28s should fit fine, I ran 28mm Gravelkings in my 631 disc, and 32mm paselas in my 853, God I miss that frameset.
Your 631 equilibrium is in good hands :)
Have you got pics of it built up?
@Cupcakes started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
28s should fit fine, I ran 28mm Gravelkings in my 631 disc, and 32mm paselas in my 853, God I miss that frameset.