Pressfit BB loose in Mtb frame

[wessie12]

Good day guys 

Looking for hubland advice 

I have 2019 Silverback Sesta frame with a pressfit bottom bracket.  Noticed that the non drive side has a play on the BB shell. I have no idea how it happened. The BB is literally loose.Is there any way to fix this ? was thinking in the line of loctite,  a shim or something but I would appreciate any advice  from someone who sorted this out

[David Marshall]

6 minutes ago, wessie12 said:

Good day guys 

Looking for hubland advice 

I have 2019 Silverback Sesta frame with a pressfit bottom bracket.  Noticed that the non drive side has a play on the BB shell. I have no idea how it happened. The BB is literally loose.Is there any way to fix this ? was thinking in the line of loctite,  a shim or something but I would appreciate any advice  from someone who sorted this out

It is not an uncommon problem and usually happens only on the non drive side. This is because of the torque differential between the crank arms.

You have a couple of options.

You can fit the bb with some paste like epoxy (I use Epidermix 372 - because that is what I have) or else with a gap filling Loctite (like Loctite 638). Neither of these products are cheap as the pack sizes are relatively large.

A preferred option is to fit a screw together pressfit bb.  Enduro have the full range so you should be able to get from a bike shop.  There are other brands (Token, Praxis, Wheels Manufacturing). Also not cheap but they are a once off purchase.

The advantage of these is that you can replace the bearings without removing the screw together shell.

Back in the day we used to shim loose headset cups with a sliver of aluminium cut from a beer can. It had to be imported beer because the local cans were too thick. Now days any cold drink can will do. You always had some of the shim left protruding which you could remove with a sharp blade.

This should work for a bb as well.

[love2fly]

1 hour ago, David Marshall said:

It is not an uncommon problem and usually happens only on the non drive side. This is because of the torque differential between the crank arms.

You have a couple of options.

You can fit the bb with some paste like epoxy (I use Epidermix 372 - because that is what I have) or else with a gap filling Loctite (like Loctite 638). Neither of these products are cheap as the pack sizes are relatively large.

A preferred option is to fit a screw together pressfit bb.  Enduro have the full range so you should be able to get from a bike shop.  There are other brands (Token, Praxis, Wheels Manufacturing). Also not cheap but they are a once off purchase.

The advantage of these is that you can replace the bearings without removing the screw together shell.

Back in the day we used to shim loose headset cups with a sliver of aluminium cut from a beer can. It had to be imported beer because the local cans were too thick. Now days any cold drink can will do. You always had some of the shim left protruding which you could remove with a sharp blade.

This should work for a bb as well.

I switched to the Wheels Manufacturing option years ago on my MTB. Great option. 

[DieselnDust]

LOCTIRE 638 bearing retaining compound and a thread together BB like those mentioned above is the answer.

The alternative is a carbon repair shop which is a more expensive options but will sort the problem for good.