Sold SKF Isis BB

BXC is the lighter ‘XC’ model

The 400 series was their mid tier (cro mo spindle)

The 600 series
Our top of the line bottom bracket unit is made entirely of stainless steel or stainless materials to ultimate strength. This will ensure a long life even under the most severe conditions.

* Stainless steel: spindle, shell, rollers and balls
* Aluminium: stoprings and sleeve


The 450 series
This series offers the optimum compromise between cost and value. The more critical part towards corrosion – the shell – is made of stainless steel, while the spindle is made of the cheaper, coated CroMoly.

* Stainless steel: shell, rollers and balls
* Coated CroMoly: spindle
* Aluminium: stoprings and sleeve


The 300 series
This is our basic series and it comes with exactly the same revolutionary bearing design, axial seals, one-piece shell and oversized spindle like the more expensive 600 and 450 series. With the 300 series we can offer an incredible value for money.

* Stainless steel: rollers and balls
* Coated CroMoly: spindle and shell
* Aluminium: stoprings and sleeve
 
I think this is the right size for my FRM cranks. I was going to check, but I'll take it please as a potential upgrade and if it's not right it can go into the large BB collection.
 
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