Buying a bicycle is like buying clothes. It is necessary to adapt to the occasion's physical and functional needs. To engage in cycling, you first need to buy a bicycle that is enough for you to "sport." The term "sports" here is a condition for forming a movement in the distance at the speed of a bicycle ride. Therefore, a sports bike should be a fast cycling bike that can't be too fast when riding fast. The accuracy and durability of fast-riding parts should not be too bad. The transmission lubricity of the steel parts must also be of high level, and of course, there is a labor-saving, fast-running bicycle. Of course, the relative riding distance must be further away. Judging from the above requirements for sports bikes, it is not surprising that a good sports or competition-class bike will cost tens or even hundreds of thousands.
A frame size
To purchase a bicycle for exercise, the first thing to notice is whether the frame size is suitable for the rider's size. The measurement of the frame size is generally based on the length of the frame standpipe, and the length of the body frame of the standpipe is also longer; it is also possible to sit on the seat cushions and place the pedals up and down on the pedals, in the lower leg It can hang straight down naturally, so that the height can make the foot have ample space to stretch when stepping on. The frame size of general road bikes is mostly one centimeter per two centimeters for mass-produced frame brands, while the premium handmade frame brand is one centimeter for each centimeter. The center of the (central gear) central axis to the upper tube riser can be gradually increased from a minimum of 47 cm to a total of 8 or 16 cm. We can use:
Cross-over length × 0.65 = frame standpipe length
The above formula to choose the size of the road frame that fits your height.
In terms of mountaineering SUVs, it is the center of the (central gear) center axis upright pipe joints. Each inch is a size, and the size of the frame size can be increased from 14 inches to 22 inches in total. size. Due to the large distance between the mountain bikes, it is impossible to measure the frame size suitable for the rider with an accurate formula. Only the appropriate frame can be used for riding. Taiwan is usually based on 14, 16, and 18 inches. It is suitable for riders to be height-based, about 14 inches below 155 centimeters, 16 inches at 155-170 centimeters, 18 inches above 170, and above 180 centimeters. Friends should try to find bicycles that are more than 20 inches.
Second, the size of the leading handle
In addition to choosing the bicycle should pay attention to the frame size is suitable for the body, the other two must pay attention to choose the size of the faucet and the handle. The measurement of the length of the faucet is generally based on the hand arm and the lower arm at 90 degrees, the elbow against the front edge of the seat cushion (cushion rod should be adjusted to the central position of the seat cushion), at this time the middle finger tip should be three fingers to three fingers from the rear edge of the handle. Half the distance, if the size of the frame is suitable for the body, the length of the faucet used is usually 11 to 13 centimeters (one dimension per centimeter).
In the case of a road bike, the choice of the handle width is to hold the handle against the shoulder and the two ends of the handle should be in the middle of the arm where the upper arm connects to the shoulder. The size of the handle is generally 42-45 cm (a size for each centimeter) of the outer edge of the handle. If the measured proper size is 42 cm, it is recommended to use a 43 cm larger handle, which can increase the leveling force of the stand-up swing when sprinting or climbing uphill, while taking into account the low-resistance characteristics of the posture. In order to increase the riding performance of the mountain bike, the handle width is much wider than that of the road bike, and the width is mainly 56 cm and 58 cm. The width of the handle used in the downhill race is more than 63 cm.
Third, the frame material
The frame is the soul of the bicycle. A good bicycle frame must meet three conditions: light weight, high strength, and high rigidity. Of course, as a type of bicycle exercise, the lighter the better, so that the faster the ride, the faster the ride; the strength is enough to refer to the safety concern that the frame will not break under high-strength ride; the high rigidity means The frame should be hard enough, and sometimes a frame with poor rigidity may not be safe to worry about, but the strength of the frame is so poor that the rider can get up and feel heavy even if it is light enough and strong enough. The frame is too rigid but this is still an unqualified exercise bike. Among the commercially-available types of vehicles, the frame material that can meet the above-mentioned good frame standards includes four types: aluminum alloy, carbon fiber, titanium alloy, and alloy steel.
Aluminum alloy:
The texture of the aluminum alloy ride is sensitive, lightweight, and highly rigid, but at the same time it also conveys the vibration response of every single point on the ground, while slightly sacrificing comfort.
carbon fiber:
The characteristics of carbon fiber are more flexible, stable ride, long lasting cruising, and high comfort.
Titanium alloy:
The characteristics of titanium alloys are very similar to the combination of aluminum alloy and carbon fiber. It can have the similar elasticity of carbon fiber and can also enjoy the lightness and rigidity of aluminum alloy, but these benefits can be achieved much higher than the price of other materials.
Alloy steel:
Steel is the most traditional frame material for bicycles. Modern alloy steels can achieve good results in terms of rigidity, elasticity, transmission, and stability. The only drawback is that steel is heavier in weight than several materials. .
We must remind readers that each of the above materials has a high or low grade. The features described here are based on high-grade products (ie, high-priced products). It can be said that there is no (all poor). In addition, although some products are expensive, due to insufficient material processing capacity (such as carbon fiber and titanium alloys) or manufacturers' poor design of the frame, there may be products with poor riding experience. Anyhow, any Material will have a good or bad grade, can not be generalized.
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