Answer BMX Carbon Rim (451 - 20x1-1/8)Looking to build the ultimate race bike? Then there's no doubt that you will be running carbon rims and here are their options for your mini, junior or expert bike. Available with a braking service and without (non braking) surface, these rims are not only super strong and stiff, they are light! We've built hundreds of BMX race wheels with carbon rims and we very rarely ever see them fail, or buckle. Their ability to take big hits astounds us, and