[Closed] Cracked BB shell?

Does look like a crack to me.😞

I'd still ride it though.

Can't think what else it could be on an anodised frame. As it's not gone all the way through, you could try and blend it out, (grind away with a Dremel until it disappears) but obviously if it's nearly all the way through you are going to weaken it or even risk holing it. Nothing much lost if it's got to that stage though.

Put a little puddle of wd40 or paraffin etc in the bb shell and see if it tracks through to the outside.

Is that a blob of over penetrated weld in the shell behind the crack? I would guess it has cracked along the edge of the weld.

Weld start/stop centred under the BB shell? Crack at at start/stop?

ISCG weld has a crater on the stop, needs downslope.

That looks like a Turner Burner.

OCD ?. I have never checked a frame for cracks never mind the inside of a B.B. shell 😁

your luck with the location though. Nice big ugly weld to fix won’t be noticed down there 😉

The blob of weld on the inside is forward of the crack. You can see the down tube hole in the photo.

I guess it might be along the line of the weld,  possibly under it, but certainly where the down tube meets  BB shell.

Yep, it's a turner burner! kudos to chunkyMtb!

I found it while chasing a creak. Swapped the BB and cranks in a process of elimination, while cleaning the threads and shell I noticed this crack. 😥

Disappointingy I had a turner flux that cracked on the top tube a few years ago.  My turner history isn't looking great!

So.... Next question..... Where do I get this welded in the South east?

Welded repairs to aluminium can cause problems by weakening tubes, particularly near to an existing weld

If it was my frame then I'd begin a regular inspection routine comparing the crack to the original photo. But it's not mine, and it isn't me that will suffer the consequences of the unrepaired crack worsening

Just an idea..

Can you drill the end of the crack both sides to stop it spreading then fill with an epoxy resin?

Damn! That be some fancy wall art from now on.

i doubt a welder to repair it would go anywhere near that!

such a shame, did you buy it from Silverfish UK as might be worth a try...

Yep..UK purchase about 4 years ago. So it's outside warranty.

Disappointing, I had a 26" wheeled DW flux that cracked by the top tube weld 3 years ago. Not really a great history so far with Turners! Shame as I love the way they ride.

My thoughts were exactly what shorty said up there.  Stop drill both ends of the crack, deburr, epoxy and ride.  They do this with aircraft all the time.

Saying that, I’d contact Turner directly.  You can see that the crack starts at the blob of weld material (very faint crack line), comes down at 30deg and then starts a bigger crack in-line along the axis of the BB shell.  That’s a major manufacturing fault and Turner may be interested to see it.

Yep... I've emailed turner. I'll see what they say.

Epoxy.. That's not a bad idea

So.... Dave Turner got back tom me.

"

Rarely is a cracked frame OK to ride, but you can ride this with confidence. Keep an eye on it of course, but it will only be a problem when you see it breaking thru to the outside, and following the weld around the end of the downtube. That may take dozens of rides or never.... watch the underside of BB and downtube weld as well as the rest of the bike,  and have a good ride.

"

After some further conversation, if I don't feel happy riding it, he's offered me a good deal on the Turner trade in program, so I could go for an RFX for what would be a great price.  Although by the time I've paid import duty, new BB, for air shaft swap etc, it still isn't a cheap "upgrade". But it would be shiny new carbon frame. 🙂

On one hand I'm slightly worried about riding a cracked frame, but if DT himself thinks it will be ok, then maybe I should just ride it.  Assuming I can get my head around that! I think the drilling / epoxy route might be a good mitigating option as well.  Then if / when it's toast, I can look at the wider market for new bikes.

Would anyone else ride it with that in mind?

Would anyone else ride it with that in mind?

If Dave Turner says it's good to ride, then it's good to ride - really. Being honest, even without this, I wouldn't worry about it and would just keep an eye on it. Even if it did fail, I can't see it failing catastrophically (i.e. where it costs you teeth) so I would say you're safe.

Enjoy riding the bike 🙂

If you're going to ride it on the strength of DTs advice and look at a trade in when it does fail, I'd not bother messing with it by drilling and filling. You could get blamed for causing it. If you're going to ride it, just ride it as it is.

I think if I'm going to just ride it then I'll miss the boat on the generous special trade in price (although Turner offer $600 discount on a trade in as standard anyway, regardless of condition / age ).

So, if I ride it, it'll be until it either fails or I change the bike anyway (either way, likely not for another Turner). This is why I though about the drilling option as it might reduce the likelihood of the crack propagating further. Or I weaken it further by doing this and it fails riding down my garden path!

I would just ride it and not mess with it.  You could mark each end of the crack with a sharpie and just check it every-now and then.

Sharpie mark - good idea.

I don't really want to buy a new bike or frame a the moment so I think just ride is the preferred option. 🙂