Both HFS and TFS only mention technology and frame manufacturing process. HFS is hydroforming technology, and TFS stands for imitating hydroforming technology. TFS can be said to be a simplified version of HFS, and HFS is better than TFS.

Extended data:

Several materials of bicycle frame;

1, aluminum alloy

Aluminum alloy is sensitive, light and rigid, but it also transmits the vibration response of the ground at the expense of comfort. Relatively cheap and various styles of frames are worthy of universal purchase.

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 that of carbon fiber and enjoy lightness and rigidity similar to that of aluminum alloy. Its special feature is that it is impossible to paint on the metal surface due to the jump of expansion coefficient, but fortunately, titanium alloy is not easy to corrode and oxidize, and its color is also very unique. But its price also lags far behind the first two.

3. Alloy steel materials

Steel is the most traditional frame material for bicycles. Modern multi-element alloy steel can get good results in rigidity, elasticity, transmission and stability. The only drawback is that steel is defective in weight, which is heavier than the previous materials. Generally speaking, alloy steel materials are relatively cheap, and the giant Bora series is a typical representative.

4. Carbon fiber

Characteristics of carbon fiber: good elasticity, stable riding feeling, good long-distance endurance continuity and high comfort. The disadvantage is that the price is high, and the average service life (from the factory) is only 5 or 6 years. Even if the frame hasn't bumped within 6 years and its chemical formula has been decomposed, Qiu Zhi doesn't recommend riders to continue using it.