Page 1 of 2 1 2 LastLast
Results 1 to 25 of 45

Thread: Chain Stretch

  1. #1
    mtbr member
    Reputation:
    Join Date
    Jan 2009
    Posts
    350

    Chain Stretch

    Vertical drop-outs; no chain tensioner; no eccentric bottom bracket -- how long can I run this set up before I can expect chain stretch* to give me problems?

    *short hand for increase in distance between pins due to chain wear (so relax).
    Last edited by Canaan; 10-04-2010 at 09:51 AM.

  2. #2
    Mtbr Forum Sponsor - Homebrewed Components
    Reputation:
    Join Date
    Jul 2006
    Posts
    2,421
    depends on how loose it is to start. You might not have any problems at all if it was borderline tight when you started.

  3. #3
    mtbr member
    Reputation:
    Join Date
    Jan 2009
    Posts
    350
    Thanks for the quick reply -- that's what I was hoping to hear, and given the links in your signature block I have the feeling you know what you're talking about.

  4. #4
    mtbr member
    Reputation:
    Join Date
    Jan 2009
    Posts
    471
    Quote Originally Posted by ISuckAtRiding
    depends on how loose it is to start. You might not have any problems at all if it was borderline tight when you started.
    Also is somewhat dependent on your riding style and weight. Hammertime and fat ass = more chain stretch than putzing around town and waif.

  5. #5
    mtbr member
    Reputation:
    Join Date
    Jan 2009
    Posts
    350
    Quote Originally Posted by markj2k4
    Also is somewhat dependent on your riding style and weight. Hammertime and fat ass = more chain stretch than putzing around town and waif.
    Thanks -- I'm somewhere between hammertime/fat ass and p.a.t/waif. I'm 6'0"-170 lbs and use this rigid SS to fool around on neighborhood single track with mild climbs when I get tired of riding my full-suspension xc bike.
    Last edited by Canaan; 10-01-2010 at 09:53 AM.

  6. #6
    mtbr member
    Reputation:
    Join Date
    Apr 2009
    Posts
    143
    I'm in the same boat as you... I figure who cares? SS chains are pretty cheap $5 or $9 if you want a sweet color

  7. #7
    L09erdr
    Guest
    Some chains dont stretch. Depends on your chain and other factors mentioned already in this post. You really shouldnt worry about chain stretch. Over time it will happen if your chain isnt stretch proof but if and when it does happen doesnt mean your drivetrain is going to be a problem.

  8. #8
    Ovaries on the Outside
    Reputation: umarth's Avatar
    Join Date
    Dec 2007
    Posts
    4,359
    Why does everyone hate tensioners so much?

  9. #9
    Mtbr Forum Sponsor - Homebrewed Components
    Reputation:
    Join Date
    Jul 2006
    Posts
    2,421
    Quote Originally Posted by umarth
    Why does everyone hate tensioners so much?
    they were responsible for the black plauge and AIDS. If you have a tensioner, please use a condom.

    But in all reality, yea, never had a problem with mine. I actually had less issues with it than some singlespeed specific frames, to be honest.

  10. #10
    mtbr member
    Reputation:
    Join Date
    Jan 2009
    Posts
    350
    Quote Originally Posted by umarth
    Why does everyone hate tensioners so much?
    It's not so much that I hate them, but when I tweaked the one I had on the bike, I thought I'd try to get a "cleaner" look by setting the bike up without one. The Surly tensioner looks nice, but this is a budget build and I don't want to drop $35 - $40 on one.

  11. #11
    PSYCHOLUST
    Reputation: scyule's Avatar
    Join Date
    Nov 2009
    Posts
    479
    Chain STRETCH is actually chain WEAR
    The standard way to measure chain wear is with a ruler or steel tape measure. This can be done without removing the chain from the bicycle. The normal technique is to measure a one-foot length, placing an inch mark of the ruler exactly in the middle of one rivet, then looking at the corresponding rivet 12 complete links away. On a new, unworn chain, this rivet will also line up exactly with an inch mark. With a worn chain, the rivet will be past the inch mark.
    This gives a direct measurement of the wear to the chain, and an indirect measurement of the wear to the sprockets:

    •If the rivet is less than 1/16" past the mark, all is well.
    •If the rivet is 1/16" past the mark, you should replace the chain, but the sprockets are probably undamaged.
    •If the rivet is 1/8" past the mark, you have left it too long, and the sprockets (at least the favorite ones) will be too badly worn. If you replace a chain at the 1/8" point, without replacing the sprockets, it may run OK and not skip, but the worn sprockets will cause the new chain to wear much faster than it should, until it catches up with the wear state of the sprockets.
    •If the rivet is past the 1/8" mark, a new chain will almost certainly skip on the worn sprockets, especially the smaller ones

    God Bless Sheldon Brown

  12. #12
    is buachail foighneach me
    Reputation: sean salach's Avatar
    Join Date
    Sep 2007
    Posts
    5,840
    Chains, as a single unit, do stretch. This stretch is caused by the wearing of individual components of the chain. To stretch is simply to elongate, and since it has become longer, a worn chain has stretched, by definition.

    http://www.thefreedictionary.com/stretch

  13. #13
    mtbr member
    Reputation:
    Join Date
    Aug 2007
    Posts
    4,673
    Quote Originally Posted by sean salach
    Chains, as a single unit, do stretch. This stretch is caused by the wearing of individual components of the chain. To stretch is simply to elongate, and since it has become longer, a worn chain has stretched, by definition.

    http://www.thefreedictionary.com/stretch
    The elongation is not from actually stretching the chain. It hasn't stretched at all, it has merely increased the play in the pins. You can still compress the chain back down.

  14. #14
    mtbr member
    Reputation:
    Join Date
    Jun 2005
    Posts
    1,249
    Quote Originally Posted by Schmucker
    The elongation is not from actually stretching the chain. It hasn't stretched at all, it has merely increased the play in the pins. You can still compress the chain back down.
    I'm with this guy. I hate the term chainstrech.
    Anyway, back on topic...I ran an Imperial with no tensioner, and my chain was tight with a new chain. I went thru 2-3 chains a summer, 3ish rides a week. Because I think chains wear and get longer, not actually strech, I think weight and leg strength have less to do with lifespan then keeping it clean and lubed. IMO.

  15. #15
    mtbr member
    Reputation: djriddle's Avatar
    Join Date
    Oct 2008
    Posts
    138
    In the shop we refer to this as wear. We don't say 'your chain stretched, you need a new one' we say 'you've worn out the chain you handsome sunnova***** with those tree trunks you call legs!'
    BBI certified, 12+ years as mechanic

  16. #16
    is buachail foighneach me
    Reputation: sean salach's Avatar
    Join Date
    Sep 2007
    Posts
    5,840
    Quote Originally Posted by Schmucker
    The elongation is not from actually stretching the chain. It hasn't stretched at all, it has merely increased the play in the pins. You can still compress the chain back down.

    All 'stretch' means is that the object in question got longer. The chain itself, taken as one whole unit, has stretched when it is longer than it once was. The links of a chain don't stretch, and the individual pins and rollers don't either, they wear, but the combined effect of all those worn pins and rollers is, by definition, a stretched chain.

    A bungee cord can return to it's original length, despite being stretched.

  17. #17
    Mtbr Forum Sponsor - Homebrewed Components
    Reputation:
    Join Date
    Jul 2006
    Posts
    2,421
    and all this time i thought they actually stretched limos. boy do i feel quite the fool.

  18. #18
    mtbr member
    Reputation:
    Join Date
    Jan 2009
    Posts
    350
    Quote Originally Posted by sean salach
    All 'stretch' means is that the object in question got longer. The chain itself, taken as one whole unit, has stretched when it is longer than it once was. The links of a chain don't stretch, and the individual pins and rollers don't either, they wear, but the combined effect of all those worn pins and rollers is, by definition, a stretched chain.

    A bungee cord can return to it's original length, despite being stretched.
    Thank you for interjecting a little common sense. Everyone knows that "chain stretch" refers to a worn-out chain -- fortunately only a few need to demonstrate how clever they are with somewhat condescending posts.

  19. #19
    mtbr member
    Reputation:
    Join Date
    Aug 2007
    Posts
    4,673
    Quote Originally Posted by sean salach
    All 'stretch' means is that the object in question got longer. The chain itself, taken as one whole unit, has stretched when it is longer than it once was. The links of a chain don't stretch, and the individual pins and rollers don't either, they wear, but the combined effect of all those worn pins and rollers is, by definition, a stretched chain.

    A bungee cord can return to it's original length, despite being stretched.
    Those two things are nothing alike. A bungee cord stretches because the elastomers have been reoriented within the material to have that elongation, but they maintain their chemical binding. The material has actually deformed. A chain, however, "stretches" from moving the links further apart from the space available. You're just moving parts around. There is no deformation. What you're saying is that having to blocks next to each other, and then moving them apart, you've now stretched the blocks.

  20. #20
    Ken
    Ken is offline
    Ye Olde Phartt
    Reputation: Ken's Avatar
    Join Date
    Mar 2005
    Posts
    60
    $10 KMC Z410s only last me about 10 hours before they get floppy. Then I put the Singleator on and squeeze out a few more rides. I think the Florida sand is the main culprit for the excessive wear.

    I switched to KMC Z610's which are lasting much longer but still require a tensioner after a few weeks. I am using a Surly stainless ring and cog which don't seem to affected by the chain wear.

  21. #21
    fresh fish in stock...... SuperModerator
    Reputation: CHUM's Avatar
    Join Date
    Aug 2004
    Posts
    8,210
    as mentioned above ^^

    some chains wear faster than others....

    a SRAM PC1 is basically a nickle coated limp noodle...vs. the SRAM PC-7X which will last the better part of a hard riding season....
    Visit these 2 places to help advance trail access:
    http://www.sharingthepct.org/
    http://www.facebook.com/SharingThePct

  22. #22
    is buachail foighneach me
    Reputation: sean salach's Avatar
    Join Date
    Sep 2007
    Posts
    5,840
    Quote Originally Posted by Schmucker
    Those two things are nothing alike. A bungee cord stretches because the elastomers have been reoriented within the material to have that elongation, but they maintain their chemical binding. The material has actually deformed. A chain, however, "stretches" from moving the links further apart from the space available. You're just moving parts around. There is no deformation. What you're saying is that having to blocks next to each other, and then moving them apart, you've now stretched the blocks.

    Nope, that's not what I'm saying. A chain is one, single unit. It's made up of many components. None of those components stretch under normal use. Those components wear down under normal use. This results in the chain, as a single unit, becoming longer. This is the definition of the word 'stretch', becoming longer. 'Stretch' does not apply strictly to elasticity.

    "stretch (strch)
    v. stretched, stretch·ing, stretch·es
    v.tr.
    1. To lengthen, widen, or distend: stretched the sweater out of shape.
    2. To cause to extend from one place to another or across a given space: stretched the banner between two poles.
    3. To make taut; tighten: stretched the tarpaulin until it ripped.
    4. To reach or put forth; extend: stretched out his hand.
    5.
    a. To extend (oneself or one's limbs, for example) to full length: stretched her calves before running.
    b. To extend (oneself) when lying down: she stretched herself out on the couch.
    c. To put to torture on the rack.
    6. To wrench or strain (a muscle, for example).
    7.
    a. To extend or enlarge beyond the usual or proper limits: stretch the meaning of a word.
    b. To subject to undue strain: to stretch one's patience.
    8.
    a. To expand in order to fulfill a larger function: stretch a budget; stretch a paycheck.
    b. To increase the quantity of by admixture or dilution: stretch a meal by thinning the stew.
    9. To prolong: stretch out an argument.
    10. Informal To fell by a blow: stretched his opponent in the first round.
    v.intr.
    1. To become lengthened, widened, or distended.
    2. To extend or reach over a distance or area or in a given direction: "On both sides of us stretched the wet plain" (Ernest Hemingway).
    3. To lie down at full length: stretched out on the bed.
    4. To extend one's muscles or limbs, as after prolonged sitting or on awakening.
    5. To extend over a given period of time: "This story stretches over a whole generation" (William Golding).
    n.
    1. The act of stretching or the state of being stretched.
    2. The extent or scope to which something can be stretched; elasticity.
    3. A continuous or unbroken length, area, or expanse: an empty stretch of highway.
    4. A straight section of a racecourse or track, especially the section leading to the finish line.
    5.
    a. A continuous period of time.
    b. Slang A term of imprisonment: served a two-year stretch.
    c. Informal The last stage of an event, period, or process.
    6. Baseball A movement in which a pitcher, standing with the glove side facing home plate, raises both hands to the height of the head and then lowers them to the chest or waist for a short pause before pitching the ball. It is used as an alternative to a wind-up, especially when runners are on base.
    adj.
    1. Made of an elastic material that stretches easily: stretch pants.
    2. Of, relating to, or being a vehicle, such as a limousine or passenger jet, having an extended seating area that provides extra space for more passengers, leg room, or amenities."

  23. #23
    mtbr member
    Reputation:
    Join Date
    Sep 2005
    Posts
    97
    to the really smart dudes who love to tell others that chains don't stretch, maybe you could also tell me what the following two words mean

    (1) idiom
    (2) pedant

    thanks a million

  24. #24
    mtbr member
    Reputation:
    Join Date
    May 2006
    Posts
    463
    Those guys need to get out and meet some girls...

  25. #25
    mtbr member
    Reputation:
    Join Date
    Sep 2009
    Posts
    68
    I knew when Canaan typed

    "*short hand for increase in distance between pins due to chain wear (so relax)"

    it was time to grab the ZIG ZAGs, roll a nice one, crank on some Dark Side of the Moon and settle in for a nice literary trip down ego lane.

    I am so stoned now I am willing to bet you that my chain is stretched longer than yours if I wear it or not.

Page 1 of 2 1 2 LastLast

Posting Permissions

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