What kind of bottom bracket is this and how do I change it?

[harrymfb]

What kind of BB is this? I tried using a standard crank puller but as the centre is hollow it had nothing to push against. What tool would I need?

 

[alecstilleyedye]

looks like an octalink. some say putting a 5p coin in the hole for the bb tool to push against works, i ended up with bent 5p coins and a trip to the lbs…

 

[midlife]

Yup. Looks like some form of Octalink...

 

[glasgowcyclist]

Here’s a video of the BB removal


View: https://youtu.be/uLBlr35bdPg

 

[Drago]

It's an Octalink V2. An Octalink crank extractor will do nicely. Best not faff about with washers or coins because if if goes wrong you can end up in a world of pain

 

[harrymfb]

It's an Octalink V2. An Octalink crank extractor will do nicely. Best not faff about with washers or coins because if if goes wrong you can end up in a world of pain

Thanks for the info I'll get myself one of those!

 

[harrymfb]

Here’s a video of the BB removal


View: https://youtu.be/uLBlr35bdPg

Thanks!

 

[Ajax Bay]

This gives a short useful overview of crank pullers. The Topeak one looks to deal well with both ST and Octalink
https://www.tredz.co.uk/bike-crank-pullers-workshop-tools

 

[rogerzilla]

There is a "mushroom" to fit into the hole and give the extractor something to pusg against.