Is this a self extracting BB bolt?

[02GF74]

As in photo. The cranks I have taken off up to now have a cap that unscrews to reveal a hex headed bolt. This is undone then a crank extracter screws into the crank to pull it off.

This new fangled jobbie has a allen key bolt that sits inside another hollow bolt with two little holes - no doubt there is some toool with 2 little pins to undo this.

Am I correct in thinking all I need to do is to undo the allen bolt and it will pull the crank off? It is quite tight, as expected perhaps, but I don't want to risk damaging the crank.

If I undid the outer bolt(?), would I then be able to use a crank extractor as per normal?

Never done one of these before....

 

[Tim Bennet.]

Yes
Yes
Yes

They seem like a good idea, but I've never found they exert the same separating force as a crank puller. Sometimes it just feels 'wrong' applying the pressure needed to separate some cranks with them.

The outer ring is unwound with a Park pin spanner. But take care - the holes are easy to bugger up.

 

[mickle]

Self extractors work really well with splined BBs, not so well with square taper IME. I've had nothing but bad experiences on square taper. If you have a square taper BB I would recommend ditching the SE Bolts and using a proper crank puller.

Pedros have copied/licensed Campag's classic crank extractor, great design, cheaper and easier to source than Campag tools.

 

[02GF74]

googling helped too... seems it is recommended to not rely on the self-extracting unless in an emergency so remove the self-extracting thingy then remove cranks with an extractor.

the bb is splined btw.

 

[briank]

That's a Shimano Octalink BB and crank that is. Eight splines,see?
Not that it matters.

 

[robbarker]

Yep, it's a so-called "one-key release" crank. I don't trust them and use a pin spanner and chainset remover. (It's octalink so you need the specific tool like this or a conventional crank remover plus "mushroom")