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73mm BB + Shamano 6500 = Impossible??

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73mm BB + Shamano 6500 = Impossible??

Old 01-15-12, 09:33 PM
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RJMurphy
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73mm BB + Shamano 6500 = Impossible??

I ended up picking up some 6500's for when I get ready to update my Bridgestone (don't worry, it's nothing special). It's a cottered crank, so I want to move to something new. The 53-t gear is also pancaked against a guard and I can't seem to get it off. It causes chain derailing pretty easy also. Big problem is, I can't seem to find a 73mm Octalink BB in V1?? I referenced https://sheldonbrown.com/bbsize.html#ultegra and did not see a single thing indicating that it even exists. Anyone out there happen to have matter-of-fact knowledge about this??
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Old 01-15-12, 09:48 PM
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Is this a MTB? The road standard is 68mm, which is what an Ultegra crank would require. Where is the 73 coming from?
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Old 01-15-12, 10:19 PM
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Originally Posted by FastJake View Post
Is this a MTB? The road standard is 68mm, which is what an Ultegra crank would require. Where is the 73 coming from?

It is not. It's an old Bridgestone roadbike from 1971. I measure it with a caliper and so did the LBS. Both concurred it is 73mm.
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Old 01-15-12, 10:53 PM
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Originally Posted by RJMurphy View Post
It is not. It's an old Bridgestone roadbike from 1971. I measure it with a caliper and so did the LBS. Both concurred it is 73mm.

That's very weird. I was under the impression that 73mm width BB shells did not appear until mountain bikes became popular, some time in the late '80's. All the Bridgestones I worked on used conventional 68mm width English thread BB's.
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Old 01-15-12, 11:10 PM
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Originally Posted by Jeff Wills View Post
That's very weird. I was under the impression that 73mm width BB shells did not appear until mountain bikes became popular, some time in the late '80's. All the Bridgestones I worked on used conventional 68mm width English thread BB's.
This bike also has a quill seat stem and no model name to reference it. Quite a strange bike indeed!
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Old 01-15-12, 11:14 PM
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I don't remember ever having replaced the bb in any of those, but I thought they were pretty standard. If there is room, you might be able to face some of the bb shell off.
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Old 01-15-12, 11:16 PM
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Is this what you are looking for?
https://www.bikebling.com/SShimano-Oc...alink-73mm.htm

Note:
Somebody will correct me if I am wrong, but, isn't the only difference between V1 and OL9(V2) the depth of the splines?
MTB cranks will not seat far enough on V1 splines, but shouldn't road cranks fit on OL9(v2)?

Last edited by catmandew52; 01-15-12 at 11:57 PM. Reason: added note.
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Old 01-16-12, 01:01 AM
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Originally Posted by catmandew52 View Post
Somebody will correct me if I am wrong, but, isn't the only difference between V1 and OL9(V2) the depth of the splines?
MTB cranks will not seat far enough on V1 splines, but shouldn't road cranks fit on OL9(v2)?


Ridges are different width.

Originally Posted by https://sheldonbrown.com/bbsize.html#shimano
Note: Octalink V1 and V2 splined bottom brackets are very similar looking but if you use the wrong version you will ruin your crank! If in doubt, measure.
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Old 01-16-12, 07:54 AM
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Originally Posted by JiveTurkey View Post


Ridges are different width.

Told ya I'd be corrected.
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Old 01-16-12, 10:02 AM
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I've owned with two mid-80's Bridgestone road bikes and they both came with standard English threaded 68 mm borrom bracket shells. Are you sure you are measuring the shell itself, not across the outside of the current bb cups?
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Old 01-16-12, 11:37 PM
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Originally Posted by HillRider View Post
I've owned with two mid-80's Bridgestone road bikes and they both came with standard English threaded 68 mm borrom bracket shells. Are you sure you are measuring the shell itself, not across the outside of the current bb cups?
The OP said it was from 1971. By the '80's Bridgestone had gotten "normal", but that era bike could conceivably have an odd bottom bracket shell. Since it's also got the binder-wedge seatpost, anything is possible.

The folks on the Classic & Vintage forum might have better info.
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Old 01-17-12, 03:02 AM
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Originally Posted by Jeff Wills View Post
The OP said it was from 1971. By the '80's Bridgestone had gotten "normal", but that era bike could conceivably have an odd bottom bracket shell. Since it's also got the binder-wedge seatpost, anything is possible.

The folks on the Classic & Vintage forum might have better info.

Awesome, thanks! I thought to, but figured this may be a better forum. Back to C&V!
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