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Aha, that's a secret! And they're not here yet. My titanium-all-the-things Brompton is about to have a rather major rebuild so all the details will be on that thread.
I was hoping that the JK tyres would be slightly more durable than the Kojaks. I've tried Kojaks and had to take them off as the constant punctures were making me miserable, but I'm probably unwisely tempted to go for some faster and less leaden than my current Marathon Pluseseses.
which wheels did you go for?
The JK tyres are narrow, race tyres, heavier than kojaks and not as comfortable. I would not use them for much other than racing / looking the part