Pretty sure I have 50mm Contact Urbans on the Surly. They came with the bike. I've just done 400 and 600k audaxes on them and while they work thought they're maybe a little -too- industrial for the road Crux.
Grand Prix Urbans are the ones you want. Basically a thicker GP with the thread design from the Contact Urban.
The ones I had were plenty grippy and didn’t suffer a single puncture with tubes
Pretty sure I have 50mm Contact Urbans on the Surly. They came with the bike. I've just done 400 and 600k audaxes on them and while they work thought they're maybe a little -too- industrial for the road Crux.