Gearing

[BMP Racing]

My daughters 50m tops out at about 28-29 mph. We are running the stock size 145-70x6" tires and stock gearing. Never Ready Racing said I could replace the stock 19 tooth front sproket with a 24 tooth front. What kind of speed will I get with going 5 teeth bigger on the front? I will go with bigger tires after she wears the stock ones out, which won't be very long! I am however going to stick with the stock 6" wheels as they are hubless and I don't really want to sink any more $$$ into this thing. Looking at the AMS Fox tires in the 15-7X6" size. Thanks for any and all help!!!

Brad