Chain Ring questions

Discussion in 'Cycling Equipment' started by warriorcliff77, Aug 16, 2007.

  1. warriorcliff77

    warriorcliff77 New Member

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    Hi all,

    Looking on ebay for a smaller chainring for the front. My question is regarding the bolt circle. Do all chainrings have the same bolt circle for mounting, or does it depend on what kind i have?
     
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  2. strummer_fan

    strummer_fan New Member

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    http://www.sheldonbrown.com/gloss_bo-z.html#bcd

    Scroll down for a brand / BCD index.
     
  3. to106

    to106 New Member

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    How oten does a Chain need to be replaced?

    I hear anywhere from 2000KM up to 5000KM.
     
  4. tafi

    tafi Member

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    Any suggested replacement interval is just that... a suggestion which has no basis in science.
    Buy a chain checker and use it regularly. If you throw the chain between 0.5% and 1% "stretch" you can will get more life from the cassette.
    Rings rarely need changing.
     
  5. capwater

    capwater New Member

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    +1 on measuring a chain, far too many variables to put a mileage tag on it. Decent rule of thumb is if you change your chain when required you can get about 4 cycles out of a cassette. Your chainrings will last far longer, check for a "shark fin" appearance. Also, 10 speed chains will wear faster than 9 speeders.
     
  6. warriorcliff77

    warriorcliff77 New Member

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    Figured i'd post my gearing and see if i'm just a wuse, or if anyone would recommend a change for me.

    front: 40,52
    Rear: old 7speed 13 to 24

    I'm looking for an easier granny gear....
    My LBS told me that my style of cassette is pretty much impossible to update.

    Thanks
     
  7. Scotty_Dog

    Scotty_Dog New Member

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    This information was already given to you last month.

    http://www.cyclingforums.com/t404797.html

    Replace your small chainring or your cassette, the choice is yours.
     
  8. warriorcliff77

    warriorcliff77 New Member

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    Thanks mom for finding my old post( i am a newb, remember...)

    But if you noticed, i didn't have my gearing specs, and now i do. Aso i can't change anything on the cassette, hence my new post regarding FRONT chainrings.
     
  9. Scotty_Dog

    Scotty_Dog New Member

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    In both this and the past post I referenced, you were shown how and where to purchase either a new front chainring or new 7 speed cassettes. Both options have the potential to lower your current gearing.

    Why can't you change your cassette? 7 speed cassettes are readily available.
     
  10. warriorcliff77

    warriorcliff77 New Member

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    Scotty: no disrepect intended. I'm just extremely frustrated with my LBS.

    I'm simply stating what my LBS told me. Maybe if i explain how it comes off, it might shed some light: to remove my cassette i need 2 chain whips, and "unscrew" the smallest sprocket. Then the rest of the sprockets come off. I don't use a "removing" tool like my mountain bike cassette.

    Further reading from your reference would indicate that i have a : "Uniglide cassettes are no longer available"
     
  11. Scotty_Dog

    Scotty_Dog New Member

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    Ok, sounds like you have a Uniglide cassette: http://sheldonbrown.com/k7.html#uniglide
    If you read it, you'll discover that you could transplant a Hyperglide freehub body onto your current hub. That way, you could use the vast array of Hyperglide cassettes. Also, you could grind off the wide spline on a Hyperglide sprocket to make it fit a Uniglide freehub.

    Or replace your front chainring.
     
  12. warriorcliff77

    warriorcliff77 New Member

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    Thanks for all your help.

    One last quetion for you:
    is the 40 52 common? or am i just week in the legs..... I find i'm rarely on the 52 except on a few flat sprints.
     
  13. Scotty_Dog

    Scotty_Dog New Member

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    I don't know.

    If you don't like the 40 or 52, change them.
     
  14. kdelong

    kdelong Well-Known Member

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    40T-52T are fairly common. You may be a little weak in the legs if you really are a newb as you said. It takes a little time to work up leg strength to the point that you can efficiently push the higher gears.
     
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