Bottom bracket removal

SSmatty

Well-Known Member
any tips for removing the BB cups from an old frame?
I've got the left side out ok, but the right side seems stuck fast.
It has 1 1/2 inch flats on the cup, so I bought I wide jaw adjustable spanner, but that just slips.
I wonder if a proper 1 1/2 inch open ended would work or even clamp the flats in a bench vice and turn the frame.
I am cautious about heating the BB shell unless I really have to.

Advice please.
 
you do know one side unscrews the "wrong" way don't you ?
 
Location
Loch side.
any tips for removing the BB cups from an old frame?
I've got the left side out ok, but the right side seems stuck fast.
It has 1 1/2 inch flats on the cup, so I bought I wide jaw adjustable spanner, but that just slips.
I wonder if a proper 1 1/2 inch open ended would work or even clamp the flats in a bench vice and turn the frame.
I am cautious about heating the BB shell unless I really have to.

Advice please.
There is a special spanner for that job. Don't graunch it with a standard spanner that fits. The special one does not have an open end and helps to secure it. Then, once you have the spanner, don't rely entirely on it to hold the grip. The flats on the BB are so narrow that the slightest out-of-alignment or slip will make the spanner disengage. This damages the spanner and the BB.

What you have to do is rig a set of washers and bolts so that the spanner is bolted onto the BB. You rig this up by using the crank bolt and a bunch of spacers and stuff. As soon as the BB moves, you remove all of this because the BB needs space to unscrew.
 
OP
SSmatty

SSmatty

Well-Known Member
Where will I get one of those spanners?

Or is it a job for the lbs?
 
Location
Loch side.
Where will I get one of those spanners?

Or is it a job for the lbs?
It is a special bike tool and going out of style thanks to modern external cup BBs. Check with your shop.

If you have not yet damaged the flats, you can use a good quality open spanner but still try and bolt it to the workpiece.

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Chisel it out. I used a ratchet wrench with a flat head screwdriver socket attatched and a hammer, last time this happened to me . It looked, and sounded a bit brutal, but it worked.
 
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