3 important technical parameters you need to know when select a frame Currently, the material can be used in making bicycle frame are the following: steel, aluminum, titanium, magnesium alloy, scandium alloy, carbon fiber, etc., the most common material in the general market are mainly steel, aluminum, titanium, carbon fiber. These types of materials from which to choose their own frame, it is necessary to understand the three major technical parameters of various materials. 1.Strength (STRENGTH) Suppose hanging on the other end of the metal rod weight heavy enough to make the metal rod to produce permanent deformation, that is, when you move heavy objects, bend metal bars still showing, not fully reinstated, and the so-called yield (yield) . Yield strength of the material to achieve because of the different materials and different, this is called strength. Strength and durability of the frame and ride related but independent of quality. Strength (strength) is determined by the yield strength of the material (yield strength). Quality and yield strength of the pipe frame, alloy composition and heat treatment process (some brand types) have a significant relationship. 2. rigid (STIFFNESS) Suppose one end of a metal rod fixed in the fixture, the other end with a certain weight so that the root temporarily bent metal rods, that when the weight is removed, the metal rod immediately restore the original shape. The same weight imposed on the different materials, it will produce a different degree of curvature, which is rigid. Rigidity of the ride quality of the frame, because the frame fear occurs during normal riding variants. It depends on the elasticity of rigid material, and a very important component is independent of the elastic coefficient and the quality of the metal and its alloys. For example, all types of steel, having substantially the same coefficient of elasticity. 3.weight (WEIGHT) In addition to the strength and rigidity, weight is an issue. And rigid, like the weight of the material affected by alloy composition is quite mild. Even if you close the frame “Lite Steel TM” (lightweight steel), in fact, almost all the steel of equal weight. Here are some of the features of our several common materials Material Elastic coefficient (rigid) strength (yield point) Weight (kg / m) Steel 30 46-162 7800-8200 Aluminum 10-11 11-59 (4-22 after annealing) 2700-3200 Titanium 15-16.5 40-120 4500-4700 Please note that the rigid has nothing to do with the weight or the quality of materials, heat treatment or alloy composition. For example, all vehicles with steel pipes, from cheap bicycle supermarkets to thousands of dollars worth of bicycles have the same elasticity coefficient 30, and 490 weight. From the above table we can see, these types of materials do we use the frame, in the same shape and thickness of the pipe, the aluminum frame rigid steel frame only one-third of titanium car only steel frame half frame of steel. The comparison above is general and does not make much sense, because no one will use the same specification to build three different frame materials. The actual bicycle according to characteristics of the material included in the calculation, select each pipe diameter and wall thickness of the composition frame. Then the rigid frame and the main related to the diameter, and the strength was mainly related to the pipe wall thickness (diameter also relevant), and the diameter and wall thickness will affect the weight of the frame. Frame manufacturer must measure the intensity associated with different diameters rigidity, thickness and frame, the weight, and make a decision.