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Dura Ace 7710 Bottom Bracket Compatibility

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Dura Ace 7710 Bottom Bracket Compatibility

Old 06-27-17, 05:12 AM
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Dura Ace 7710 Bottom Bracket Compatibility

Can the DA 7710 "Track" Bottom Bracket be used with the DA 7700 Road Crank set? The 7700 and 7710 BB's are both listed as Octalink with a 109.5 diameter. Is there any differences?

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Old 06-27-17, 12:25 PM
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Originally Posted by carleton
The BB-7700 is the needle bearing model. BB-7710 is the NJS sealed bearing model.

NJS racers are required to race in the rain which makes the sealed bearing model (7710) more practical.


The needle bearing model (7700) can be tuned to spin more smoothly than the sealed model using tension (or lack thereof) on the bearings and your choice of lubricant. But, this one needs the routine maintenance than all ball bearing hubs require.

So, I guess use the 7700 on the indoor / special occasion bike and use the 7710 on the outdoor / training bike.
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Old 06-27-17, 12:50 PM
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I did a quick weight weenie and the 7710 weighs 260gm, the 6500 230gm. I suspect the 105 (5500) is around 250gm.

Just food for thought.

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