How to tell the quality of a bicycle

What’s the difference between riding a few hundred yuan and riding a few thousand yuan bicycle,There are a large number of parallel imports and knockoffs on the market (some of which are not identifiable by the naked eye). It is easy to buy parallel imports and knockoffs without understanding the market. 500 mountain bikes can be ridden but cannot be played, let alone not. It is stable and reliable, and the quality is guaranteed. Everything is paid for.NO.1  First is the material

The first is the material

Generally, low-end cars will use steel as the material of the whole car. The disadvantage is that it is heavy and will rust. The advantage is that even if it is a low-end product, the strength is okay.High-end cars generally use aluminum or carbon fiber. Aluminum and carbon fiber have the advantages of light weight, no rust, and easy molding. And aluminum and carbon fiber also have grades. Mainly lies in the strength, welding process, the thickness of the pipe/the number of carbon cloth layers and so on.


Bicycle shock absorbers are divided into pneumatic shock absorbers and spring shock absorbers. The advantage of pneumatic shock absorbers is that the rebound strength is adjustable and the weight is light. The disadvantage is that the structure is complex, it is not easy to maintain and repair, and it is “more” squeamish compared to springs. Air shock absorbers are also divided into different grades. The main differences are weight, stroke, strength, support, lubricity, damping, rebound linearity, and so on. Among them, stroke, damping, linearity and strength are the key points. Generally speaking, the longer the trip, the more expensive the price. The more adjustable damping segments, the more expensive the price.

A good shock absorber can filter large and small vibrations to avoid slipping when riding through potholes, and at the same time avoid instability when braking and encountering large vibrations. The low-end shock absorber either has a shock absorber effect of almost zero, or is not linear, easy to bottom, rebound too slow or too fast, and the adjustable range is very small or almost no.

The difference between professional single suspension and full suspension mountain bike:

The single-suspension bike is simple, and the single-suspension mountain bike is an integrated frame structure. The front and rear triangles are integrated, which makes maintenance easier and the possibility of problems is low. Single-suspension vehicles are lighter, so single-suspension vehicles are usually lighter than full-suspension vehicles.

Single-suspension vehicle efficiency: the suspension front fork is used to buffer the road vibration, the rear wheel power is 100% directly transmitted to the ground, and it has excellent pedaling efficiency on the smooth XC off-road road conditions with sand and fine stones.

Full suspension car is comfortable: the full suspension car is divided into two parts: the front triangle and the rear triangle. In addition to the shock-absorbing front fork, the rear triangle is designed with a suspension structure, and the shock absorber is compressed and stretched to swing to achieve cushioning. Shock absorber effect.

Single-suspension vehicle efficiency: Even in bumpy and rugged road conditions, the tires can still cling to the ground, maintaining the best pedaling efficiency and grounding.

Full suspension vehicle control: excellent grounding and pedaling efficiency, which also means that the full suspension vehicle has good controllability. Even in a rugged and winding environment, it can still accurately control the movement trajectory at the fastest speed Pass barriers

How to choose the most suitable fork

The first rule for selecting or upgrading a suspension fork is to select the corresponding front fork according to the type of riding and riding habits. Generally, suspension forks can be classified as “for off-road XC” depending on the riding terrain and stroke length. : Suspension stroke is about 80-100mm; “All Mountain”: Suspension stroke is about 120-140mm, and “For free riding FR and downhill DH”: Suspension stroke is about 160-180mm, even up to 203mm, such as RockShox Boxxer, Fox 40RC2.

Another important point is the smoothness of the front fork. A good suspension fork must have a suitable combination of springs and dampers, but must also move smoothly. When buying a front fork, you can actually press it to see if the fork has never been stressed, compressed, compressed to the bottom (Bottom Out), and then rebounded to the uncompressed (Top Out) process, whether there is jamming or Feeling not smooth.

It is important to remind riders that the correct preload stroke (Sag) adjustment is very important. The so-called preload setting is to respond to the ability of the front fork to stretch downward when encountering a large depression. Taking RockShox as an example, its Sag is generally set at 25% of its maximum stroke; FOX is set at 20% of its maximum formation; Magura is set at 20-30%. In addition, how much air pressure the air pressure front fork should hit depends on the rider’s weight. Generally, there is a table of weight and air pressure on the front fork surface or in the user manual for reference.

In addition, many riders only use 80% of the available suspension stroke, resulting in either the fork being significantly softer and prone to bottoming, or it is too hard and poorly sensitive. To get a good tuning, RockShox recommends that a properly tuned suspension fork should use about 10-20% of its entire suspension stroke after the rider gets in the car; in case of a severe collision, it will Use up all the shock absorber stroke, but there will be no bottoming out. The ideal compromise between such soft suspension sensitivity and sufficient impact resistance requires excellent fingertip sensitivity during adjustment.

Variable speed

Generally, low-end transmission materials are made of steel, and plastics are used for dials and the like, and the processing accuracy is low, the strength is low, and the weight is large. High-end transmissions are generally made of most aluminum materials + a small part of steel, aluminum alloys are used for the dial, and many parts with high strength requirements are processed by CNC technology, and the accuracy, strength and weight can be achieved very well.

Another valuable part of the transmission system is the rear derailleur. Like Shimano XT and above rear derailleur, even one-way damping bearings are used to keep the chain stable. Some rear derailleur uses carbon legs to increase strength. Another place that is easy to overlook is the transmission line and the line tube. The lubrication degree of ordinary transmission cable and the cable tube is poor, and it is not smooth to use. High-end transmission cables and pipes (such as XTR) are coated with Teflon material, which feels very light and crisp, which is more conducive to accurate shifting.


Brakes are divided into cable pull/hydraulic V brakes and cable pull/hydraulic disc brakes. The V-brake has low cost, higher reliability, and is easy to maintain, but it is very easy to lock up, and it is easy to fail when exposed to water. The V-brake cannot be pulled even when braking for a long time. Disc brakes are not perfect either. The first is that the linearity of the cable-pull disc brake is very poor, which only alleviates the problem of the V brake being easy to lock, and the weight is only relatively lighter.A good hydraulic disc brake has light weight, good linearity, strong clamp/piston force, and low thermal attenuation (mainly relying on high-quality DOT oil or mineral oil. In addition, oil discs like XTR are still coming to add heat to the chip. 器). Disc brake discs are also very important. The first is that it needs to be light, while ensuring high strength, and will not easily swing or break. In addition, it needs to be well ventilated to facilitate heat dissipation. The more famous high-quality discs are Shimano’s sandwich discs and Hope’s floating discs.


The quality of the frame has a lot to do with materials, design, and functions. The frame is divided into two types: soft tail and hard frame. Generally, the soft tail is more suitable for high-intensity riding, while the hard frame usually stops at the XC level.

Soft tail with shock absorbers (a few hundred yuan domestic mountain bikes also have rear shocks, but the goods are not in the scope of discussion), the price of rear shocks tends to exceed the front fork, mainly because good rear shocks are usually Double gas chamber design avoids bottoming, and the second gas chamber is filled with inert gas. In addition, the rear shock emphasizes linearity and rebound. The welding process of the frame is also very important, which directly determines the strength of the entire vehicle.

Round Group

The wheel components are rims, spokes, hubs, inner and outer tires. There are roughly two types of hubs: bearing and ball bearing. Bearing can achieve good strength and lubricity at low cost, but for higher precision, the composition of the bearing wheel will increase significantly.

The structure of the ball bearing is relatively complicated, the maintenance is inconvenient, and the high strength also requires high cost to ensure. The spokes seem to be the least valuable, but in fact they are quite famous. The main difference between the rims is the strength, as well as the adaptable inner and outer tyres: the rims of the high-end wheels can be compatible with tubeless tyres. The inner and outer tires are relatively less complicated, but the price gap is still not small. The difference is mainly in terms of wear resistance, grip and weight.

Any part of a bicycle plays a vital role in the safety of the whole vehicle, and any broken part may cause a serious accident. Seemingly similar materials, the craftsmanship varies greatly, and the cost of the product is not even the slightest difference

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