How to choose a bicycle ?

Here, we abandon all brand, with only his factors and handle roughly a bicycle to judge whether accord with the most basic request, this article is suitable for bicycles don't know much of your friends.
First of all, we must have the thoughts, all the plants will produce unqualified products, bicycle, regardless of how this bike brand in the industry, he is how lofty status in her home before decision before her appreciation. Even find anything wrong with her also adjusted to the best condition! Below:

First: overall inspection
Brand vehicle should be equipped with packaging and related instructions.
Equipped with good sense, vehicle in the frame should center on center.
Appearance: components should be no obvious defects exposed surfaces, trademark, applique design should be clear and complete
Existing paste, damaged or dislocation; etc. Paint, DianDuJian fine appearance.
"This kind of parts, including frame, fork, put the stand pipe etc, this kind of parts of the weld surface should be uniform, tidy, ten million cannot have seam, welding, welding, welding, such as phenomenon, once discover regardless of XX.
The symmetric (including bicycle fork, frame, etc) and shelf frame center plane symmetry.

Second: check the sharp edge
Here is the main consideration in normal riding, handling or repair process, the rider's hands, legs may reach place, should not appear sharp edge there. The problem is where to have: shelf, cushion bottom, frame, eliminate holes. In addition, each bolt exposed part should be less than the diameter of the bolt.

Third: the rotating parts
Each rotating components (including frame fork, crank sprocket wheel, pedal, etc.) should be flexible rotation, no loose, block, etc. In the process of crank with frame under fork to have enough after clearances, wheel and frame and brake) also should have enough between the skin and the brake clearance (but not the distance between the circle is too much, the guarantee in 2-3mm better)

Fourth: transmission parts
The transmission parts (including crank sprocket, flywheel, chain, etc.) should be flexible rotation, should be no turning off phenomenon such as chain chain, jump, crank, wheel, chain and shall not cover or frame is friction.

V: braking system
Braking system must be flexible and reliable, and brake installation must conform to their usage, brake handle and handlebar distance will suit oneself of hand size.

Sixth: transmission device
Variable speed device in the range should be clear and reliable shift, no gap, jumping gears, etc.

Seventh: other aspects
A qualified bicycle saddles, tube, handlebar securely marker, Control lines (mainly refers to the transmission line and brake lines) should be long enough, steel wire nooses in steel should be smooth movement in steel wire ends, or steel wire should be passivation hat, Stand frame should ensure handlebar in any position when not overturned stood frame orientation, reset flexible sound. Reflectors, after the former white red wide-angle reflector, and also on the wheel with the best side of active, reflective reflector is the best.

Well, first write so much! (don't think so much), the hope can be helpful to you.