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chainring bcd

Started by spademan o---[\) * · · Last activity · 7 posts · 553 views

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01 / Original postchainring bcdspademan o---[\) * · 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
spademan o---[\) *
Posts
7
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Public discussion
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553
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Topics
Chainrings

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  1. Original post
    spademan o---[\) *
    Archived post
    #1

    "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
  2. bomba
    Archived post
    #2
    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: http://www.j-harris.net/bike/ambfaq.htm

    a.bmx FAQ: http://www.t-online.de/~jharris/bmx_faq.htm

    Report
  3. Matthew Paterson
    Archived post
    #3

    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
  4. Matthew Paterson
    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

    http://www.hostelshoppe.com/tech_bolt_circle_diameter.php

    --
    - Zilla
    Cary, NC
    (Remove XSPAM)

    Report
  6. Jansen A. Danganan
    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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