Why do they rate the swingweight so different for the same racquet?

Gee

Hall of Fame
Many times I discover on the internet different specs (esp. balance, swingweight and weight) for a certain frame.

For example I always wondered why TW ratings of the Redondo and Black Ace are different from PK.

PK mentions the following swingweight ratings (unstrung):
Redondo 98 SW: 300-312
Black Ace 98 SW: 290-300

While TW says the BA has a higher SW:
Redondo 98 : 320
Black Ace: 331

I am aware that TW ratings are strung but I still don't understand the high SW of the Black Ace. I own this frame but it definitely doesn't swing like a 330 SW but more like a 315 one (like the PK site mentions a 290 SW unstrung).

I am really confused about these different SW ratings. Can any explain this?

What I also would like to know what version is more solid. I would guess the (20 grams) heavier Redondo 'll hit more substantial.
 
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corners

Legend
Many times I discover on the internet different specs (esp. balance, swingweight and weight) for a certain frame.

For example I always wondered why TW ratings of the Redondo and Black Ace are different from PK.

PK mentions the following swingweight ratings (unstrung):
Redondo 98 SW: 300-312
Black Ace 98 SW: 290-300

While TW says the BA has a higher SW:
Redondo 98 : 320
Black Ace: 331

I am aware that TW ratings are strung but I still don't understand the high SW of the Black Ace. I own this frame but it definitely doesn't swing like a 330 SW but more like a 315 one (like the PK site mentions a 290 SW unstrung).

I am really confused about these different SW ratings. Can any explain this?

What I also would like to know what version is more solid. I would guess the (20 grams) heavier Redondo 'll hit more substantial.

You have a Black Ace 98 or two in your possession? Then you have the answer you seek. Simply use the at-home swingweight measurement method and find out for yourself. Maybe the stick you have is less than 330. Maybe the sticks TW measured were 330. Maybe PK's quality control isn't as good as they think/say it is. Published specs are one thing...which is why many people like to weigh and measure their sticks themselves.
 

corners

Legend
One thing I found interesting is that tw and twu list different specs on some.

Every single frame produced will be different than any other. TW lists strung specs from an average of 5 frames. TWU tests only one frame. Comparing them gives a good idea of how much variation we might see if we were to buy a couple of the same frame without asking for matching services.

Note that even the frames Wilson provides to Federer are only within 7-8 swingweight units of each other.
 
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