I have almost got my Bird back on the road. I have one last problem. I was needing to know what's the biggest wheel and tire comb that you can put on this Bird without any modification? I was think something like a 15x8 with 4.5" backspaing on the rear and a 15x6 on the front. I'm really not sure what size tires. I would like to have the biggest possible. I have read the FAQ's section it has help but stil wondering if anyone else could shed some light on the situation. Thanks for your help.