Reach out and ask dad for money to say his mood.

Just pretend to be good with your dad and say that you don't want to ride a motorcycle and want to buy a bike. Then, in order to show your determination to study, you decide to go somewhere by bike (at least100km away from home) to exercise your will, so that you can ask for money to buy a professional "bike". Your father should be very moved and won't object to seeing his son so determined. Then you say that you have taken a fancy to that bike, and it's a trek brand (there are tens of thousands of better bicycles in trek, and you can look at the model yourself on Taobao), and then you tell him the price and buy riding equipment (gloves, kettle, clothes, helmet, horse watch). . . It takes thousands of dollars to be better, so that it can be more like it, and then the money will be available.

Ps: If your father goes shopping with you personally, you can buy an expensive bike, such as 40,000-50,000 trek~ and then sell it to me for 20,000, haha ~ ~