[Deleted by Admins]

I can't answer wether they're all the same I'm sure they all come up with thier own forula but you can check www.bowjackson.com
for sizing .Goldtip has a sizing chart as well. Good luck I've been asking this question myself .

nubo

I know Beman and Easton size their shafts by the amount of deflection the shaft has, when a specific weight is set on the shaft that's supported at 28" between centers. A size 400 shaft deflects .400", a 340 deflects .340" and so on. The lower the number, the stiffer the shaft. Gold Tip sizes their shaft by the spine range they intend them for: 35-55 pounds is a 3555 shaft, 55-75 pounds is a 5575 shaft. Then some of 'em... who know WHAT they were thinking for their sizes. []

Too bad ATA hasn't stepped in and mandated some kind of universal sizing method.

[Deleted by Admins]

Really? Dang. Just when I thought I had stuff sorta figured out, they go and change the rules on me.[:'(][:@]

[&:]

Goldtip is only using that numbering system on their new lightweight shafts.