You can choose a leisure bicycle from the following aspects:

1. Frame size

1. When choosing a bicycle for exercise, you must first Pay attention to whether the size of the frame is suitable for the rider's body shape. The measurement of the frame size is generally based on the length of the frame's riser. A frame with a long riser will have a longer body length. A frame with a short riser is suitable for girls with short stature. The specific measurement method is: sit on the seat, put your feet up and down on the pedals, and the lower legs can hang naturally and straighten. This height allows your feet to have room to stretch when pedaling.

2. Generally, the frame size of road bikes is one size every 2 centimeters for mass-produced brand frames, while the size for high-end handmade frame brands is one size every centimeter. From the center of the central axis (large toothed disc) to the center of the upper riser, the size can be gradually increased from a minimum of 47 cm to 62 cm, with a total of 8 or 16 sizes.

You can use the following formula to choose the road frame size that suits your height:

Span length × 0.65 = frame riser length

3. As far as mountain terrain is concerned, it is from the center of the center axle (large chainring) to the center of the upper riser, with one size every two inches. As the size interval of the frame, it can gradually increase from 14 inches to 22 inches, with a total of 5 size. Due to the large size range in mountain terrain, it is impossible to use precise formula calculations to measure the frame size that is suitable for the rider. You can only choose a roughly suitable frame based on your height. Frames available on the market are usually 14, 16, or 18 inches, and the suitable ones are based on the height of the rider.

The list is as follows:

The size of the frame corresponds to the height of the model

14 inches and 155 centimeters or less small bowl

16 inches 155-170 cm Thistle Tree

17 inches 170-175 cm Yifu

18 inches 175-180 cm Bangge

Over 20 inches 180 cm Above

2. The dimensions of handlebars and stems

1. When choosing a bicycle, in addition to the size of the frame that must be suitable for your body shape, the other two dimensions that you must pay attention to are the handlebars and handlebars. . The handlebar is professionally called "bar"; the handle is professionally called "stem". The length of the stem is generally measured with the upper arm and lower arm at 90 degrees, with the elbow touching the front edge of the saddle. At this time, the distance between the tip of the middle finger and the rear edge of the stem should be three to three and a half finger widths. If the size of the frame is suitable for your body shape, use a full-length stem faucet (mostly 11 to 13 cm in length, one size per centimeter); if the size of the frame is slightly larger than your body shape, choose a shorter stem faucet. Length (10-12 cm); if the size of the frame is slightly smaller than the body size, choose a shorter length (14-16 cm) for the stem faucet; the above size recommendations do not cover personal preferences, for example: friends who like to play with cars You can choose a smaller frame and stem.

2. For road bikes, the width of the handlebar is to press the handle against the shoulder, and the two ends of the handlebar should be located at the connection between the upper arm and the shoulder. The center of the arm. The size of the handle is generally 42 to 45 centimeters from the outer edge of the handle for men in Beijing (one size per centimeter). If the measured appropriate size is 42 centimeters, it is recommended to use the next larger size of 43 centimeters. It can increase the acceleration force of the standing swing bike when sprinting on flat roads or going uphill, while also taking into account the low wind resistance characteristics of the posture. In order to increase the control performance of riding, the handlebar width of mountaineering off-road bikes is much wider than that of road bikes, and the width is usually 56 cm or more. There are two main sizes: 58 centimeters. The width of the handlebars used for downhill racing is more than 63 centimeters. Friends who want to buy a car can choose what they want.

3. Frame material:

The frame is the soul of a bicycle. A good bicycle frame must meet the three conditions of light weight, sufficient strength, and high rigidity.

As a bicycle type, of course, the lighter the weight, the better, so that you can ride faster with less effort; sufficient strength means that the frame will not have any safety concerns about breaking and bending under high-intensity riding; high rigidity It means that the frame must be hard enough. Sometimes a frame with poor rigidity may not have safety concerns, but the strength of the frame is poor when riding, making the rider feel like the car is dragging heavy when pedaling, even if it is light enough and strong enough. A strong frame but poor rigidity is still an unqualified sports bike. Among the car types on the Beijing market, the four frame materials that can meet the above-mentioned good frame standards are: aluminum alloy, carbon fiber, titanium alloy and alloy steel.

1. Aluminum alloy:

Aluminum alloy feels sensitive, light, and highly rigid, but at the same time it also conveys every bit of vibration response on the ground at the slightest expense. for comfort. It is relatively cheap and comes in many frame styles, making it a popular choice for everyone to buy.

2. Titanium alloy:

The characteristics of titanium alloy are very similar to the combination of aluminum alloy and carbon fiber. It can have elasticity similar to carbon fiber and enjoy the lightness and rigidity of aluminum alloy. . Its special point is that due to the sudden expansion coefficient, it is impossible to paint the metal surface. Fortunately, titanium is not easy to corrode and oxidize, and the color is also unique. But its price is also beyond the reach of the first two.

3. Carbon fiber:

Characteristics of carbon fiber: elasticity, stable riding feel, good continuity during long-distance cruising, and high comfort. The disadvantage is that the price is very high, and the average service life (calculated from the factory) is only 5 or 6 years. Even if the frame does not have any bumps within 6 years, its chemical formula has been decomposed, and Zhiqiu does not recommend that riders continue to use it.

4. Alloy steel material:

Steel is the most traditional frame material for bicycles. Modern various alloy steels can achieve good results in terms of rigidity, elasticity, transmission, and stability. The only drawback is that steel has a defect in weight, and it is heavier than the above materials. Generally speaking, alloy steel materials are relatively cheap, and Giant Bora series is a typical representative. However, the price of high-quality chromium steel and chromium molybdenum steel frames is not cheap, and it cannot be compared with the alloy steel materials purchased from street stalls.

Summary of frame materials:

Zhiqiu here reminds riders that each of the above materials has high and low grades. The characteristics described here are all for high-end products (that is, high-priced products), and the above advantages and disadvantages cannot be said to exist in low-end products. In addition, although some products are high-priced, due to insufficient material processing capabilities (such as carbon fiber and titanium alloy), or the manufacturer's poor geometric design of the frame, there may also be products with poor riding feel. In short, any All materials are graded into good or bad grades, which cannot be generalized due to the selection of landforms.