I'm wondering why f5 and 1/500th? You shot manually, so you chose those settings.
The crowd is still too sharp and doesn't pick the bike/rider out enough. The IOM sign is on the same focal plane as the bike, so would have still been legible at a wider aperture. f2.8 at 1/1600th and that would have been a much better shot IMO.
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You'd get more response if this was in the Motorsport section I reckon.