国产精品毛片Av区一区二区三 ,国产免费高清视频,伊伊综合在线视频无码

04-29

The difference betwe...

What's the difference between a bicycle knife ring and a flat ring?A: it's obvious that the one with the higher rim is the cutter ring, and the one with the lower rim is the flat ring, which is 88mm high. That is, the cutter ring, which is only 17mm high, is the flat ringHow about installing the cutting ring on...

04-29

Is the bigger the bi...

Q: is it better to use flat ring or knife ring for mountain bikeA: I'll give you some parameters if you like! It's better and harder to use the circle, but it's not suitable for climbing. Ordinary circle can be used for any purpose. Now the more common mountain circle is single layer, double layer circle, a...

04-29

Road bike knife ring

The so-called Dao ring of road bicycle is just a common name for people. Because the section of this ring is relatively high, like a Dao, it is named Dao ring. It's stronger than the general rim, and it's integrated with the aerodynamic design, which has the effect of breaking the wind, but also heavier....