Question All motorcycles must have: Answers A rearview mirror mounted on the left handlebar. A rearview mirror mounted on the right handlebar. A rearview mirror, but only if the operator is under the age of 21. Explanation Tennessee law requires all motorcycles to have a rearview mirror mounted on the left handlebar in an upright position. This questions appears in the following tests: Tennessee Motorcycle Practice Test 13 Tennessee Motorcycle Practice Test 7