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I really like Ramparts (as I keep banging on about). I've only tried 38s and 32s though. They're quick, grippy, smooth and I've not had a puncture yet after over a year of road riding and London commutes. That's with tubes. I've also only tried the Light and Supple version, not sure which one you're eyeing up. Having said that, I also like slick Gravelkings (again, very few punctures) which everyone else seems to hate .
ltc
Are Ramparts the best alternative in the 40+ tyre ball park?