How to distinguish between steel and aluminum bicycle frames

1.

Magnet, aluminum alloy can not be sucked;

2.

Look at the welded joints, aluminum alloy welded joints are large, generally about 5 mm, or even more;

3.

Listen to the sound, finger playing the wall of the tube to listen to the sound, the general sound is more airy and weak -

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. 4.

Weight, aluminum alloy is generally lighter than steel about half.

5.

With a screwdriver in an unrelated place to scratch the wall of the tube,

Aluminum alloy is softer, the imprint is obvious;

6.

Look at the thickness of the wall of the tube, aluminum alloy bicycle frame, in order to ensure the strength of the frame, are made obviously very thick, quite thick.

7. Aluminum alloy frame: the general frame is thicker, the shape is very variable, the frame's tubing has a shaped structure, the welded part of the weld is usually a large weld (but there are also relatively small, generally is the weld later polished to increase the degree of aesthetics), and then there is the weight is relatively light.

8. High-carbon steel frame: the general frame is slender, tube to round or oval mostly, tube shaped less, weld joints are smaller, usually not polished, heavier weight.

The above is the main way to distinguish between aluminum alloy and high carbon steel, there is a more thorough, is to pull down the car seat tube, direct observation of the frame seat tube parts, aluminum alloy will have an oxidation layer, high carbon steel usually have rust, this is the most essential difference.