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How can I tell if a crankset is octalink v1 or v2? FC-6503 Ultegra

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How can I tell if a crankset is octalink v1 or v2? FC-6503 Ultegra

Old 04-19-13, 03:33 PM
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How can I tell if a crankset is octalink v1 or v2? FC-6503 Ultegra

I have a crankset that I wish to use. It has an octalink interface. I am just not sure if its v1 or v2. Whomever had it before me put an octalink v2 style BB on it but I'm not sure that is right. When I look at the splines on the crank, they look like that only a tiny bit will engage the splines on the BB. The BB is a BB-ES51 113mm 68mm shell.

Is that correct or was there a mismatch done here?
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Old 04-19-13, 03:52 PM
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According to this, it takes a BB-6500, which is/was V1: https://techdocs.shimano.com/media/te...9830611829.pdf
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Old 04-19-13, 04:00 PM
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Well crap. Then that means the crank is probably toast at this point. Buggers.
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Old 04-19-13, 05:52 PM
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Octalink

Originally Posted by bobotech
Well crap. Then that means the crank is probably toast at this point.
maybe, maybe not.

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Old 04-19-13, 06:23 PM
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BB-ES51 is a V2. I'm a little surprised the Ultegra crank would fit onto it because the splines on a V2 bottom bracket are a little thicker.
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Old 04-19-13, 06:54 PM
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Well I looked. It appears that whomever had the crankset before me only got about 1mm or a tad more worth of engagement on the splines on the BB. I then tried the crankarms on my 105 crankset that does have V1 octalink and sure enough, the arms engage a LOT more than when they were on the V2 bb. Only about the first 1mm appears to be damaged on the Ultegra crankarms so I'm confident that I could use them on a V1 BB.

So now to source a V1 BB in 118mm width.
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Old 04-19-13, 07:04 PM
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You'll fine a 118.5mm V1 probably, rather than 118. The 105 level v1 BB is still made AFAIK, and is a good, solid unit.

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