>>1576676iirc the higher tpi tires generate less heat as they flex, so in this way they provide lower rolling resistance
but for this to work your puncture resistance will be lower, and you risk pinch flats at pressures below 30 psi
>1.9sufficient but not excellent
it carry's much of the weight and slop of a larger tire but not many of its benefits
you'll only really notice the utility of such large tires when you are dealing with 1" rocks or fine sand or riding in the wet and mud
>1.75good all rounder, thick enough to provide some comfort but also provides a good amount of grip
consider that many of the meme 700c gravel and hybrid bike tires are 38 mm this is very close to 1.5 inch tires
1.5 tires are good for speed but its a simple matter of ground pressure that they will be slightly uncomfortable (and also more vulnerable to punctures)
if your biking above 30 kph rolling resistance starts to be less significant than aerodynamic drag caused by the tire, this is part of the reason 23 and 19 mm tires were popular
etrto 32-597 is a nice size but its unlikely you'll find one
if your bike is near 13 kg you can use thinner tires
if your bike is closer to 17 kg thick tires do help
this also apply's to rider / luggage weight
each rubber compound has an ideal amount of weight for it to achieve maximum grip
and since air is a spring different volumes of it will dampen different vibrations
