There are no dedicated mountain biking trails in Great Smoky Mountain National Park . While you can bike on any park road, many are unsuitable because they are narrow, steep, and clogged with cars. The best biking experience is the 11-mile Cades Cove Loop , which is closed to vehicular traffic until 10 a.m. on Wednesday and Saturday mornings from May to September.
You can rent bikes ($4) during the summer and fall from the Cades Cove store (865/448-9034), which is open daily 9 a.m.–5 p.m., with a 7 a.m. opening time on Wednesday and Saturday during the biking season.
Bikes are not allowed on park trails, with the exception of the Gatlinburg Trail , Oconaluftee River Trail, and the Deep Creek Trail. Less-traveled park roads that are usually good for biking are Greenbrier  and Tremont Roads.
In the state of Tennessee, all children 16 years and younger are required to wear a helmet when they ride a bike. Adults are encouraged to do so as well.