Originally Posted by zen_

35-40c is more than adequate for limestone rail-trails, but I'll be the first to admit that my opinion on tire width for gravel has evolved from 35c, to 40c, and now I'm looking at 43-45c tires. Whatever you lose in weight / aero is more than made up for with better rolling speed and comfort (which makes it easier to go faster).

I would also say do not rule out the Revolt based on how it rode from the bike shop. The OE tires Giant puts on those are garbage, and it's a totally different bike with good tires.