12 speed and 21 speed, that's the same condition!!! What does this speed mean? Overall, how fast is the road car the best? Where should I buy a road bus?
Now the highest speed, other road vehicles should be 22 speed.The entry road car can choose a joint venture of Giant or Merida, domestic brands can choose XDS, don't consider other copycat.
In theory, the maximum speed is only up to your physical strength, but in general, the faster models are higher and lighter, so you can save more and reach the top speed.
How much speed is the gear that can be changed, the mountain car is the front three gear, so it is 3X 6-10=18-30 speed, the road car in front of only 2 teeth plate, so 2x6-11=12-22 speed.
