Vintage 1984/85 Vitus Dural 979 23 Alloy Bonded Road Bike Bicycle Shimano 600 Posted November 25, 2023 Vintage 1984/85 Vitus Dural 979 23 Alloy Bonded Road Bike Bicycle Shimano 600Centre of seat tube to centre of head tube: 22. Centre of BB to top of seat tube: 23.