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Old 08-15-06, 04:35 PM   #1
JunkYardBike
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Shimano Sealed BB cartridge installation

Hi,

I've recently installed a Shimano ES-51 BB on an old early 90s Specialed Crossroads Cromoly frame. The shell is 68mm. My concern is that the right side (non-drive) plastic adapter, fully tightened, is not flush with the shell rim. Does anyone know how this should fit? I can fit a fingernail between the shell and the adapter flange. There doesn't seem to be any play in the crankset, but of course, I haven't ridden it yet.

I've inspected a couple other bikes with what appear to be Shimano BBs, and the plastic adapter on those all seemed to be seated much deeper, almost flush with the shell.

There was light rust on the threads after I removed the old BB, but I brushed it and cleaned it up. However, at the joint between the chainstay and shell, there appeared to be a small area of raised corrosion that I couldn't remove. It's possible the adapter is stopping at this point.

I really haven't been able to find much about proper fit (even on the Shimano website, which gives rather brief instructions for installation.) Am I concerned about nothing? Is it likely to be tight enough as it is?

Thanks,
Patrick
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Old 08-15-06, 04:38 PM   #2
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Ary you sure the ES-51 is intended for a 68 mm bb shell? IIRC, the ES bottom brackets are MTB components and may be made for a 73 mm bb width.
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Old 08-15-06, 05:10 PM   #3
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That's a thought. I definitely ordered a 68mm (they do come in that size). I think I checked the cartridge label before installing, but now I'm not sure.

It's standing about 3mm outside the edge of the shell.
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Old 08-15-06, 05:57 PM   #4
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Remove your bottom bracket and take a look inside of the bottom bracket shell at the little screw that holds the cable guide. File that sucker down flush. My bet is that'll solve your problem.
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Old 08-15-06, 06:48 PM   #5
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I have a Bianchi MTB that takes 68 mm BB. I installed a shimano UN73 and the non-drive side also did not seat flush. This was last fall and I've ridden the bike a lot with no problems at all (creaking, loosening etc......)

I did have the BB shell faced before installation but they did not remove enough metal to cause the gap.

Given that I've had no issues with mine I'd ride yours and not worry about it.
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Old 08-15-06, 06:50 PM   #6
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Same thing happened to me. I've been riding for several months without any problems.
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Old 08-15-06, 07:16 PM   #7
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The LBS just sold me a 73 mm BB and a couple of spacers... Seems to be fine.
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Old 08-15-06, 07:27 PM   #8
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Thanks for the reassurance. I'll see how it works. If the cranks fall off while I'm riding, I'll revive the thread!

Quote:
Remove your bottom bracket and take a look inside of the bottom bracket shell at the little screw that holds the cable guide. File that sucker down flush. My bet is that'll solve your problem.
I will have to file that screw. It wouldn't let me get the cartridge body in initially.

Thanks again,
Patrick
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Old 08-15-06, 07:47 PM   #9
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Quote:
Originally Posted by JunkYardBike
I will have to file that screw. It wouldn't let me get the cartridge body in initially.
BINGO! If that screw tips your cartridge is tipped upward, even a little, it won't let the non-drive side sleeve screw all of the way in.
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Old 08-15-06, 09:09 PM   #10
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Quote:
Originally Posted by Retro Grouch
BINGO! If that screw tips your cartridge is tipped upward, even a little, it won't let the non-drive side sleeve screw all of the way in.
Thanks for the tip. I installed it with the screw removed. I also checked the chainring rotation after installation, and it looks pretty good. No perceptible slant. But then again, my perception gets more slanted as I age.
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