How Do KMC ‘Stretchless’ chains Work?
Page 1 of 2 12 LastLast
Results 1 to 25 of 26
  1. #1
    Cleavage Of The Tetons
    Reputation: rideit's Avatar
    Join Date
    Feb 2005
    Posts
    920

    How Do KMC ‘Stretchless’ chains Work?

    In other words, if they don’t ‘stretch’, how does wear manifest itself?
    Seems too good to be true.

  2. #2
    Rub it............
    Reputation: frdfandc's Avatar
    Join Date
    Nov 2007
    Posts
    3,785
    Chains don't stretch. The inside of the roller wears causing elongation of the chain as it is pulled tight.

    https://www.sheldonbrown.com/chains.html

    Cyclists often speak of chain "stretch", as if the side plates of an old chain were pulled out of shape by the repeated stresses of pedaling. This is not actually how chains elongate. The major cause of chain "stretch" is wear. (See our article on chain wear for more details.)

    https://www.sheldonbrown.com/chain-wear.html

    Sounds like "Stretchless" is a gimmick. Maybe they figured out how to lengthen the life of the inside of a roller as it wears.
    Last edited by frdfandc; 03-10-2019 at 10:26 AM.
    You can't fix stupid.

    Quote Originally Posted by JoeDaddio

    I kind of wish it were legal to staple people in the face.

  3. #3
    What the what???
    Reputation: Opus51569's Avatar
    Join Date
    Jul 2009
    Posts
    10,064
    From the KMC site- FAQS - KMC Chain

    "Our chains also feature our XXSP stretch proof treatment. This is a treatment that we have perfected in our years of chain manufacturing. The stretch proof treatment is a process of heating and cooling the steel alloys to certain temperatures to yield only the strongest and hardest steel."

    But perhaps more telling is the fact that on the same FAQ page, KMC says they only warranty their chains for manufacturers defects and they handle all other claims on a case by case basis...
    The Law of Headwinds states: If the ride out is easy... wait.

  4. #4
    RoadBikeReview Member
    Reputation: nova_rider's Avatar
    Join Date
    Sep 2005
    Posts
    161
    Quote Originally Posted by rideit View Post
    In other words, if they don’t ‘stretch’, how does wear manifest itself?
    Seems too good to be true.
    Where did you see this?

  5. #5
    RoadBikeReview Member
    Reputation: velodog's Avatar
    Join Date
    Sep 2007
    Posts
    7,652
    Forever Chains, throw away your rulers.
    Too old to ride plastic

  6. #6
    RoadBikeReview Member
    Reputation:
    Join Date
    Oct 2013
    Posts
    3,031
    I'll have to change my will again, that chain is going to last more than one!
    BANNED

  7. #7
    Adorable Furry Hombre
    Reputation: Marc's Avatar
    Join Date
    Jan 2005
    Posts
    27,595
    Quote Originally Posted by velodog View Post
    Forever Chains, throw away your rulers.
    Does DeBeers make Good Chains?
    "Refreshingly Unconcerned With The Vulgar Exigencies Of Veracity "

  8. #8
    'brifter' is a lame word.
    Reputation: cxwrench's Avatar
    Join Date
    Nov 2004
    Posts
    14,016
    Quote Originally Posted by rideit View Post
    In other words, if they don’t ‘stretch’, how does wear manifest itself?
    Seems too good to be true.
    Roller wear, pin wear, bushing wear. Chains 'elongate' not stretch. If the plates actually stretched the holes for the pins would get bigger and everyone's chains would fall apart. Cables don't stretch either.
    I work for some bike racers
    I've got some bikes, some guns,
    and a bunch of skateboards

  9. #9
    Cleavage Of The Tetons
    Reputation: rideit's Avatar
    Join Date
    Feb 2005
    Posts
    920
    Yup, all of that is 120 year old news...but how are they marketing this as a ‘new’ thing?
    Seems hinkie.

  10. #10
    RoadBikeReview Member
    Reputation: Oxtox's Avatar
    Join Date
    Aug 2006
    Posts
    10,375
    only use KMC chains (X10SL) and they routinely last 8-10K miles.

    satisfied customer.
    Ancient Astronaut theorists say, 'YES!'

  11. #11
    [REDACTED]
    Reputation: Lombard's Avatar
    Join Date
    May 2014
    Posts
    9,090
    Chain lube debate coming.....5.....4.....3....2.....1.....
    "With bicycles in particular, you need to separate between what's merely true and what's important."-- DCGriz, RBR.

    “Statistics are like bikinis. What they reveal is suggestive, but what they conceal is vital.” -- Aaron Levenstein



  12. #12
    Cleavage Of The Tetons
    Reputation: rideit's Avatar
    Join Date
    Feb 2005
    Posts
    920
    And the answer, of course, is Pro Link Gold.

  13. #13
    'brifter' is a lame word.
    Reputation: cxwrench's Avatar
    Join Date
    Nov 2004
    Posts
    14,016
    Quote Originally Posted by rideit View Post
    Yup, all of that is 120 year old news...but how are they marketing this as a ‘new’ thing?
    Seems hinkie.
    Probably like the new SRAM AXS chains, they're supposed to last a loooong time due to how hard they are. We'll see.
    I work for some bike racers
    I've got some bikes, some guns,
    and a bunch of skateboards

  14. #14
    [REDACTED]
    Reputation: Lombard's Avatar
    Join Date
    May 2014
    Posts
    9,090
    Quote Originally Posted by cxwrench View Post
    Probably like the new SRAM AXS chains, they're supposed to last a loooong time due to how hard they are. We'll see.
    But as always, YMMV.
    "With bicycles in particular, you need to separate between what's merely true and what's important."-- DCGriz, RBR.

    “Statistics are like bikinis. What they reveal is suggestive, but what they conceal is vital.” -- Aaron Levenstein



  15. #15
    RoadBikeReview Member
    Reputation:
    Join Date
    Oct 2013
    Posts
    3,031
    Well if they start making chains harder.... guess what... your chainrings & cassettes are now the wear item.
    BANNED

  16. #16
    'brifter' is a lame word.
    Reputation: cxwrench's Avatar
    Join Date
    Nov 2004
    Posts
    14,016
    Quote Originally Posted by duriel View Post
    Well if they start making chains harder.... guess what... your chainrings & cassettes are now the wear item.
    Unless you also harden them and change the shapes a little bit. And...if the chain doesn't wear how will the cogs and rings wear? You need to have chain wear to have wear on the other parts. Like I said...we'll see.
    I work for some bike racers
    I've got some bikes, some guns,
    and a bunch of skateboards

  17. #17
    RoadBikeReview Member
    Reputation: velodog's Avatar
    Join Date
    Sep 2007
    Posts
    7,652
    Quote Originally Posted by cxwrench View Post
    Probably like the new SRAM AXS chains, they're supposed to last a loooong time due to how hard they are. We'll see.
    Not to stretch a point.
    Too old to ride plastic

  18. #18
    tlg
    tlg is offline
    RoadBikeReview Member
    Reputation: tlg's Avatar
    Join Date
    May 2011
    Posts
    14,038
    Quote Originally Posted by Opus51569 View Post
    From the KMC site- FAQS - KMC Chain

    [I]"Our chains also feature our XXSP stretch proof treatment. This is a treatment that we have perfected in our years of chain manufacturing. The stretch proof treatment is a process of heating and cooling the steel alloys to certain temperatures to yield only the strongest and hardest steel."
    They also say:

    "KMC’s eXtreme Stretch Proof treatment of pins and plates makes this chain less susceptible to wear caused by sand or dirt entering the chain bearings."

    The telling point "less susceptible to wear. Which means they "are" susceptible to wear. Thus... not stretch proof but "stretch resistant".
    Custom Di2 & Garmin/GoPro mounts 2013 SuperSix EVO Hi-MOD Team * 2004 Klein Aura V

  19. #19
    RoadBikeReview Member
    Reputation: velodog's Avatar
    Join Date
    Sep 2007
    Posts
    7,652
    Quote Originally Posted by tlg View Post
    They also say:

    "KMC’s eXtreme Stretch Proof treatment of pins and plates makes this chain less susceptible to wear caused by sand or dirt entering the chain bearings."

    The telling point "less susceptible to wear. Which means they "are" susceptible to wear. Thus... not stretch proof but "stretch resistant".
    Marketing speak.

    Most highly, if someone doesn't understand that they probably don't think about their chain anyway. At least until it's so noisy that they can't even carry on a conversation, or a shop mechanic tells them that the drivetrain is wore out and it all needs replacing.
    Too old to ride plastic

  20. #20
    gazing from the shadows
    Reputation: QuiQuaeQuod's Avatar
    Join Date
    Jan 2003
    Posts
    26,331
    Quote Originally Posted by cxwrench View Post
    And...if the chain doesn't wear how will the cogs and rings wear?
    More slowly?

    Friction exists.

    Asymmetrical friction exists for each and every tooth.
    .
    Stout beers under trees, please.

  21. #21
    [REDACTED]
    Reputation: Lombard's Avatar
    Join Date
    May 2014
    Posts
    9,090
    Quote Originally Posted by QuiQuaeQuod View Post
    More slowly?

    Friction exists.

    Asymmetrical friction exists for each and every tooth.
    This is what I was thinking. Metal against metal, one or both surfaces must eventually lose material.
    "With bicycles in particular, you need to separate between what's merely true and what's important."-- DCGriz, RBR.

    “Statistics are like bikinis. What they reveal is suggestive, but what they conceal is vital.” -- Aaron Levenstein



  22. #22
    RoadBikeReview Member
    Reputation:
    Join Date
    Feb 2002
    Posts
    20,964
    Quote Originally Posted by rideit View Post
    Seems hinkie.
    That's because, in a word, it is.

  23. #23
    RoadBikeReview Member
    Reputation: nova_rider's Avatar
    Join Date
    Sep 2005
    Posts
    161
    Quote Originally Posted by Lombard View Post
    This is what I was thinking. Metal against metal, one or both surfaces must eventually lose material.
    It's more like metal against grits against metal. Metal to metal only exist perhaps for the first 100ft of a ride on a brand new chain. Encase the entire drivetrain in oil would certainly prolong the life of mechanical components, but that is not exactly practical for bicycles and cyclists.

  24. #24
    [REDACTED]
    Reputation: Lombard's Avatar
    Join Date
    May 2014
    Posts
    9,090
    Quote Originally Posted by nova_rider View Post
    It's more like metal against grits against metal. Metal to metal only exist perhaps for the first 100ft of a ride on a brand new chain. Encase the entire drivetrain in oil would certainly prolong the life of mechanical components, but that is not exactly practical for bicycles and cyclists.
    Grit certainly doesn't help, but most of that gray "dirt" you wipe off your chain are fine metal fragments that came off your chain, cogs and rings.
    "With bicycles in particular, you need to separate between what's merely true and what's important."-- DCGriz, RBR.

    “Statistics are like bikinis. What they reveal is suggestive, but what they conceal is vital.” -- Aaron Levenstein



  25. #25
    RoadBikeReview Member
    Reputation:
    Join Date
    Feb 2002
    Posts
    20,964
    Quote Originally Posted by Lombard View Post
    Grit certainly doesn't help, but most of that gray "dirt" you wipe off your chain are fine metal fragments that came off your chain, cogs and rings.
    Beg to differ. When I ride the rollers during the winter, I put on a couple of thousand miles and the chain develops minimal black gunk, doesn't need lubrication (remains quiet and smooth), and wears very little. My dedicated roller bike has over 10K miles on the chain indoors and it had a full outdoor season on it before it became a roller bike.

    Out on the road, I need to do my home brew clean-lube routine every 350-400 miles before the chain starts making noise. It is the road grit that is the source of the black gunk and therefore the primary cause of wear.

Page 1 of 2 12 LastLast

Similar Threads

  1. KMC 11SL chain and KMC Missing Link?
    By ejr13 in forum Campagnolo
    Replies: 11
    Last Post: 01-17-2011, 12:25 AM
  2. Sram chain link won't work with KMC and DA chains...I think
    By dasho in forum General Cycling Discussion
    Replies: 5
    Last Post: 02-29-2008, 06:41 AM
  3. KMC chains and cassettes
    By mercurymike in forum General Cycling Discussion
    Replies: 9
    Last Post: 01-09-2008, 09:38 AM
  4. KMC 10-speed chains $22 @ Performance
    By drewmcg in forum Hot Deals
    Replies: 2
    Last Post: 08-07-2007, 04:01 AM
  5. KMC Gold Chains
    By Ricky J in forum Components, Wrenching
    Replies: 4
    Last Post: 02-11-2007, 05:58 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

THE SITE

ABOUT ROADBIKEREVIEW

VISIT US AT

© Copyright 2019 VerticalScope Inc. All rights reserved.