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chainring bcd

Started by Matthew Paterso · · Last activity · 7 posts · 940 views

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01 / Original postchainring bcdMatthew Paterso · 16 Apr 2004 02 / This pagePosts 1–7Page 1 of 1 · chronological order 03 / Latest replyPost #7Bomba · 17 Apr 2004

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Original section
Mountain Bikes
Published
16 April 2004
Last activity
17 April 2004
Original author
Matthew Paterso
Posts
7
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Public discussion
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940
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Topics
Chainrings

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  1. Original post
    Matthew Paterso
    Archived post
    #1

    Quick question

    How do I measure the bcd of a chainring. I have one which is
    94 mm, and this wont fit my MRP, I need one which is 110 mm.
    But what do these numbers relate to?

    Thanks

    --
    Matt

    Fear of a flat planet

    Report
  2. Spademan O----L
    Archived post
    #2

    "Matthew Paterson" <[email hidden]> wrote in message
    "]news:[email hidden]...

    Quoted message said:

    Quick question

    How do I measure the bcd of a chainring. I have one which
    is 94 mm, and this wont fit my MRP, I need one which is
    110 mm. But what do these numbers relate to?

    Quoted message said:

    Matt

    BCD = Bolt Circle Diameter, 94mm = Compact drive, 110mm =
    standard drive. Take a chainring you know fits and use it to
    compare to one you want to buy, make sure the bolt holes
    align all the way round. Another clue is the tooth count,
    compact drive chainrings are usually 22/32/42T wheras
    standard drive are 26/36/46.

    Steve.

    Report
  3. Bomba
    Archived post
    #3
    Matthew Paterson said:

    How do I measure the bcd of a chainring. I have one which
    is 94 mm, and this wont fit my MRP, I need one which is
    110 mm. But what do these numbers relate to?

    BCD is the distance between chainring bolt holes (literally
    the diameter of the circle made by the bolts).

    94mm is compact drive, 110mm is old standard size, IIRC.
    Sounds like you've got the wrong MRP device.

    --
    a.m-b FAQ: j-harris.netambfaq.htm

    b.bmx FAQ: t-online.debmx faq.htm

    Report
  4. Matthew Paterso
    Archived post
    #4
    bomba said:

    94mm is compact drive, 110mm is old standard size, IIRC.
    Sounds like you've got the wrong MRP device.

    Or wrong chainring 😉

    I have a 110 MRP and a 110 DMR spider, and a 94 chainring.

    --
    Matt

    Fear of a flat planet

    Report
  5. Zilla
    Archived post
    #5
    Matthew Paterson said:

    Quick question

    How do I measure the bcd of a chainring. I have one which
    is 94 mm, and this wont fit my MRP, I need one which is
    110 mm. But what do these numbers relate to?

    Thanks

    --
    Matt

    Fear of a flat planet

    hostelshoppe.comtech bolt circle diameter.php

    --
    - Zilla Cary, NC (Remove XSPAM)

    Report
  6. Jansen A. Danga
    Archived post
    #6

    To all,

    Do you know of any standard BCD bolt diameter chainring with
    a granny of 22T?

    regards "spademan o---[) *"
    <[email hidden]> wrote in message
    "]news:[email hidden]...

    Quoted message said:


    "Matthew Paterson" <[email hidden]> wrote in
    message
    "]news:[email hidden]...

    Quoted message said:

    Quick question

    How do I measure the bcd of a chainring. I have one
    which is 94 mm, and this wont fit my MRP, I need one
    which is 110 mm. But what do these numbers relate to?

    Quoted message said:

    Matt

    BCD = Bolt Circle Diameter, 94mm = Compact drive, 110mm =
    standard drive. Take a chainring you know fits and use it
    to compare to one you want to


    buy,

    Quoted message said:

    make sure the bolt holes align all the way round. Another
    clue is the


    tooth

    Quoted message said:

    count, compact drive chainrings are usually 22/32/42T
    wheras standard


    drive

    Quoted message said:

    are 26/36/46.

    Steve.

    Report
  7. Bomba
    Archived post
    #7
    Jansen A. Danganan said:

    Do you know of any standard BCD bolt diameter chainring
    with a granny of 22T?

    The smallest size available for standard drive is 24t.

    Report

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