The length of the chain is really important:
 The length of a chain is a place that is often overlooked when assembling a bicycle or a new chain. In fact, often in the car store to see the bicycle display of the chain is too long, the brand of the vehicle in the factory when the little negligence is easy to use at home in the process of riding off the chain or change the file is not smooth. And the chain is too short will lead to disastrous consequences, because the chain is too short will cause the chain to the flywheel of the largest gear number file and cause the chain is too long in a large pull. Because when riding in the rotating system of the chain tension is too high, even pull bad transmission and breaking the chain, not to mention this because of carelessness and high maintenance cost the.
 On the choice of post:
 The rear transmission of your bicycle is very important in the chain length. It can make chain in rear derailleur guide wheel and the flywheel teeth number of teeth and tooth disk group have additional relaxation, you can also dial the action of the spring so that the chain tension compensation in the flywheel gear number of teeth and tooth plate market. After dialing a long, short legs. Usually choose the principle is the more you need to gear transmission than choose longer legs. This is because can correspond to more gear combinations, if you choose short legged rear derailleur and high ratio of tooth disc (such as three piece tooth disc) requires a longer chain to compensate for the short legged rear derailleur to change than the lack of capacity and. Choosing the wrong leg length will be very easy to cause the error of the chain length. (Editor: that is to say you use the flywheel three piece mountain bike that a large number of teeth dribbling the selected legs. Remaining can select leg, according to experience, legs don't mess with, generally single disc folding bike ride highway flywheel and severe off-road fr to DH level car frequently used short legs)
 The chain is too long will your transmission is difficult, and very easy to swap chain, but too short will is you soon after you dial say goodbye ~ check your chain length is very important!
 some suggestions
 The maximum distance of the tooth disc and the flywheel in the maximum number of teeth is the length of the straight line in the upper part of the chain. This data can be doubled to tell you about the length of the chain. (if it is full suspension frame to ensure stroke completely is not compressed)
 Now 10 speed and double disc tooth disk of the popular, many people abandoned three spools of tooth disk, because the three piece tooth disc can not guarantee the maximum tooth plate on the maximum number of teeth to match the flywheel gear vehicle use. But you are still in accordance with the largest number of teeth disc disc and the largest number of flywheel gear wheel method of long chain. Such comparison insurance.
 Some birds will use maximum transmission power to provide short rear derailleur chain tension to increase the transmission speed and the uphill. But this requires drivers to remember not to file transferred to flywheel maximum number of teeth disc, otherwise, and said before, and your dial to say goodbye. We do not recommend this choice of ordinary car.
 New car general factory is with the chain loading, so the new car to buy back when the chain length is not necessarily appropriate, remember to check clearly.
 Shimano and SRAM leg length is a bit different, even if the respective manufacturers in different years of production after the dial also may be different, so the loading of the time I remember to check.
 Full suspension vehicle:
 The correct length of the chain is actually very simple, for the designers of full suspension frame, often in order to provide higher performance stampede to the rear axle design away from the axis (small series: because after the full suspension bike after the shock compression stroke five positions and rear axle position will change). So the whole bike often require a longer chain to compensate.
 This is full suspension bike trip completely compressed look, if your bike use of pressure shock absorbers, drain the inside air (be sure to write down your suspension was originally played much pressure), if your car suspension with spring, please unload.
 Frame repair stand, don't have the car is placed in the ground or find someone to help you helped a little: Because so you can achieve maximum stroke, before gas suspension deflation is because the internal pressure will make the shock compression point to protect the shock to the frame after triangles downward pull and damage), the transmission is transferred to the maximum disc and the flywheel are maximum tooth.
 This is the chain is too short. Your back will tell you whether the chain length is appropriate, as shown in figure, after the dial has been pulled forward, and after the legs are parallel to the frame tube. If it is going for a ride is transferred to the shift force you ride, and prepare your rear derailleur chain said bye. At this time to add a few sections of the chain.
 This is added after the two sections of the chain of the rear angle, but also just a good point of view, leaving more margin to correspond to sudden stress generation.
Will go to the small chain wheel and the flywheel minimum number of teeth, this is the most standard. Pictured to the right is the chain is too long lead to chain is too loose, dial for the spring and the guide pulley on the chain pull back the, this lag will be inadequate, leading to failure chain and transmission is not smooth.