A disabled biker hoping to attend his first Welsh National Motorcycle Show is among many who have contacted the BBC to criticise its cancellation.
Glyn Griffiths, 65, from Tre'r-ddol, near Machynlleth, Powys, had already paid £25 for a ticket and had intended to ride to the event near Builth Wells.
Police blamed the threat of violence, but Mr Griffiths, who has arthritis, said it was a family event.
Other motorcyclists said it was discrimination against bikers.
The annual Welsh National Motorcycle Show was to have taken place at the Royal Welsh showground in Llanelwedd between 23 and 26 May.
But Dyfed-Powys Police said there would be a "significant risk of violence" between rival bikers' gangs if it went ahead.
Mr Griffiths, who has been riding motorcycles for 50 years, is forced to ride a three-wheel bike, or trike, because of his disability
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BBC NEWS | Wales | Mid Wales | Bike show axing 'discrimination'
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