Originally Posted by
jaxgtr
Some wider tires, such as 38 to 50mm for instance, can be an issue on wider internal rims width. I had issues mounting some 40's on a 25mm internal rim width, and had to use a compressor to get them to fully seat.
I haven't had a single issue in years. I've mounted tires from 28mm with 25mm internal width to 122mm and 80mm internal width. My current "road" tires are 40mm with the 25mm internal width rims. For me widths haven't factored in any way.
Of course if the tire doesn't just instantly jump up and fill some positioning might be required. And also soapy water over the bead. If you miss the soapy water a compressor might be required to mount even a good rim/tire combo.