The zener al the zener al shares its all round ride capabilities with its lightweight carbon sibling the zener both models shares the same carbon fork with the befit of lightweight and carbons road vibration dampening properties the al is for aluminium our choice of frame material aluminium keeps the price down and still offers a lightweight option shimano tiagra drivetrain the shimano tiagra groupset gets a revamp for 2016 in looks design and technology following on from its older brothe