Note that the inch-based designations sometimes express the width in a decimal (26 x 1.75) and sometimes as a common fraction (26 x 1 3/4). This is the most common cause of mismatches. Although these size designations are mathematically equal, they refer to different size tires, which are NOT interchangeable.
Stomach bloating may at times occur immediately after a meal, within minutes or in rare cases while eating. The most common cause for this is due to air swallowing (aerophagia) or consuming carbonated drinks. In both these cases, it can be avoided to a large extent.
In my experience, bloating and distention soon after eating means only one thing: you've eaten and wrong foods and combined them improperly. Mis-food combining can create havoc in the body: gas, distention, even cramping, D, and bleeding too.