25 works. 28 is fine but you cannot use the forward half of the dropout because the tyre touches the brake bridge, posing a problem if you want to run double-fixed hubs with more than 1t difference on your sprocket.
whats the forward half of the dropout?
@Wallie 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.
whats the forward half of the dropout?