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Bottom Bracket Adjustable cup doesn't go all the way in?

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Bottom Bracket Adjustable cup doesn't go all the way in?

Old 02-24-14, 05:19 PM
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j814wong
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Bottom Bracket Adjustable cup doesn't go all the way in?

Firstly, I am 100% certain that I got the right size bottom bracket for my bike. I checked that it was the same as my old bottom bracket's size. i installed right side first and screwed it all teh way in before screwing in the left side adjustable cup. However, that cup doesn't go all the way in. It looks to be 2 mm from the frame. Is this a problem?


I'm worried about trying to screw it in any more for fear that I might over-torque it.
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Old 02-24-14, 05:56 PM
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Originally Posted by j814wong View Post
Firstly, I am 100% certain that I got the right size bottom bracket for my bike. I checked that it was the same as my old bottom bracket's size. i installed right side first and screwed it all teh way in before screwing in the left side adjustable cup. However, that cup doesn't go all the way in. It looks to be 2 mm from the frame. ...
i have nothing to suggest as to a fix, but you might want to think about this: there is nothing to preclude the possibility that the BB that you removed was the wrong size.
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Old 02-24-14, 06:17 PM
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The BB might not be the same size. The BB might be slightly off axis and the LH cup might not be able to fully thread in past the RH side's end. The BB might be designed slightly differently WRT how the LH cup is meant to fit.

I'll install the RH side first and thread it mos all the way in. Then I'll install the LH cup almost all the way in. then go back to the RH and fully tighten it down solid to the BB face. then go back to the LH cup and tighten it to the point that feels right and tight.

Remember that the shell's tolerances are not held real close in many frames. So the LH cup has to have some room to "work with" and adjust for these slightly different shell dimensions. Sometimes the LH cup is fully within the shell. Sometimes it's a tad outside. Andy.
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Old 02-24-14, 06:20 PM
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what bike
what brand bottom bracket
what marking on the old one
what markings on the new one

most are not mind readers
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Old 02-24-14, 06:30 PM
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Are you allowing room for the lock ring?
IF this is a cartridge style, there is no "adjustable" cup.

IF it's a plastic cup and you fear breaking it, one trick I use is to seat the plastic cup first. You can apply a lot more torque on the metal DS cup.
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Old 02-24-14, 06:38 PM
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My bike is a Gravity Liberty CX from BikesDirect and the BB is a Shimano BB-ES25
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Old 02-24-14, 06:40 PM
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The adjustable cup is plastic.

I think I'll just go to my LBS to see what they can do.
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Old 02-24-14, 08:16 PM
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No, that is normal.
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Old 02-24-14, 08:33 PM
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Originally Posted by j814wong View Post
. . . I think I'll just go to my LBS to see what they can do.
Or, you might try something really crazy: install it exactly according to Shimano's instructions.
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Old 02-24-14, 08:48 PM
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Originally Posted by AnkleWork View Post
Or, you might try something really crazy: install it exactly according to Shimano's instructions.
There instructions for the bottom bracket don't show more than install the main body first then the adapter (adjustable cup).

https://techdocs.shimano.com/media/te...9830677388.pdf
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Old 02-24-14, 08:49 PM
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I did what Andrew Stewart suggested and was able to get the bottom bracket more centered though there is still a small gap where from the edge of the cups to the frame.

The distance is 1mm on each side give or take.
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Old 02-24-14, 09:22 PM
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Originally Posted by j814wong View Post
There instructions for the bottom bracket don't show more than install the main body first then the adapter (adjustable cup).

https://techdocs.shimano.com/media/te...9830677388.pdf
Where? Never mind. You probably should re-read that pdf.
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Old 02-24-14, 09:22 PM
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Be careful installing the plastic cup as they are fragile. Get it good and snug but no more. If it sticks out the 1 mm you say, it's no problem.

Last edited by HillRider; 02-25-14 at 07:27 AM. Reason: correct the usual typo
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Old 02-25-14, 12:01 AM
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As others said, you have a cartridge style bottom bracket. The left-side cup merely holds the cartridge in place. It does not need to thread all the way in. Having a few threads showing is normal and inconsequential.
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Old 02-25-14, 07:17 AM
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Originally Posted by j814wong View Post
I did what Andrew Stewart suggested and was able to get the bottom bracket more centered though there is still a small gap where from the edge of the cups to the frame.

The distance is 1mm on each side give or take.
You didn't understand what Andrew said. No matter what order you do things, you have to torque the right hand (drive side) down tight against the BB shell face. If that leaves threads showing on the left side, so be it. If you want the cartridge more centered, you have to use a spacer on the right side to tighten the cup against. There should be no unoccupied space between the cup and the shell on the right side. It must be tight. But 2mm on the left is perfectly normal. Don't bother with a spacer on the right, and don't leave space on the right. The right cup must be slammed tight.
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Old 02-25-14, 07:30 AM
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Originally Posted by rpenmanparker View Post
You didn't understand what Andrew said. No matter what order you do things, you have to torque the right hand (drive side) down tight against the BB shell face. If that leaves threads showing on the left side, so be it.
+100 The drive side cartridge MUST be TIGHT against the bb shell face. The recommended torque is very high (350-400 inch pounds or so) and that is important. Do not ever leave a gap between the drive side cartridge and the shell face.
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Old 02-25-14, 09:00 AM
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Originally Posted by rpenmanparker View Post
You didn't understand what Andrew said. No matter what order you do things, you have to torque the right hand (drive side) down tight against the BB shell face. If that leaves threads showing on the left side, so be it. If you want the cartridge more centered, you have to use a spacer on the right side to tighten the cup against. There should be no unoccupied space between the cup and the shell on the right side. It must be tight. But 2mm on the left is perfectly normal. Don't bother with a spacer on the right, and don't leave space on the right. The right cup must be slammed tight.
Thanks
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Old 02-25-14, 01:18 PM
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I think you got an E-type BB, considering the E in the part number. You could put a spacer on the drive side if you want, but it'll probably be OK as is.

EDIT: NM, those have a -E on the end.

Last edited by LesterOfPuppets; 02-25-14 at 01:21 PM.
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