The newcomer asks a question: I have an old Decannon Rockrider 5.0 bike with 21 speed, the front and rear wheels are the kind with upper screws, and the transmission is similar to that of Giant XTV800 (the measuring tape may not be very accurate). I want to buy Garmin Flux S cycling platform recently, I wonder if this bike can be installed on the platform, if not, I will buy a new one.