Your best bet would be to get the Ofna Truggy wheels that allow you to keep the stock 17mm hexes and use the MT tire of your choice much stronger setup.If you are using a conversion kit it will have adapters that will allow you to use the more standard 14mm hex that most MT`s come with from the factory.You might find faster response next time in the MT forum
As far as the 23`s I think they are a waste,they break axles and add weight.