How to remove a DUB crankset with a rounded\stripped extractor bolt?

[guidodg]

Does anyone have advice on how to remove a DUB crankset with a rounded\stripped extractor bolt?

It is  the alloy variety which seems crazy for a bolt that gets torqued to high values...will definitely replace it with a steel one if I can get it off.

Alternatively where can I take it to be done in Cape Town?

thanks!

Edited August 14, 2025 by guidodg

[BuffsVintageBikes]

As a first step, I'd drive an oversize Hex bit into the stripped hole with a hammer and then try again. Try shock it loose rather than just pushing down on it, so use a hammer on the Hex bit. I've had success in the past doing this but on something different. Looks very dry in there as well, try soaking with some penetrating fluid first.

Edited August 14, 2025 by BuffsVintageBikes

[DieselnDust]

Try an oversize torx driver first, this will drive the corners of the bolt. If not, drill the thing out since it’s aluminium and buy a new one. They’re relatively cheap……relatively

[Geco Cycles]

We can remove it for you.

021 982 3446

Based in Brackenfell

 

[droo]

You'll need a big bit though, think it's an M16 thread. Once you've got the head off you should be able to extract the shank with your fingers.

Replacement bolts are cheapish.

[Max Headroom]

On 8/14/2025 at 1:06 PM, guidodg said:

Does anyone have advice on how to remove a DUB crankset with a rounded\stripped extractor bolt?

It is  the alloy variety which seems crazy for a bolt that gets torqued to high values...will definitely replace it with a steel one if I can get it off.

Alternatively where can I take it to be done in Cape Town?

thanks!

[DieselnDust]

31 minutes ago, Max Headroom said:

If you break those cheap Brittle self extractors off in the extraction /retention bolt you’re in a world of trouble to get it out

[droo]

22 hours ago, DieselnDust said:

When you break those cheap Brittle self extractors off in the extraction /retention bolt you’re in a world of trouble to get it out

Fixed. 

A galled M16x1 aluminium thread will laugh at an EZ-Out, no matter how much you paid for it.

[Mongoose!]

If everything else fails, there is only one solution .... new bike day 🤷‍♀️

[Geco Cycles]

We have removed plenty of those bolts. 

So the offer stands. Bring the bike and we will remove it and fit the replacement for you.

[guidodg]

1 minute ago, Geco Cycles said:

We have removed plenty of those bolts. 

So the offer stands. Bring the bike and we will remove it and fit the replacement for you.

preferably a steel one👍

[DieselnDust]

14 minutes ago, guidodg said:

preferably a steel one👍

 O such thing as far as I know. Just replace once every two years or use a decent Allen key set where the fit is tight

[guidodg]

9 minutes ago, DieselnDust said:

 O such thing as far as I know. Just replace once every two years or use a decent Allen key set where the fit is tight

the assembly at left is 13 g heavier than the aluminum one at right owing to the former’s steel bolt, but it also works much better.

https://nminus1bikes.substack.com/p/stop-skinning-your-knuckles-on-crazy

Edited August 16, 2025 by guidodg

[Kom]

Ali have titanium replacements which i recommend:
https://a.aliexpress.com/_mMufBql

Pricey tho.

[DieselnDust]

2 hours ago, guidodg said:

the assembly at left is 13 g heavier than the aluminum one at right owing to the former’s steel bolt, but it also works much better.

https://nminus1bikes.substack.com/p/stop-skinning-your-knuckles-on-crazy

Excellent thank you!!

[guidodg]

ok, sorted thanks to RA Cycles in Smst West....and they had a SRAM DUB steel extractor bolt to sell me!