Most of the answers have focused on the advantages of a written constitution, and clear disadvantages of an oral/unwritten one. However, the seeds of the disadvantages to a written constitution are also there. For example, it can concentrate greater power in the judicial branch that interprets it, rather than the legislature, which gets to daily decide what the constitution is when it is essentially unwritten.
Time Commitment. A treadmill can help you lose weight and tone all areas of your body, as long as you spend enough time on it. Depending on how rigorous your workout is, plan to spend between one and a half and three hours a week walking, jogging, or running.
Today most tires are pneumatic tires, though typically still referred to as just tires. The word pneumatic simply means an item that uses air. Tires work because they have tread on them. Tread is the raised patterns that appear on the top of a new tire, which often appear to zigzag around the tire. The tread helps the tire gain traction on the road to prevent it from sliding.