The next thing to know about the mountain bike disc brake is that they have different size and it should be understand when installing new rotor. Big size rotor looks strong and powerful, but when it used in the wrong place, the rotor cannot work in its best performance, especially in the mountain bike hardtail series. Hardtail frame is different with the full suspension frame in both design and usage. Those different impact to the parts that used in the bike, some parts will good work in certain bike, but will not in best performance in another. So, to get the best performance and keep it in good condition, the regulation should be implemented.
For the mountain bike with the hardtail model, the maximum rotor size is 7 inch, and it is not recommended for the rotor with bigger than 7 inch to be installed on hardtail mountain bike. The big rotor - 7 inch and higher - is the rotor for the all mountain class and higher; downhill and freeride, and usually the two types of bike are full suspension model. In the full suspension frame model, the swing arm has bigger and larger in size than the hardtail frame model. And also, fork for cross country bike is designed for small rotor size, maximum rotor size is 7 inch for cross country fork. This limitation of course has been tested by the fork manufacturer to get the maximum performance for each part in the bike, so it is better to learn about that first in the manual book from the fork factory.
So, according to the explanation above, it is better to see the size of the rotor when installing new rotor for the cross country bike or other type of bike. Also, with the difference size for hardtail frame model and full suspension frame model related to the mountain bike disc brake, recognize the rotor size before installing to into the bike. It's better to read the manual book and understand what should do with this fork, "is this good to place big rotor in our SR Suntour XCM?" By read it, the rider will know what the best setting for the bike.
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