Do You Pre-stretch Polys?

Discussion in 'Strings' started by BigT, Apr 9, 2008.

  1. BigT

    BigT Professional

    Joined:
    Nov 6, 2006
    Messages:
    1,219
    Why Or Why Not?
     
    #1
  2. BigT

    BigT Professional

    Joined:
    Nov 6, 2006
    Messages:
    1,219
    at a few pro tourneys (Vegas and Indian Wells), I saw some stringers pre-stretching, others not. Whats the deal???
     
    #2
  3. Tim W

    Tim W Rookie

    Joined:
    Feb 10, 2008
    Messages:
    304
    Maybe some pros want their strings pre-stretched. The only thing I pre-stretch is Gut.
     
    #3
  4. miniRafa386

    miniRafa386 Hall of Fame

    Joined:
    Jun 10, 2007
    Messages:
    1,689
    NO. idk why, but ive heard/read everywhere, EVERYWHERE, not to prestretch it. you can prestretch anything else BUT poly. why, idk.
     
    #4
  5. TenniseaWilliams

    TenniseaWilliams Professional

    Joined:
    Mar 25, 2008
    Messages:
    984
    Location:
    Pangaea
    Try it. Some people think poly only plays well fresh. Some like it broke in. Pre-stretch skips right to very broke in. This is different than just being stiffer. Personally, I think poly is magic only if gently strung at low tensions and not pre-stretched. To each his own, but almost everyone agrees it plays noticeably different. Most also agree it is much harder on your arm to play with it well broken in (myself included)
     
    #5
  6. Wondertoy

    Wondertoy Professional

    Joined:
    Feb 22, 2006
    Messages:
    869
    Pre-stretching poly leads to premature breakage....ill advised.
     
    #6
  7. jonolau

    jonolau Legend

    Joined:
    Nov 26, 2005
    Messages:
    5,090
    Location:
    Singapore
    Pre-stretching will make it lose it's tensile properties, thus making the string more brittle and increases chances of snapping during play.
     
    #7
  8. BigApple

    BigApple Banned

    Joined:
    Mar 7, 2008
    Messages:
    61
    Jonolau,

    I'm curious to hear why you think that pre-stretching will make the string more brittle.

    I used to think this way, but I've come to realize that you can't really exert enough force while pre-stretching to damage the string in this way. A pre-stretch does not put enough force that would be detrimental to a poly IMO

    -BA
     
    #8
  9. jonolau

    jonolau Legend

    Joined:
    Nov 26, 2005
    Messages:
    5,090
    Location:
    Singapore
    Polyester strings are stiffer than nylon (synthetic gut). So when it's pre-stretched, this elongates it and since polyester has less elasticity, it thins it out and streches the bonds in the polymer.

    Pre-stretching puts stress on the string thus bringing it closer to threshold of its tensile strength. When you tension it a second time, it would put even more stress on the already stressed string. Add on the sudden shocks when the ball hits the string and the impact will stress the bonds even more.

    I'm talking from a commonsensical point of view, but it has also been proven to be true for customers I've done pre-stretching for.

    Using the exact same string and tension with each stringing, the pre-stretched string has lower durability and only lasts 50-70% compared to normally tensioned string.

    Hope this helps.
     
    #9
  10. bsandy

    bsandy Hall of Fame

    Joined:
    Mar 25, 2004
    Messages:
    1,990
    Isn't most of this true for Nylon and NG.

    IMO . . . Prestretching is not going to take anything more away from the string, than the first 3 or 4 good hits will.

    If you want another opinion on what Pre-Stretching does to a Poly go here . . . http://www.tennis-warehouse.com/Reviews/ALUSTR/ALUSTRReview.html

    . . . Bud
     
    #10
  11. jonolau

    jonolau Legend

    Joined:
    Nov 26, 2005
    Messages:
    5,090
    Location:
    Singapore
    It's the type of polymers used. Polyester strings are stiffer than nylon and NG and therefore have less elasticity.
     
    #11
  12. Double Fault

    Double Fault Semi-Pro

    Joined:
    Nov 17, 2007
    Messages:
    740
    Location:
    Buenos Aires, Argentina
    I just started prestretching PHT17 20% and I can't really tell the difference other than it is not as stiff. There's still plenty of bounce on the string and it does not feel dead as it usually does 1 week into the string job.
     
    #12
  13. Wondertoy

    Wondertoy Professional

    Joined:
    Feb 22, 2006
    Messages:
    869
    PolyStar , Signum Pro and Luxilon advises not to pre-stretch their polys.
     
    #13
  14. downey stringing master

    downey stringing master Semi-Pro

    Joined:
    Dec 27, 2006
    Messages:
    630
    will a 10% prestretch on a wise hurt PHT 17 ?
     
    #14
  15. BigT

    BigT Professional

    Joined:
    Nov 6, 2006
    Messages:
    1,219

    True. About 1 in 10 of my jobs pre-stretched snapped on a mishit. However, the ones that lasted played well for at least a week. The jobs not pre-stretched completely lost there control after about 3 days. Made me wonder, what's the good of a long lasting poly if it doesn't play well? Those were with Gosen Polylon SP 17.... I am thinking of trying others...any suggestions?
     
    #15

Share This Page