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Trouble Installing Octalink Cranks/BB

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Trouble Installing Octalink Cranks/BB

Old 06-28-08, 04:16 PM
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br995
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Trouble Installing Octalink Cranks/BB

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 -- https://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, 04:26 PM
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pics?

is the BB octalink or ISIS?
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Old 06-28-08, 04:51 PM
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Sometimes this just happens.

I had to run a 3mm spacer on the drive side of one of my frames because the inner ring rubbed on the stay. In my case, it was a known problem with a certain vintage of that particular frame. Sometimes cross frames are built with a chainline to allow for a single ring up front, are you sure you don't have one of those?

Last edited by terry b; 06-28-08 at 04:55 PM.
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Old 06-28-08, 04:58 PM
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Originally Posted by kudude View Post
pics?

is the BB octalink or ISIS?
I'll see if I can get some pictures.

The cranks are Dura Ace 7700 and the bottom bracket is a Shimano 5500, so definitely octalink.


Originally Posted by terry b View Post
Sometimes this just happens.

I had to run a 3mm spacer on the drive side of one of my frames because the inner ring rubbed on the stay. In my case, it was a known problem with a certain vintage of that particular frame. Eventually, I modified the stay by grinding away some material and having it repainted (it's a CF frame) but you may have to just put a spacer on there.
Thanks for the insight. Obviously I'd prefer a "You idiot here's what you're doing wrong" solution, but I wouldn't mind using a spacer if that's what it came down to.
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Old 06-28-08, 05:11 PM
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135mm spacing and oversize aluminum chainstays?
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Old 06-28-08, 05:49 PM
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Originally Posted by Soil_Sampler View Post
135mm spacing and oversize aluminum chainstays?
Nah. It's a steel frame and 130mm spacing.

I don't have any previous experience with Octalink and this is really confusing me.
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Old 06-28-08, 06:02 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 06-28-08, 06:08 PM
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post pix of your chainstay shape and where the chainstay and BB shell are attached.
if the chainstays are straight and welded too far outside on the BB shell,
that might be where the interference problem is.
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Old 06-28-08, 06:18 PM
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It's your frame. I have the same problem with my Country Road Bob.
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Old 06-28-08, 06:26 PM
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I emailed Gene at Spicer earlier this morning when the problems began to ask if he has any idea as to cause. It may very well be as you say, idcruiserman, that it is the frame itself that is creating the problem.

It does look to me, though, as if the cranks are threading onto the spindle too far. But again, I've never used Octalink before so I may be wrong.

idcruiserman: How did you solve the problem with your Country Road Bob? Spacer? Certain crankset/BB combination? A longer spindle would get rid of the rubbing, but it seems like it would cause chainline issues.



Here are some pictures. Hope they are what you were looking for.
111
222
333
444
555

Last edited by br995; 06-28-08 at 06:38 PM.
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Old 06-28-08, 06:28 PM
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you can use a XTR octalink BB
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Old 06-28-08, 06:47 PM
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Awesome. I'll look into that.
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Old 06-28-08, 06:54 PM
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Originally Posted by br995 View Post
Awesome. I'll look into that.
https://www.universalcycles.com/shopp...2&category=347
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Old 06-28-08, 06:56 PM
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Originally Posted by Soil_Sampler View Post
That would work with a 68mm bottom bracket shell?
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Old 06-28-08, 06:58 PM
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yes, comes with spacers for 68/73 BB compatibility.

is your small chainring 42 or 39 tooth?
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Old 06-28-08, 08:12 PM
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Awesome. Thank you very much for the advice. (someone else also confirmed that that BB should work)

The small is a 39.

Got a message back from Spicer, he said he has had varying degrees of success with different cranks on those frames and that it's probably just a poor match of bb/crank/frame. He seems to think a 112.5 xtr BB will work.
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Old 06-28-08, 08:18 PM
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hopefully you won't need more than 1.5mm to clear the chainstay.
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Old 06-30-08, 03:12 PM
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I haven't yet solved the problem. Van Dessel has offered me an updated frame that fixes the problem . I am looking to space it out for now.
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Old 06-30-08, 03:14 PM
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Originally Posted by br995 View Post
Awesome. Thank you very much for the advice. (someone else also confirmed that that BB should work)

The small is a 39.

Got a message back from Spicer, he said he has had varying degrees of success with different cranks on those frames and that it's probably just a poor match of bb/crank/frame. He seems to think a 112.5 xtr BB will work.
Please update once you get it sorted out. I am considering going that route as well. I have a 112.5mm ES70 in the parts bin to try.

Edit:
Just tried out my 113mm XT bb, and it provides just enough clearance. I'm concerned it will rub under flex, but I'll have to try it out. I may get the 116mm XTR bb.

Last edited by idcruiserman; 06-30-08 at 03:58 PM.
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Old 06-30-08, 03:23 PM
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One more post.

Found them for $52.37.
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Old 06-30-08, 06:43 PM
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Originally Posted by idcruiserman View Post
I have a 112.5mm ES70 in the parts bin to try.

I may get the 116mm XTR bb.
ES70 is the Shimano V2 spline
XTR is the Shimano V1 spline, make sure you have the correct cranks for this BB.
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Old 06-30-08, 07:05 PM
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Yes, I just figured that out after not being able to install the crank on the bb. Why did Shimano produce 2 very similar versions?
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