Just look them firmly in the eye as Mike said and say "No" in a firm voice. If they start to get aggressive. Put your bike to one side if your on your own. If your with a mate give it to him. Stand right in front of them and say right, so which one's the hardest, if they don't reply, say thought so. They will probably walk off. If you prove your not scared and you'll stand up to them then 9 times out of 10, they wont do anything. Never use weapons though. Thats what you have fists for. Just make sure you hit em' hard enough. Danny.