The right grip size makes a huge difference in how a tennis racquet performs. A too-small grip requires more muscle strength to keep the racquet from twisting in your hand. Prolonged use of a grip that's too small can contribute to tennis elbow problems. A grip that's too large inhibits wrist snap on serves, makes changing grips more difficult and also requires more muscle strength.
A tennis racquet’s grip size measures the circumference or distance around the handle, including the pre-installed stock grip, ranging from 4 inches to 4 3/4 inches. There are eight available grip sizes within that range, which start at 3 7/8 inches or a size double zero and increase by 1/8 inch for each size up to 4 3/4 inches for a size six.
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Method 1: Using a Tennis Racquet to Find Your Tennis Grip Size Place the crook in between your thumb and your index right on the tennis racket handle. An example of this is shown to... Wrap your fingers around the handle comfortably. Imagine you are gripping somebody’s hand. There’s no trick to ...
Over grips can’t fatten a grip effectively more than 1/8”, though, because each layer of over grip adds to the rounding-off of the bevel edges on your handle. Grip sizes between 4-1/8” and 4-5/8” are easy to find in adult racquets. Larger and smaller grips are made for some racquets, but not all.
The grip size is the circumference of the handle of the racket, and the size you need will therefore depend on the size of your hand. While the grip size is measured in inches, they are often converted into numbers ranging from Grip Size 0 to 5, or L0 to L5. If you already have a racket and would like to get the same grip size, you can check the base of the handle to find out which grip size it is. Grip size conversion table
The semi-wester grip falls neatly between the eastern and western and has become the most common forehand tennis grip in modern tennis because it allows for excellent topspin and quick grip changes. In the 90s and into the new millennium, players like Andre Agassi and Martina Hingis put the semi-western grip to work.
Choosing a tennis racket with the correct grip size can improve your play out on the court. You can figure out your grip size through 2 different tests. The index finger test utilizes rackets, but you can also use a ruler to measure your hand size. You can also adjust the grip size on your racket so it fits you better.
More info here: http://www.tennis-warehouse.com/LC/Gripsize.html