Alchemy's New Arktos Combines 3 Travel Configurations & 2 Wheel Sizes in 1 Frame Mar 2, 2021 Don't have an account? Sign up The Arktos 150F/135R has a Fox 36 Factory Kashima 150mm Boost fork with a Grip 2 damper and a Fox DPX2 Factory Kashima EVOL rear shock. Alchemy Bikes's new carbon Arktos is designed to allow for three travel configurations and two wheel sizes (29” and mixed-wheel 29”/27.5” compatibility) all with one frame. That means you can purchase the Arktos with a 120mm, a 135mm or a 150mm rear end paired with a 130mm, a 150mm or a 170mm fork. The shortest travel version only comes in a 29er option, but you can get a mullet version of the longer travel 135mm or the 150mm bike.