Diameter algorithm: press a straight line with the wheel, and then divide the measured length by 3. 14 to calculate the diameter.
Extended data:
Selection and purchase
Riding intensity
According to the classification of mountain bikes, they can be divided into two categories: leisure sports and competitions. The route of the former is mainly asphalt road and low-difficulty silt road, while enjoying the beautiful scenery along the way to achieve the purpose of exercise and fitness. The latter route emphasizes taste, and the riding intensity and height have a certain level.
Dimensions and accessories
No matter what kind of riding type you choose, you must choose the right frame size and fit it to adjust the appropriate riding posture, otherwise even if you choose top-class car models and spare parts, it will not meet your riding needs and even affect your sports efficiency. It is especially recommended that the distance from the crotch to the upper tube should be higher than two fingers, which is an ideal state.
Test ride
Although riders first consider exterior painting, just like buying clothes, they usually have to try it on to know what it feels like. The same is true for bicycles, because buying a car is not just about appearance, but more importantly, riding.
Baidu encyclopedia-mountain bike
Baidu encyclopedia-tire