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Chainring replacement

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01 / Original postChainring replacementTekbuf · 11 Aug 2003 02 / This pagePosts 1–12Page 1 of 1 · chronological order 03 / Latest replyPost #12Chris Phillipo · 13 Aug 2003

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Cycling Equipment
Published
11 August 2003
Last activity
13 August 2003
Original author
Tekbuf
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12
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Public discussion
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ChainringsCranksetsReplacing chainrings

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  1. Original post
    Tekbuf
    Archived post
    #1

    I have a Sugino Impel crankset. The middle chainring has a bent tooth and cannot be straightened. I
    need to replace it. I dont see Sugino chainrings when I look at the online catalogs. I know it is a
    32 tooth ring. This is for a Gary fisher Joshua X0 mountain bike. How do I buy a replacement ring?
    Can I put a Shimano chainring in there without adverse affects? Are there good chainrings at a lower
    cost? Any recommended sources? Can I replace this myself? Thanx.

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  2. dlj0
    Archived post
    #2

    In article <[email hidden]>, [email hidden] (TekBu

    f) said:

    I have a Sugino Impel crankset. The middle chainring has a bent tooth and cannot be straightened. I
    need to replace it. I dont see Sugino chainrings when I look at the online catalogs. I know it is a
    32 tooth ring. This is for a Gary fisher Joshua X0 mountain bike. How do I buy a replacement ring?
    Can I put a Shimano chainring in there without adverse affects? Are there good chainrings at a
    lower cost? Any recommended sources? Can I replace this myself? Thanx.

    It's a standard, I presume, 94mm 5-arm crank, just like mine. There are bunches of different brands
    available cheap. You can usually get a ring for this in the $10-$15 range. Nashbar has some, but
    some of the lesser-known sites have better prices, such as Alfred E. Bike.

    David L. Johnson Department of Mathematics Lehigh University

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  3. Chris Phillipo
    Archived post
    #3

    In article <[email hidden]>, [email hidden] says...

    Quoted message said:

    I have a Sugino Impel crankset. The middle chainring has a bent tooth and cannot be straightened.
    I need to replace it. I dont see Sugino chainrings when I look at the online catalogs. I know it
    is a 32 tooth ring. This is for a Gary fisher Joshua X0 mountain bike. How do I buy a replacement
    ring? Can I put a Shimano chainring in there without adverse affects? Are there good chainrings at
    a lower cost? Any recommended sources? Can I replace this myself? Thanx.

    --
    rec.bicycles.off-road is moderated by volunteers. To find help solving posting problems, or
    contact the moderators, please see rbor.orgrbor.org Please read the charter before posting:
    rbor.orgrbor charter.txt


    What you need to know is how many bolts on the ring and measure the distance between the centers of
    two adjacent rings. Thi sis the Bolt Dead Center measurment. some Sugino ring shave been
    discontinued and will be impossible to find. I beleive they were 94mm by 4 bolts.
    --
    _________________________
    Chris Phillipo - Cape Breton, Nova Scotia ramsays-online.comramsays-online.com

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  4. Marten Hoffmann
    Archived post
    #4

    [email hidden] schreef ...

    Quoted message said:

    What you need to know is how many bolts on the ring and measure the distance between the centers
    of two adjacent rings. Thi sis the Bolt Dead Center measurment. ...

    BCD or Bolt Center Diameter

    Quoted message said:

    ... some Sugino ring shave been discontinued and will be impossible to find. I beleive they were
    94mm by 4 bolts.

    For which size about 50 different companies market chainrings ......

    --
    Regards, Marten

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  5. Andrew Webster
    Archived post
    #5

    [email hidden] (TekBuf) wrote in message news:<[email hidden]>...

    Quoted message said:

    I have a Sugino Impel crankset. The middle chainring has a bent tooth and cannot be straightened.
    I need to replace it. I dont see Sugino chainrings when I look at the online catalogs. I know it
    is a 32 tooth ring. This is for a Gary fisher Joshua X0 mountain bike. How do I buy a replacement
    ring? Can I put a Shimano chainring in there without adverse affects? Are there good chainrings at
    a lower cost? Any recommended sources? Can I replace this myself? Thanx.

    If you have a riveted crankset then you cannot easily replace individual rings. Looking at
    shop.airbomb.comintro.cfm the Sugino Impel is described as riveted
    so, unless yours is different, you cannot readily remove individual rings. You need a new crankset.
    Be sure to get one with replaceable chainrings as it gives much more flexibility in adjusting
    gearing and maintenance in future.

    You could file down the tooth to a sensible profile as an interim measure. One low tooth won't hurt
    much - look at tooth profiles of many chainrings and you will see odd low tooths to aid shifting -
    it might even be better ;-)

    If your rings are not riveted in place, but are fixed by sleeved hex bolts then any ring that fits
    will work.

    Rings are sold by numbers of arms on crank (4 or 5) and BCD or bolt circle diameter of the fixing
    bolts. Remove the old ring and measure the BCD and away you go.

    I find it easiest to lay the old ring on a sheet of paper, and mark the position of the bolt holes.
    I then use a compass to draw a circle through them and measure that.

    Sheldon Brown has tablulated distance between bolt hole centres for different BCDs if you find that
    easier (see sheldonbrown.comgloss bo z.html).

    Andrew Webster

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  6. Chris Phillipo
    Archived post
    #6

    In article <[email hidden]>, [email hidden] says...

    Quoted message said:

    [email hidden] schreef ...

    Quoted message said:

    What you need to know is how many bolts on the ring and measure the distance between the centers
    of two adjacent rings. Thi sis the Bolt Dead Center measurment. ...

    BCD or Bolt Center Diameter

    Quoted message said:

    ... some Sugino ring shave been discontinued and will be impossible to find. I beleive they were
    94mm by 4 bolts.

    For which size about 50 different companies market chainrings ......

    Find me one, please.
    --
    _________________________
    Chris Phillipo - Cape Breton, Nova Scotia ramsays-online.comramsays-online.com

    --
    rec.bicycles.off-road is moderated by volunteers. To find help solving posting problems, or contact
    the moderators, please see rbor.orgrbor.org Please read the charter before posting:
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  7. Marten Hoffmann
    Archived post
    #7

    [email hidden] schreef ...

    Quoted message said:

    In article <[email hidden]>, [email hidden] says...

    Quoted message said:

    [email hidden] schreef ...

    Quoted message said:

    What you need to know is how many bolts on the ring and measure the distance between the
    centers of two adjacent rings. Thi sis the Bolt Dead Center measurment. ...

    BCD or Bolt Center Diameter

    Quoted message said:

    ... some Sugino ring shave been discontinued and will be impossible to find. I beleive they
    were 94mm by 4 bolts.

    For which size about 50 different companies market chainrings ......

    Find me one, please.

    Sorry, I remembered 94 mm as being the outer BCD of a bog standard Compact crankset. It is,
    actually, but those have 5-arm rings. Are you sure Sugino had a 94mm/4-arm?

    Anyway, Sugino's Impel 100, 120 and 150 were riveted, the 280 and 300 models were 104/58 mm 4-arm
    models. Say the Sugino website at: www2.odn.ne.jpindex.html (you can choose the
    crankset models from the drop-down box in the left upper-hand corner)

    --
    Regards, Marten

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  8. Chris Phillipo
    Archived post
    #8
    Quoted message said:
    Quoted message said:
    Quoted message said:

    BCD or Bolt Center Diameter

    > ... some Sugino ring shave been discontinued and will be impossible to find. I beleive they
    > were 94mm by 4 bolts.

    For which size about 50 different companies market chainrings ......

    Find me one, please.

    Sorry, I remembered 94 mm as being the outer BCD of a bog standard Compact crankset. It is,
    actually, but those have 5-arm rings. Are you sure Sugino had a 94mm/4-arm?

    Yes, freaky isn't it. I don't know why anyone would buck the standard but they did and then
    abandoned it. One or two years of Specialized cranksets came this way and now I have to break the
    bad news to each customer as they come in looking for replacment rings.
    --
    _________________________
    Chris Phillipo - Cape Breton, Nova Scotia ramsays-online.comramsays-online.com

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  9. Rick Onanian
    Archived post
    #9
    Andrew Webster said:

    If you have a riveted crankset then you cannot easily replace individual rings. Looking at

    I've often wondered why it's viewed as impossible to remove the rivets and replace them with bolts.

    Although I concede that it's often impractical, given the usual quality of riveted cranksets.

    Quoted message said:

    Andrew Webster


    --
    Rick Onanian

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  10. Marten Hoffmann
    Archived post
    #10

    [email hidden] schreef ...

    Quoted message said:


    Quoted message said:
    Quoted message said:

    > BCD or Bolt Center Diameter
    >
    > > ... some Sugino ring shave been discontinued and will be impossible to find. I beleive
    > > they were 94mm by 4 bolts.
    >
    > For which size about 50 different companies market chainrings ......
    >
    >

    Find me one, please.

    Sorry, I remembered 94 mm as being the outer BCD of a bog standard Compact crankset. It is,
    actually, but those have 5-arm rings. Are you sure Sugino had a 94mm/4-arm?

    Yes, freaky isn't it. I don't know why anyone would buck the standard but they did and then
    abandoned it. One or two years of Specialized cranksets came this way and now I have to break the
    bad news to each customer as they come in looking for replacment rings.

    On the other hand: a complete crankset in similar quality costs roughly the same as a set of
    replacement rings for any other crankest, doesn't it?

    --
    Regards, Marten

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  11. David Kunz
    Archived post
    #11
    Chris Phillipo said:
    Quoted message said:
    Quoted message said:

    >BCD or Bolt Center Diameter
    >
    >
    >>... some Sugino ring shave been discontinued and will be impossible to find. I beleive they
    >>were 94mm by 4 bolts.
    >
    >For which size about 50 different companies market chainrings ......
    >
    >

    Find me one, please.

    Sorry, I remembered 94 mm as being the outer BCD of a bog standard Compact crankset. It is,
    actually, but those have 5-arm rings. Are you sure Sugino had a 94mm/4-arm?

    Yes, freaky isn't it. I don't know why anyone would buck the standard but they did and then
    abandoned it. One or two years of Specialized cranksets came this way and now I have to break the
    bad news to each customer as they come in looking for replacment rings.

    Isn't that what Shimano does every couple of years? Isn't that why we have so many "standard" sizes?

    David

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  12. Chris Phillipo
    Archived post
    #12

    In article <[email hidden]>,
    [email hidden] says...

    Quoted message said:
    Chris Phillipo said:
    Quoted message said:

    >>BCD or Bolt Center Diameter
    >>
    >>
    >>>... some Sugino ring shave been discontinued and will be impossible to find. I beleive they
    >>>were 94mm by 4 bolts.
    >>
    >>For which size about 50 different companies market chainrings ......
    >>
    >>
    >
    >Find me one, please.

    Sorry, I remembered 94 mm as being the outer BCD of a bog standard Compact crankset. It is,
    actually, but those have 5-arm rings. Are you sure Sugino had a 94mm/4-arm?

    Yes, freaky isn't it. I don't know why anyone would buck the standard but they did and then
    abandoned it. One or two years of Specialized cranksets came this way and now I have to break
    the bad news to each customer as they come in looking for replacment rings.

    Isn't that what Shimano does every couple of years? Isn't that why we have so many
    "standard" sizes?

    David

    Ya, but at least Shimano shoves so much product out there there's a good supply of parts for about
    a decade 🙂
    --
    _________________________
    Chris Phillipo - Cape Breton, Nova Scotia ramsays-online.comramsays-online.com

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