Tennessee Proposed Bill To Allow Motorcyclists To Ride Without A Helmet. Tennessee is one of 19 states with a helmet law. The proposed legislation would allow anyone 21 or older to ride without a helmet. A new legislation aiming to give motorcycle drivers the option of being on the road without a helmet has passed a House Finance subcommittee. The bill has some limitations. You have to be 21 years old, and be covered by private health or medical insurance. Supporters of the bill cited a Pennsylvania study showing motorcycle registrations go up after a helmet law is repealed. There are more than 167,000 motorcycles registered in Tennessee.