflap lower).
Only reason I've mounted the bracket in front of the fork is that it's a modern recessed nut type of brake, with a short mounting bolt that doesn't protrude from the fork crown at the rear. To mount it from behind I'd need washers with an internal diameter large enough to clear the long mounting bolt and an external diameter small enough to fit in the recess in the back of the crown. Or a different mounting bolt. This was the easiest way by far.
Not sure what you mean by a dimple - I know some mudguards have a little indent to clear the fork blades but these Chromoplastics don't, so it doesn't matter whether they're mounted to the front or the rear (apart from the latter providing slightly better coverage, with the mudflap lower).
Only reason I've mounted the bracket in front of the fork is that it's a modern recessed nut type of brake, with a short mounting bolt that doesn't protrude from the fork crown at the rear. To mount it from behind I'd need washers with an internal diameter large enough to clear the long mounting bolt and an external diameter small enough to fit in the recess in the back of the crown. Or a different mounting bolt. This was the easiest way by far.