Originally Posted by
big john
Car tires can be dramatically different from one brand to another with the same numbers. Same with motorcycles and, obviously, bicycles. Some "run small" and others "run large" compared to the listed size.
And don't get me started on bike clothes.
The last time I was in Italy riding (2013) I was easily an XL American. Went to a high end shop and saw a really nice kit I wanted. The 3XL jersey was too small. Didn’t bother trying on the bibs. A guy in our group was a slight M American, An XL jersey he wanted was too small.