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  1. #1
    Senior Member abeyance's Avatar
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    06 XTR Crank/ Road BB Shell

    Will a 06 xtr crank with external bb bearings fit a standard road shell. My LBS said something about a 1mm difference between road and mountain shells with standard cartridge bb's, as well as one crank being more offset than the other. Does anyone know anything about this
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  2. #2
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    read the instructions that came with your cranks, it will explain where to put the plastic spacers that came with the crankset in order to space the cups properly.

  3. #3
    Elitist Troglodyte DMF's Avatar
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    What's the point? Just smaller rings (44-32-22) ?

    Yes, it will fit but it won't "work". Shell width is standard (assuming you don't have a weird bike) — either 68 or 73mm. But MTBs have a larger rear chainline than road bikes. Since the spindle is integral with the crankset with Hollowtech II cranks, you don't have the luxury of selecting the spindle length. XTR crankset is made for 50mm chainline. Road triples use 45mm. That's a big difference in chainline land.

    Edit: see below.
    Last edited by DMF; 08-02-07 at 11:15 AM.
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  4. #4
    Elitist Troglodyte DMF's Avatar
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    Quote Originally Posted by OneTinSloth View Post
    read the instructions that came with your cranks, it will explain where to put the plastic spacers that came with the crankset in order to space the cups properly.
    Hmmm.. The spacers are there to fit the axle to a 68mm hanger tube (it fits 73mm without them). But if the road bike has a 68mm tube, then leaving the spacers out would pull the chain wheels over 5mm, giving you a 45mm chainline.

    Then all you have to worry about is clearance...
    Stupidity got us into this mess - why can't it get us out?

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  5. #5
    Senior Member abeyance's Avatar
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    Well, I just got the IRO group buy, piecing the bike together. I noticed that the 06 XTR's are cheap at Nashbar now, so the price for xtr cranks are comparable to a set of road cranks/bb/appropriate chainring. track components pricing on ebay/ everywhere else is abusive now.
    plus with a 22 rear cog, I could use the bike as a gymnastic bike ( I always wanted one)
    using for commuting, so I wanted something sealed/bulletproof.
    and if it doesnt fit, my MTB needs a new crank anyway.
    thanks for all the help.
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