To determine whether the aluminum mountain bike frame depends on the following two points analysis:

1, Aluminum Alloy frame: the general frame of relatively thick, shape changeable, frame tube shaped structure, welding parts usually large solder joints (but there are also relatively small, is the general appearance of the solder joint late grinding increase), there is comparatively light weight.

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2, high carbon steel frame: general frame slim, tube to round tube or ellipse is the majority, pipe shaped less, solder joint is small, usually do not burnish, weight is heavier.

The main method is to identify Aluminum Alloy and high carbon steel, and a more complete, is to unplug the car seat tube, seat tube direct observation frame parts, Aluminum Alloy have oxidation layer, high carbon steel usually have rust, this is the most essential difference. Can you tell the difference?