HED Belgium G Rim - 650b Disc Black 28hHED Belgium G Rim 650b Disc Black 28h. HED Belgium G rims were designed to build the ultimate gravel riding wheel. Featuring a 25mm internal 30mm external width the Belgium G rims go to the next level of wide designed to suit a variety of tire options and gravel conditions. Versatility and quality thats the HED standard. Belgium rims feature a welded rim joint and are drilled for a standard Presta valve Spoke drilling is down the centerline of the rim