I’ve run Continental Speed Ride tires for 5 years. I haven’t had a flat with them, though that's probably just luck. They only come in one size - 622 x 42. I run them on my Sam at 55 psi. They cost about $25. The last set went over 5000 miles. I tried the Schwalbe Marathon 622x37 at 65 psi for a year. It was like riding through mud - they weigh a lot more than the Speed Rides, but if I were doing touring, they would be my choice.
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