You don't have to be a World Champion to be great.
Leigh Adams qualifies as a great, just in my opinion, because of the way he conducted himself, gave everything for his Team, was a superb Ambassador for Speedway and also seemed, to me at least, to be a very 'Sporting' person as regards giving credit to others.
Greatness comes in many forms and a Rider I will always remember with a great deal of pleasure, for his actions both 'on' and 'off the Track, would be Leigh Adams.