Get a tire/wheel (or tyre as you so called it, lol), put it on a balancer, spin it and it will stop with the heaviest point at the bottom. Put a mark on the tire/rim at the very bottom or 6 o'clock point. Take it off the balancer, put an amount of modelling clay on the inside of the rim at the point that is complete opposite of your mark that you made. Jam it into the corner. When your mark is at the 3 or 9 o'clock position, your wheel is balanced. If not, add or take away clay til you're happy. Just use the one point. Don't go adding clay at different points. I see rcspeedmart is using something that isn't clay. Looks like a tape of some type. I'm gonna give to a shot if I can find a balancer. Maybe I'll just remove a dog bone, mount a wheel and give it a try.