There are two brake mount options in the hub world: Six Bolt and Center lock. In general, Six Bolt is the prefered brake mount for most mountain bike applications however certain disciplines like XC and Gravel often utilize a Center Lock setup. Center Lock shaves a bit of weight but can come at a durability sacrifice. For higher speed riding or on technical terrain, we recommend a six bolt setup. If you are riding long distances on gravel or building up a weight conscious XC or trail bike and you are less worried about durability, we'd recommend going with a Center Lock setup.