This length (measured from the bottom of the racket) represents the point at which the racket can be balanced without tipping either way so the higher the number, the heavier the racket is towards the head. An evenly balanced racket of standard length (27 inches / 686 mm) would have a balance point of roughly 343 mm.
The length of a tennis racquet is another characteristic that varies between frames. Most ...
More Standard Men's Tennis Racket Size images
Standard Adult Size: 27'' 69 cm: Best choice for most players: Extra Long Adult Size: 28'' 71 cm: More momentum, less control
Here's a look at the racquet sizes available and the best way to measure which is best for you. 19-, 21- and 23-inch racquets. These are all generally youth racquets for players age 8 and under. 23- and 25-inch racquets. These are generally best for the 9-10-year-old age group. 26-inch racquets
Standard adult tennis rackets are 27″ in length. This length provides a good balance between mobility and stability. If a racket is shorter than 27 inches, it will offer greater speed but less stability.
Many men looking for tennis racquets will find themselves choosing between a size 3 (4 3/8 in) and size 4 (4 1/2 in) grip. If you’re on the fence between the two, I’d encourage you to go with 4 3/8 because it’s much easier to build up a grip than reduce it and the difference between the two is only 1/8 inch or 3.2 mm.