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-   -   Correct Bb for Shimano 105 170mm triple crankset? (https://www.bikeforums.net/bicycle-mechanics/596542-correct-bb-shimano-105-170mm-triple-crankset.html)

scotch 10-22-09 08:46 AM
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.

SpinDr 10-22-09 09:13 AM
What bike are you running? Most BBs are English thread, but Italian manufacturers tend to be loyal to their country's standards.

scotch 10-22-09 09:17 AM
Originally Posted by SpinDr (Post 9904881)
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.

Garthr 10-22-09 09:27 AM
Originally Posted by scotch (Post 9904906)
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

scotch 10-22-09 10:12 AM
great. thanks for the help!

davidad 10-22-09 03:28 PM
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.

Al1943 10-22-09 07:06 PM
Originally Posted by davidad (Post 9907234)
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.

operator 10-22-09 07:33 PM
Originally Posted by Al1943 (Post 9908383)
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?

scotch 11-08-09 07:47 PM
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.

http://i296.photobucket.com/albums/m...r_IMG_1162.jpg

http://i296.photobucket.com/albums/m...r_IMG_1164.jpg

Thanks again for the help.


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