Shaft flex and swingweights??? | Golf Monthly

Cuts from True Temper website,

"That is why you'll see flex designations like R200, R300, R400, etc. Weight is the major difference -- 200 is lighter, 400 is heavier. R300, S300, X100 are the standard flexes. About 3 grams is the actual weight difference. For example an R200 may play a little more flexible than the R300 and the R400 may play a little stiffer than the R300 only because of the weight."

What is 'Swing-weighting'?

The swing-weight of a club is the balance of the overall weight of the club. The higher the swing-weight the more the weight is distributed towards the club end and vice versa. Standard swing-weight for men is D-0 to D-2 for women it is C-7 to C-9.

Basic swing-weight rules: every 2 grams added to head weight = 1 s/w; every 7 grams of shaft weight = 1 s/w; every 4 grams of grip weight = 1 s/w ; every 1/2" over length = 3 s/w. To increase swing-weight, either 1) lengthen the club, 2) add weight to the head, or 3) use a heavier shaft. To decrease swing-weight, either 1) shorten the club, 2) add weight to the butt end, or 3) use a lighter shaft.