One of the greatest weaknesses in a bicycles design is the wheel. One sharp bite from a stray shard of glass, thorn, or metal, and it can ruin your ride. Even the more prepared that carry extra tubes or flat repair patches and such still lose the time spent. Fragile spokes, complicated wheel building, and rims that even with a good tire can get wrecked at the edge of a water filled pothole, curb or tree root. It is not uncommon to see a bike accident due to a tire, or wheel failure. Hopefully those days soon will be over...