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chain 1000 miles, new one?

Discussion in 'Beginners' started by inaperfectworld, 26 Nov 2007.

  1. inaperfectworld

    inaperfectworld New Member

    is it a good idea to change a chain after 1000 miles: a chain costs little compared with transmission and a new chain will have manufacturers grease, which lasts a good while. does this extend transmission life
     
  2. mondobongo

    mondobongo Über Member

    Invest in one of these

    Replace chain when .75 section fits to prevent excessive wear on the drivetrain.

    As always keep your transmission clean and well lubed to prolong its life.
     
  3. piedwagtail91

    piedwagtail91 Über Member

    you can measure the links with a steel rule to decide when to change . i usually get about 1500 miles out of a chain.
    this is from sheldon brown http://sheldonbrown.com/chains.html

    Measuring 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:

    f the rivet is less than 1/16" past the mark, all is well.

    f 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.
     
  4. Agreed, replace when it gets to a level of wear, not after x miles

    Will vary depending on use (Summer/Winter ? wet/dry/muddy/dusty ? how often cleaned ? etc)
     
  5. I replaced my last chain at 1574mls (75% worn according to the Park tool), someone else on this site said they got circa 4000 miles out of a chain; so I guess we are all different and ride in conditions. So I'd agree with folk here don't go by mileage go by wear, the Park tool is simple, Life Line now do a version too or use the other methods suggested here.
     
  6. Blonde

    Blonde New Member

    Location:
    Bury, Lancashire
    You can change it now and and run another one till the same level of wear, then a third, then start with the original chain again. This is supposed to prevent having to buy a new cassette so often as you don't get the same level of mismatch in wear between chain and cassette - so chain does not skip when you put a new one on. However, it does mean you have to invest in three chains in the first place of course - though it's still cheaper than having to buy a new cassette every time you change your very worn chain.

    Level of chain wear is dependent on so many factors, including the weather you ride in and how often you clean and lube your chain, that the only good way to tell how worn it is is to measure it.
     
  7. girofan

    girofan New Member


    ;) Don't rely on the manufacturers grease. It attracts all the crap going. Clean it off when you remove it from the package. Re-lubricate with a good quality cycle chain lubricant and clean and re-apply at REGULAR intervals!:sad:
     
  8. Blonde

    Blonde New Member

    Location:
    Bury, Lancashire
    Yep - manufacturer's 'grease' is standard on engineered parts for all kinds of machines, not just bikes. It is intended simply to stop the part going rusty in the packaging/warehouse - That's all.
     
  9. goosander

    goosander Senior Member

    Location:
    Edinburgh
    Is it really worth changing chains every 1000 miles unless you are running very expensive cassettes, surely more economical to replace chain and cassette together at say 3000 miles.
     
  10. Steve Austin

    Steve Austin The Marmalade Kid

    Location:
    Mlehworld
    I've worn chins on the MTB ina couple of hundred miles. Mud tends to make them wear quicker and stretch.

    I reckon i can get 3 to 4 chains per cassette before the shifting goes sloppy.
     
  11. Blonde

    Blonde New Member

    Location:
    Bury, Lancashire
    Wow! You must have a massive chin if it touches the floor and gets worn and muddy when you're on the bike!

    Sorry, I just couldn't resist that one! :biggrin:
     
  12. goosander

    goosander Senior Member

    Location:
    Edinburgh
    I recently changed the chain & cassette on my hardtail MTB because it suddenly started jumping in 7 of the 9 gears (9 months of hard use). Despite being obviously worn, the chain still showed less than 0.75% wear on my chain checker.

    A couple of weeks earlier on my other MTB, I decided to change the chain before it wore the sprockets and found that the new chain was skipping on the old cassette despite the old chain having only stretched 1/16" over 1 foot (didn't have the chain checker then).

    My experience so far is suggesting that it is best to change chains & cassettes together as new chains just don't work well on old cassettes, and the traditional guides of when to a replace chain don't seem to work either.
     
  13. BentMikey

    BentMikey Rider of Seolferwulf

    Location:
    South London

    I'm not sure I'd agree with that, based on Sheldon's advice.
     
  14. Big T

    Big T Über Member

    Location:
    Nottingham
    Chain wear depends on when and how you use it.

    I've had chains on my summer bike (only ridden in the dry) last 3 or 4 summers. My winter bike chain will last 1 winter. My son, who rides cyclo cross, changes the chain on his cross bike twice in a 5 month season.

    Someone has suggested buying 3 chains at a time, and swapping them over every 500 miles or so, to "share" the wear between them. I've never tried this though.

    I think it also depends on how narrow the chain is. 10 speed chains don't last long at all, 9 spped last longer, 6/7/8 speed longer still.