Needed Gears for RC Baja

Hello, sir

I have purchased 1/10th Stock Class Brushless ESC and motor combo and I have already purchased the pinion gears which was 28T and 76T spur gear. The top speed for the car after calculations is 25 mph, and my Gear ratio is 10:1 and I was wondering what kind gears are needed to complete my setup. My senior project is about building an RC baja and I honestly want to make sure that I have the right components. 

Best, 

Ahmad