Designed for tall riders and available in only 2XL and 3XL sizes, Zinn introduces the Megabike, an aluminum full-suspension 29er. While 29er hardtails had existed for some time (and Zinn Cycles had made many of them), full-suspension 29ers were a rarity at the time. And when the 5-inch-travel Gigabike followed, it was the longest-travel 29er on the market.