Odd duck here. My tandems generally roll with 2.2" tires. The catch is that my captan
Odd duck out here. My captains and I usually come out to around 400lbs, so my gravel tandems each roll with 2.2" regardless of the tire. This provides us the best cross between comfort and stability on a variety of gravel types. Otherwise, I have been on 28 to 35 on a variety of roads. For determining the width, base it on the comfort level of the captain and the stoker, then work down to narrower tires.