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MRP

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01 / Original postMRPMatthew Paterso · 31 Oct 2003 02 / This pagePosts 1–7Page 1 of 1 · chronological order 03 / Latest replyPost #7Andy Chequer · 1 Nov 2003

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Mountain Bikes
Published
31 October 2003
Last activity
1 November 2003
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Matthew Paterso
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  1. Original post
    Matthew Paterso
    Archived post
    #1

    Hi

    I have recently acquired a World Cup System 1, bb mount, 36-44t 5 bolt 110mm chainguide. I also got
    a DMR 5 bolt spider (that can accept 3 chainrings) and a set of 24/7 3 piece cranks.

    Now the spider fits on the cranks fine, but where the holes for the outer ring are on the spider,
    they dont line up with the holes on the MRP chain plates, they are all about 5mm short.

    Will I require a new spider for this chainguide, or do I need new plates for the MRP?

    I havent tried fitting it to the bike yet.

    Thanks.

    --
    Matt

    Fear of a flat planet

    Report
  2. Bomba
    Archived post
    #2
    Matthew Paterson said:

    I have recently acquired a World Cup System 1, bb mount, 36-44t 5 bolt 110mm chainguide. I also
    got a DMR 5 bolt spider (that can accept 3 chainrings) and a set of 24/7 3 piece cranks.

    Now the spider fits on the cranks fine, but where the holes for the outer ring are on the spider,
    they dont line up with the holes on the MRP chain plates, they are all about 5mm short.

    Will I require a new spider for this chainguide, or do I need new plates for the MRP?

    I'm guessing you got the DMR spider which uses compact drive (94mm pcd) which is incompatible with
    your standard drive (110mm pcd) MRP device.

    Which part you change depends on your chainring. If it's standard drive, change the spider. If it's
    compact drive, change the MRP plates.

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

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

    Report
  3. Small Black Dog
    Archived post
    #3
    Quoted message said:

    I'm guessing you got the DMR spider which uses compact drive (94mm pcd) which is incompatible with
    your standard drive (110mm pcd) MRP device.

    Which part you change depends on your chainring. If it's standard drive, change the spider. If
    it's compact drive, change the MRP plates.

    isnt it BCD, not pcd ?

    Small Black Dog

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

    I'm guessing you got the DMR spider which uses compact drive (94mm pcd) which is incompatible with
    your standard drive (110mm pcd) MRP device.

    Which part you change depends on your chainring. If it's standard drive, change the spider. If
    it's compact drive, change the MRP plates.

    Thanks bomba. That will be the problem. Cheers.

    --
    Matt

    Fear of a flat planet

    Report
  5. Bomba
    Archived post
    #5
    Small Black Dog said:
    Quoted message said:

    I'm guessing you got the DMR spider which uses compact drive (94mm pcd) which is incompatible
    with your standard drive (110mm pcd) MRP device.

    Which part you change depends on your chainring. If it's standard drive, change the spider. If
    it's compact drive, change the MRP plates.

    isnt it BCD, not pcd ?

    BCD (bolt circle diameter) is the distance between adjacent holes. PCD (pitch circe diameter) is the
    diameter of the bolt circle:
    chickencycles.comTA chainring tech.jpg

    However, according to Sheldon, this is a British thing and we should all be using BCD...

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

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

    Report
  6. Small Black Dog
    Archived post
    #6
    bomba said:
    Small Black Dog said:
    Quoted message said:

    I'm guessing you got the DMR spider which uses compact drive (94mm pcd) which is incompatible
    with your standard drive (110mm pcd) MRP device.

    Which part you change depends on your chainring. If it's standard drive, change the spider. If
    it's compact drive, change the MRP plates.

    isnt it BCD, not pcd ?

    BCD (bolt circle diameter) is the distance between adjacent holes. PCD (pitch circe diameter) is
    the diameter of the bolt circle:
    chickencycles.comTA chainring tech.jpg

    However, according to Sheldon, this is a British thing and we should all be using BCD...

    cool, cheers for the info

    Small Black Dog

    Report
  7. Andy Chequer
    Archived post
    #7
    Quoted message said:

    BCD (bolt circle diameter) is the distance between adjacent holes. PCD (pitch circe diameter) is
    the diameter of the bolt circle:

    Factoid!

    Andy Chequer, hey chaps

    Report

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