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Are all Hollowtech II bottom brackets compatible?

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Are all Hollowtech II bottom brackets compatible?

Old 08-06-11, 07:54 AM
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xfimpg
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Are all Hollowtech II bottom brackets compatible?

Are all Hollowtech II bottom brackets compatible?
If I replace the bb on my Deore LX drivetrain (M580) with a 105 or Ultegra bb, are they compatible?
On my current bb I have one space on the passenger side and 2 spacers on the drivers side; I didn't see any spacers on the 105 or Ultegra kit, so I'm wondering about length compatibility?

EDIT: I verified Shimano's side and the bb width for Deore is 68/73 and Ultegra is 68/70; I believe I would be 3 milimeters short?

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Old 08-06-11, 10:20 AM
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To clarify, a MTB BB is made for either a 68mm or 73mm English-threaded shell; spacers are used with a 68mm shell. For the road BBs, the 68mm and 70mm are different as 70mm corresponds to Italian threading. You couldn't put a 68mm English BB into a 70mm Italian shell.

For English threading, the only incompatibility I can think of is that the plastic insert that goes between both cups to keep dirt out of the bearings might be too short on the road version to fit in a MTB shell, and vice-versa putting a MTB BB into a road shell. I believe the cups themselves are the same. You might be able to reuse the current spacers and plastic insert.
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Old 08-06-11, 01:22 PM
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I've been using an Shimano Saint bottom bracket with my 10sp Ultegra crank for years with no ill effects. The groove the center sleeve fit in to took up the extra sleeve width just fine.
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Old 08-06-11, 08:39 PM
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Originally Posted by JiveTurkey View Post
To clarify, a MTB BB is made for either a 68mm or 73mm English-threaded shell; spacers are used with a 68mm shell. For the road BBs, the 68mm and 70mm are different as 70mm corresponds to Italian threading. You couldn't put a 68mm English BB into a 70mm Italian shell.

For English threading, the only incompatibility I can think of is that the plastic insert that goes between both cups to keep dirt out of the bearings might be too short on the road version to fit in a MTB shell, and vice-versa putting a MTB BB into a road shell. I believe the cups themselves are the same. You might be able to reuse the current spacers and plastic insert.
Agreed.
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Old 08-07-11, 03:11 AM
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According to Shimano, the Road and MTB HTII BBs are not interchangeable. When Lennard Zin answered a query about this on the VeloNews website, saying that they were interchangeable, he soon posted in his next article a response from Shimano correcting his information and saying that were not compatible. I can't remember what reason the Shimano rep' gave him, but it means that since then I've never tried to mix the two.
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Old 08-07-11, 05:42 AM
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Originally Posted by Chris_W View Post
According to Shimano, the Road and MTB HTII BBs are not interchangeable. When Lennard Zin answered a query about this on the VeloNews website, saying that they were interchangeable, he soon posted in his next article a response from Shimano correcting his information and saying that were not compatible. I can't remember what reason the Shimano rep' gave him, but it means that since then I've never tried to mix the two.
Thanks
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Old 08-07-11, 09:03 AM
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The length of the splines is different.
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