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  1. #1
    Senior Member Surferbruce's Avatar
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    trying to figure out chainline

    ok i'm lost
    getting ready to build up my 1985 pinarello frame. it's spaced 126mm in the rear and has a 70mm BB shell.
    I'm looking at the Sugino RD crankset. i'd love a full full campy set up or miche primato but for now the RD's will have to do.
    I'm also leaning toward the IRO basic wheelset which has 120mm hubs which i understand can be used with spacers on a 126mm.
    what i'm having trouble figuring is what length spindle i need in BB to get a good chainline.
    IRO says it's hubs line up at 42mm.
    the Sugino RD's supposedly end up with a 44mm chainline using a 107 BB.
    that leads me to assume i need a BB with a 105mm spindle.
    anyone lend some advice?

  2. #2
    Senior Member terrapin04's Avatar
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  3. #3
    Senior Member Surferbruce's Avatar
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    yeah i've seen that but for one it says the IRO hub isn't adjustable which form aht i understand it is due to it's longer axle.
    i'm still confused.

  4. #4
    Senior Member terrapin04's Avatar
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    I just ordered some 165 rd's for my guerciotti frame from business cycles. I also ordered the miche primato 107 bb, which is 'somewhat' adjustable. I think I'll get close to 44mm. I don't have iro hubs, but you may want to check out this setup...the miche bb is only $25: http://www.businesscycles.com/tbb-miche.htm

  5. #5
    Cornucopia of Awesomeness baxtefer's Avatar
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    Quote Originally Posted by terrapin04
    I just ordered some 165 rd's for my guerciotti frame from business cycles. I also ordered the miche primato 107 bb, which is 'somewhat' adjustable. I think I'll get close to 44mm. I don't have iro hubs, but you may want to check out this setup...the miche bb is only $25: http://www.businesscycles.com/tbb-miche.htm
    the taper on your BB (ISO) doesn't match the taper for the cranks (JIS)
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  6. #6
    Direct Hit Not Required BlastRadius's Avatar
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    Quote Originally Posted by Surferbruce
    ...IRO says it's hubs line up at 42mm. The Sugino RD's supposedly end up with a 44mm chainline using a 107 BB. That leads me to assume i need a BB with a 105mm spindle.
    More like a 103mm. To take 2mm off a chainline, you'll need to shorten a symmetrical BB spindle on both sides by 2mm, i.e. 107mm - (2 x 2mm). You'll find it easier to find 103 BBs than 105 BBs anyway.

  7. #7
    Senior Member Surferbruce's Avatar
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    B-rad
    so a 105mm will give a 43mm chainline for example...makes more sense now.
    i'm probably gonna buy the cranks and BB from Harris and they do sell IRO hubs so they can probably steer me away from trouble. at first read it had my peabrain spinning though.
    gracias.

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    If you can find an inexpensive 103mm BB w/JIS tapers you're set. I, however, could not. My compromise: 107mm UN53 BB and move the chainring to the inside position. It's not perfect, but it's good enough.

  9. #9
    Perineal Pressurized dobber's Avatar
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    Forty Bucks will get you an FSA spindle.

    According to Bens Bike auction, this Sugino XD uses a 107, might be an option (this might be the same as the RD though and give you a 44)

    Another option is to scrounge up an older Shimano BB (UN-71) where both cups are removable. A little creative grinding of the flange on the drive side cup gives you a poor mans Phil.

    Depending on your hub you might be able to slip a 1mm spacer behind the cog.
    This is Africa, 1943. War spits out its violence overhead and the sandy graveyard swallows it up. Her name is King Nine, B-25, medium bomber, Twelfth Air Force. On a hot, still morning she took off from Tunisia to bomb the southern tip of Italy. An errant piece of flak tore a hole in a wing tank and, like a wounded bird, this is where she landed, not to return on this day, or any other day.

  10. #10
    F*** Corporate Beer daveIT's Avatar
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    Good reference from business cycles

  11. #11
    SuperstitiousHyperrealist jinx_removing's Avatar
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    Whoah, everybody hold up now. This thread is making my head spin.

    The recommended BB is probably the best for your situation. The IRO hub with an EAI 3/32" cog will give you a chainline of 43.13 in the back. That's close enough if to 44 you ask me. If you really needed to get closer you can space the wheel 1mm off to the right, but that probably won't be necessary.

    [Wrong]Also, I'm pretty sure the JIS standard was abandoned by Sugino some time ago as my Sugino cranks fit perfectly on an ISO taper BB.[Wrong]

    edit: I had it all wrong before, they are JIS taper. You shouldn't have any BB problems if you get a Shimano 107mm BB(UN-53 or 73 style) which is also JIS taper. What had me confused here was that Sugino at one time used ISO taper and I had it all mixed up in my head.
    Last edited by jinx_removing; 04-23-05 at 01:59 PM.

  12. #12
    Cornucopia of Awesomeness baxtefer's Avatar
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    Quote Originally Posted by jinx_removing
    Also, I'm pretty sure the JIS standard was abandoned by Sugino some time ago as my Sugino cranks fit perfectly on an ISO taper BB.
    Sugino 75's still call for a 109mm JIS tapered spindle.
    you can get a JIS crank on an ISO taper, and vice versa, but you risk:
    1. a chainline you didn't expect
    2. damaged cranks.
    {o,o**
    |)__)
    -"-"-

    O RLY?

  13. #13
    Senior Member Surferbruce's Avatar
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    jinx
    thanks for lifting the fog a bit. 43.13 is indeed close enough. sounding better all the time.

  14. #14
    SuperstitiousHyperrealist jinx_removing's Avatar
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    Quote Originally Posted by baxtefer
    Sugino 75's still call for a 109mm JIS tapered spindle.
    you can get a JIS crank on an ISO taper, and vice versa, but you risk:
    1. a chainline you didn't expect
    2. damaged cranks.
    You are indeed correct. I had my tapers all mixed up in my head(which is barely functioning right now due to a brutal hangover). I edited the above post to reflect. I was confused because of a recent discussion about how Sugino at one time used the ISO standard and no longer do. My apologies for the misinformation.

  15. #15
    Senior Member terrapin04's Avatar
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    Quote Originally Posted by baxtefer
    the taper on your BB (ISO) doesn't match the taper for the cranks (JIS)

    Mmmmm, I didn't know this. After talking to John at businesscyles, i was under the impression that they were compatible, however if they are two different tapers, one wouldn't think so. Without rehashing old threads regarding iso/jis compatibility, would you recommend just getting a different bb, perhaps shimano un53?

  16. #16
    Frankly, Mr. Shankly absntr's Avatar
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    The Sugino RD's will give you the correct chainline as BlastRadius said with a 103 BB. That's what come stock on the Bianchi Pista 05, with the chainring on the inside.

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