Jun 18, · Best Bicycles For Beginner Adults (Comparison) Diamondback Bicycles Haanjenn Tero Women’s Road Bike The first bike we have on here for beginner adults is a bicycle for women, the Haanjenn Tero produced by Diamondback Bicycles. Diamondback is a reliable name when it comesto production of road bikes. A tandem bicycle is the famous bicycle built for two. They can be fast, with the right team, but it takes practice to learn to ride one. The front rider (Captain) handles the steering and the rear rider (stoker) adds pedal power. They are great for boomer couples that want to .