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Old 10-22-09, 08:46 AM   #1
scotch
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Correct Bb for Shimano 105 170mm triple crankset?

I just ordered this one.

For the Bb, my LBS says the Ultegra 6600 is compatible. I just don't know if I need the 68mm (English) or the 70mm (Italian). I'm new at drive train specs.

Thanks a ton.
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Old 10-22-09, 09:13 AM   #2
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What bike are you running? Most BBs are English thread, but Italian manufacturers tend to be loyal to their country's standards.
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Old 10-22-09, 09:17 AM   #3
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What bike are you running? Most BBs are English thread, but Italian manufacturers tend to be loyal to their country's standards.
Ah, sorry about that. It's a 2004 Bianchi Axis, which came with:

- Sugino XD-500D crankset
- Cartridge Bb, 107mm spindle, 68mm English shell width

This bike was made in Taiwan as far as I know.

Thanks.
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Old 10-22-09, 09:27 AM   #4
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Originally Posted by scotch View Post
Ah, sorry about that. It's a 2004 Bianchi Axis, which came with:

- Sugino XD-500D crankset
- Cartridge Bb, 107mm spindle, 68mm English shell width



Thanks.

There's your answer ..... a 68mm English BB shell width
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Old 10-22-09, 10:12 AM   #5
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great. thanks for the help!
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Old 10-22-09, 03:28 PM   #6
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Give some thought to getting rid of the 30 and replacing it with a 24T. The reason for a triple is low gears. You may not need a 24-27 , but it is nice to have when you do need it.
The index shifting won't be as slick, but with practice you will find how how easy it is.
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Old 10-22-09, 07:06 PM   #7
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Give some thought to getting rid of the 30 and replacing it with a 24T. The reason for a triple is low gears. You may not need a 24-27 , but it is nice to have when you do need it.
The index shifting won't be as slick, but with practice you will find how how easy it is.
The OP hasn't said anything about needing a lower granny gear. A 30-27 combination usually low enough. Going from a 30 to a 24 is a huge change and can cause shifting and dropped chain problems.
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Old 10-22-09, 07:33 PM   #8
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The OP hasn't said anything about needing a lower granny gear. A 30-27 combination usually low enough. Going from a 30 to a 24 is a huge change and can cause shifting and dropped chain problems.
+1 Wtf?
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Old 11-08-09, 07:47 PM   #9
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The new Ultegra 6600 Bb and 105 crank set are working like a charm. I also ended up getting a new Deore XT cluster; I figured for another $68, what the hell. Shifting is super smooth and crisp. This is definitely an upgrade.





Thanks again for the help.
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