I'll play Devils Advocate. I'm really not trying to sound like a douche, but that's a lot of money to invest. Have, for example, you spoken to the likes of Tower Hobbies to ask how many wheels/tyres (
Badlands Style) they sell in a year? Have you got a prototype you can show them to get an order before you start ramping up manufacturing?
Whilst it is a good idea, and there is demand in the market, I just think it will take you a long time to shift 3000 units. I would try to get 100 units manufactured, persuade the major hobby stores to stock maybe 20 units of them each, then see how they sell and if they come back asking for more. That way you don't have 3000 units around and loads invested.
People on here, myself included, will all say this is a great idea. But get the numbers right and the orders booked before you invest all that money. It's a niche market, so really be careful.
P.s. I would look instead at selling a "do it yourself" kit with all the glue, tape, different sizes of belting, etc., and some really great instructions/YouTube videos, that people could buy to belt their own
Badlands or other wheels. Less money invested - you can probably place a much smaller initial order, or even buy all the items separately and put the kit together yourself in the beginning.