Was it already tight with 25mm as it is?
Stick to 25mm OP.
I probably will, but I think I could get at least 28s in there without much hassle.
If you're on wide rims, they measured exactly at 28mm on 19mm internal width rims (27c Open Pave).
I've heard of people running 27mm Pave's on Supersix's.
I've never tried it personally, mine was tight enough on 25s (as discussed a couple of pages ago)
@MechaMorgan started
London Fixed Gear and Single-Speed is a community of fixed gear and single-speed cyclists.
Was it already tight with 25mm as it is?
Stick to 25mm OP.