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Po-
Mine are 24 but it will depend on whether it's height or width that's your '23mm' limiting factor. If you're just cruising around then I'd just grab Durano (Durano Plus if you want crazy durable). I've got so many old tyres though I just dive into my tyre box and pick one when something wears out. :) I've got a 28 just lying outside with a bit of life left I need to bin but I hate throwing out stuff that's not dead dead.
hippy
On what surface and what type of 100km?
I would use a very different 23C for a fixed gear crit vs. a fixed gravel ride. Silly example but you get the idea.
If the roads are UK roads and speed isn't an issue I'd run a Durano or maybe a Michy Endurance. If I wanted something a bit quicker I still have 23C Rubinos kicking around, cobbles I'd use Paves, GP4000S are quick.