The structure of hub and cassette in bicycle (HG/MS/XD/XDR)

Hey there! I wonder if you have any such questions. Currently, there are various matching structures of bicycle hubs and Cassettes. So how many matching structures are there? What kind of sound structures do different models have? Then I will answer these questions with you in this article.

HG&MS:

First of all, we also look at the HG Cassette structure designed by Shimano, which is the most classic and has become a standard in the bicycle industry. It is widely used in road bicycles and mountain bicycles. Its advantage is that it is easy to assemble and has smooth shifting. Excellent experience, but with the development of the bicycle industry, the traditional 11-speed freehub can no longer meet the needs of the majority of cyclists. Then the MS structure was developed by Shimano. Compared with the HG structure, the MS bicycle hub ratchet is compatible with 10T And the size ratio range of the 12-speed freehub can effectively improve the bicycle's climbing ability and high-speed cruising ability. Secondly, the MS structure has more spline teeth (23 in total). This brings the benefit to the Cassette that the force acting on the hub base is more balanced, which can effectively reduce wear and consumption. The third point is that for high-end downhill trucks, in order to ensure the reliability of the bike freehub, we choose other freehub that are usually made of steel, but the consequence of this is increased weight, and the MS freehub itself is relatively When the HG freehub is light, there is no need to use rigid materials for processing, which can effectively reduce the weight of the bikes. One last thing to note is that the MS bicycle hub ratchet is only compatible with the 12-speed Shimano Cassette. Therefore, while providing a larger gear ratio for the bicycle, you must also pay attention to the related matching parts specifications, so everyone is When purchasing an MS Cassette, be sure to choose a bike hub that corresponds to the freehub base structure.

XD/XDR:

In addition, SRAM’s bicycle hub ratchet is shown in the picture below. Thanks to different designs, both the XD and XDR ratchet hubs of SRAM bicycles are compatible with 11-speed and 12-speed cassette. Then going back to the structure, it is still a Spline teeth cassette. Only designers of speed couplings place the locking thread on the outside of the ratchet; The XDR is a ratchet structure designed for road bikes. The longer spline tooth length allows it to use a thinner road bike Cassette. Of course, if you want, we can also place a 1.85 mm spacer on the spline teeth. Use it as an XD ratchet.

The above are the common structures of bicycle hub ratchets. If you have any questions, please feel free to contact us for discussion.