I'm going to have to agree with everyone else on this and call your bluff. Your not lying, just hugely mistaken. It's ok. There is no way your going 50mph on that setup. I don't have to ride yours, because I know it's not true. Maybe if you weighed 100lbs, wore girl jeans, geared 18 X 36 and going down a huge hill I might believe it. Other than that your full of it. Believe what you want, but if your going to post on here you better have a legit 50/50. I'm guessing you go about 43 tops. Try riding with someone that really goes 50mph and you will understand your mistake.