Cycling bib refers to a class of bike shorts that have straps that loop over the shoulders. The advantage of this format is the reduction of pressure on the waist. This can be useful for those who do marathon riding. The only significant difference between regular bike shorts and bib are the straps and waist band. Proper fit of a cycling bib may be the key to a comfortable ride.
Shoulder Straps
When you wear your bib shorts, the straps should not dig into your shoulders. This would be an indication the bib is too small. If the straps fall as you ride, the shorts are too large. Not all manufacturers consider height as part of the sizing criteria, but from the rider's perspective, it is noteworthy. It may require trial and error to find straps that match your height.
Waist
One advantage of bib shorts is that waist size is not as much of an issue. Regular bike shorts clinch at the waist. If too small, they will pinch. Bibs secure at the shoulders and work well for riders with larger stomachs. You should be able to breathe comfortably in the appropriate-size bib shorts. If you feel cramped when riding, the bib may be too small. Sizing varies by manufacturer, so refer to the company's sizing chart for proper classifications for your waist size.
Padding
A distinctive feature of all bike shorts is the padding in the rear to help cushion the saddle. Bib shorts should center the padding correctly. If the bib is not the correct size, the strain to loop the straps around the shoulders may move the padding upward. When trying on your bib, ensure that when you bend at the waist, the padding does not move up. If the bib is too large, you will have the opposite problem and the padding will sag.
Expert Insight
It is not enough to decide that a cycling bib is the way to go. You must also select a genre bib. Manufacturers strive for distinction. Find a model that works for you and stick with it. If you prefer straps that attach across the back, that is the fashion to choose. Once you select a style, you can concentrate on the sizing issues. Comfort is the key. Try the bib shorts on at the store. While wearing the shorts, bend over and walk around. Bibs that do not move with you will not be comfortable when you ride.
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