"I think single bolt hubs require to be fully on the axle with a circlip at the axle end to stop it sliding off."
There are a lot of 50mm single bolt hubs that are illegal then. eg http://kartexpress.co.uk/index.php?main_page=product_info&cPath=3_58&products_id=2447
It used to be a requirement to have a retainer on the end of the axle when I started racing, but the axles were a lot slimmer then, 25 and 30mm.
I don't think I have ever seen a 50mm axle with a retainer circlip. Most 50mm hubs have a wheel centre pressed into the axle hole that acts as a stop, which means that the standard rim will not fit over a 50mm axle.
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