(English version follows Chinese Part)
2014年暑期买回来的山地车（更多细节，点击查看历史日志）按照“行者”APP的记录，到今天已经行驶了600km，在骑行爱好者里绝对算不上多，不过也小有成就感。由于正常的损耗，最近传动系总是传出轻微尖锐异响，我决定检查检查，算作里程保养了。这里不得不首先提一下我的自行车工具套装（如图1），非常实惠，是我在淘宝上花了179RMB买的，其工具之齐全，可以胜任绝大多数自行车维护工作，之前的保养、换胎以及这次的保养工作都用到了这里面的工具。
Since 2014 I owned my mountain bike (Check past post), Xingzhe APP marked about 600 km. It is not outstanding among biking buffs, but I am proud of it. Then fray on my bike has its signal, little noise from transmission. Checking and repairing would be a good choice, when it is time to so some regular maintenance. I have to introduce my tool box as Fig.1, this cheap and useful box took me only 27 USD. Almost every maintenance step can be done with tools from the box. It is a example that I changed tires with tools last time.
图1(Fig.1)
循声而去，发现异响来自后拨链器的两个导轮（如图2），那就拆下来看看，发现除了污物侵入了轴承，润滑脂也基本耗尽。彻底清洁后如图3，接着再涂抹上新的润滑脂，装好复原，异响消除。
Follow the noise, problems are from two pulleys as Fig.2. Remove them and you can see those dust and dirt without less grease. Cleaning has been done then renew pulleys function so well with no noise again.
图2(Fig.2)
图3(Fig.3)
后来想想，反正都把工具、耗材拿出来了，那就再把整个传动系都保养一遍，按照教程里的步骤，拆下了整个中轴部件，如图4。
Anyway, tools and materials have been taken out, I decided to check the whole transmission system according to the user guide book. Parts of bottom bracket have been shown on Fig.4.
图4(Fig.4)
发现中轴使用的是163110-2RS滚珠轴承（如图5、6），可以说是自行车中轴里最广泛的型号，如果要更换的话也不麻烦。没什么大问题，就是在用手慢速转动的时候，某个特定位置稍有阻力，可能是长期骑行后有滚珠磨损较大，或许与个人的骑行习惯有关。这点情况并不碍事，组件里没有发现太多污物，润滑剂也没有太大损失。稍作清理，更新部分润滑剂就原样装回了。
I found out that bearing is type 163110-2RS (Fig.5 &6), which is widely use in bike industry. It would not be difficult to find a spare for it. Maybe I have bad habit in riding, a little obstacle can be feel when I rotate the bearing until a special position. Not big deal. Cleaning and assembling.
图5(Fig.5)
图6(Fig.6)
最后还稍微调整了一下前后拨链器的行程。本次保养完成!
Adjustment has been done to front derailleur & rear one. Job done!