Originally Posted by
greatscott
I think 45 is too big for road touring. I just bought a new touring bike and it came with 45's, but my last touring bike used 32 it was fine, so I will be getting 38's for this new bike as soon as they come back in stock. I will probably go with Schwalbe Marathon Almotion, they had the lowest rolling resistance of all the touring tires tested, but they only weigh around 10 grams more than the Superiors, but that's probably because the Almotion has more tread thickness than a Superior. The Almotion has a bit of tread to it so it can be used in dirt and gravel without worries.
I would tend to agree all in all. Although it really does "depend" on lots of factors, but I've been really happy also with 38,40 range for paved touring and being wider than a 32 lets say, is nice when going over rough roads, gravel or dirt trails.
Tires certainly vary so much in weight and rolling resistance, so the width number isn't the whole thing.