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Octalink Cranks Installing Too Far?

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Octalink Cranks Installing Too Far?

Old 06-28-08, 12:25 PM
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br995
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Octalink Cranks Installing Too Far?

I recently purchased a (used) dura ace double crankset and (supposedly matching) bottom bracket to use on my Gene Spicer cyclocross frame. The cranks are the 7700s and according to Sheldon's site -- http://www.sheldonbrown.com/bbsize.html -- I need a BB with a 109.5 spindle length. That's what the bottom bracket is. It is also for a 68mm shell width, which is what the frame has.

When I attempt to install the cranks on the bottom bracket, they tighten down so far that the inner chainring rubs the frame. It seems as if the spindle isn't long enough, even though as far as I can tell it is the length I need for the crankset and gearing (9spd) that I am using. I have looked up various suggestions on how to properly install the cranks and have tried everything I have found (except using a torque wrench). I have removed the bolts so I can see the splines align, follow the Park Tool suggestion of putting a spline at 12:00 and the driveside crank at 6:00 and then installing the non-drive side at 12:00.

Both sides tighten down much further than they appear they should and I am never met with much resistance. Like I said, it gets to the point where the inner chainring rubs the seat stay. The threads and splines and inside of the crank arms all appear fine, though I am not familiar with what definitely good ones look like.

Any idea as to why this is happening?


(I have tried searching for answers, but haven't found anything)
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Old 06-28-08, 05:00 PM
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Your cranks need an Octalink version 1 spindle. Perhaps your spindle is version 2 with splines about twice as deep.
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Old 06-28-08, 05:48 PM
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What's the part # on the BB?
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Old 06-28-08, 05:50 PM
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That was suggested before (that I may be mixing V1 and V2). The bottom bracket is a Shimano BB5500, which as far as I can tell is V1 and should match the crankset. I'm going to get get it though and compare it to the pictures on Sheldon's site.
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Old 06-28-08, 06:01 PM
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I just triple checked everything. The bottom bracket is BB5500 68mm and 109.5 spindle.

The crankset is a Dura Ace FC7700. The FC doesn't denote something odd, does it? (i.e. "Dura Ace 7700 cranks" would be the same as "Dura Ace FC7700 cranks," right?) Found a post here that calls the FC7700 V1 compatible so I don't think it does.

Still really confused.
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Old 06-29-08, 12:03 AM
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Maybe it's a matter of what bike you are putting them on?
If it's a bike designed for smaller rings, maybe you simply don't have enough clearance for the size you're using???
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Old 06-29-08, 05:55 AM
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Many times on a cross bike you ditch the inner ring and just run a single 44 tooth. The 109.5 seems the right spec, though your chainstays would appear to be further out. You could try a spacer or 2 on the drive side cup or opt for a longer spindle length BB.
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Old 06-29-08, 08:39 AM
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Originally Posted by capwater View Post
Many times on a cross bike you ditch the inner ring and just run a single 44 tooth. The 109.5 seems the right spec, though your chainstays would appear to be further out. You could try a spacer or 2 on the drive side cup or opt for a longer spindle length BB.
I would opt for the longer bb. Spacers are a last resort.
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Old 06-29-08, 09:27 AM
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Historically, Dura Ace has its own compatibility standards. Maybe you need to get the matching BB-7700 bottom bracket.
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