Not quite small wheels but didnt see the point in starting a new thread.

I have got 2 x 150mm wheels with solid rubber tyre of about 1 to 1 1/2 inch thick.

I weighed the bot yesterday and am between 1/2 to 3/4 of kg over weight. I see the wheels as the easiest place to loose weight. The wheels weigh about 1/2 kg each.

Does anyone know of or where i can get some 150mm grippy lightweight wheels?
Thanks Glen