Originally Posted by
WNCGoater
So a touring bike for example, that comes with factory 40mm tires, and can handle up to a 2" tire for gravel, will it likely be able to take a 32mm (1 1/4") road tire?
The 32 mm tire should work fine. I used to have an older Trek MTB that came with 26x2.0 (559-50) semi-knobby tires. When I "streetified" it I switched to 26x1.25 (559-32) street tires and they fit the rims perfectly and rode and handled well. Your proposed size change isn't even that extreme.