Cracked Chris King BB

[Octave]

Anyone ever had a Chris King Threadfit BB fail? I've never seen anything quite like this and have no idea how it occurred. Heard an annoying creak yesterday while out riding and went to inspect, found this lovely crack all the way through the BB cup.

[gibbo]

I would contact them as they are supposed to have lifetime warranty.

https://chrisking.com/blogs/news/the...etime-warranty

[Octave]

Originally Posted by gibbo

I would contact them as they are supposed to have lifetime warranty.

https://chrisking.com/blogs/news/the...etime-warranty

Oh, I already have. Mostly I posted because I'm curious if a) others have experienced this and b) if anyone can offer an explanation to how this might have occurred. For reference, it was installed on a road bike with a White Industries R30 crankset. It's been ridden for about 30,000km with no problems and no significant use offroad (a handful of crushed limestone riding, but no "gravel")

[zmalwo]

Originally Posted by Octave

Oh, I already have. Mostly I posted because I'm curious if a) others have experienced this and b) if anyone can offer an explanation to how this might have occurred. For reference, it was installed on a road bike with a White Industries R30 crankset. It's been ridden for about 30,000km with no problems and no significant use offroad (a handful of crushed limestone riding, but no "gravel")

30k km sounds a lot for a BB....

[Octave]

Originally Posted by zmalwo

30k km sounds a lot for a BB....

Seriously? Bearing aside, a BB should last wayyyyy longer than 30,000km. I've run other CK or Phil Wood BBs for 100,000km (~4 years) without issue.

[oldpotatoe]

Originally Posted by Octave

Seriously? Bearing aside, a BB should last wayyyyy longer than 30,000km. I've run other CK or Phil Wood BBs for 100,000km (~4 years) without issue.

Yowser..I make that like 42miles+ per day, everyday for 4 years..

Good on ya...

[Octave]

Originally Posted by oldpotatoe

Yowser..I make that like 42miles+ per day, everyday for 4 years..

Good on ya...

Yeah, more or less. ~47mi/day during the week (ride + commute) then 100-120 on Saturday. Throw in a few extra-long bikepacking trips (100+ mi/day) and you've got a bit over 16,000mi/year. Hence why I like kit that lasts, which has been my experience with CK bits thus far. Hoping this is a fluke.

[oldpotatoe]

Originally Posted by Octave

Yeah, more or less. ~47mi/day during the week (ride + commute) then 100-120 on Saturday. Throw in a few extra-long bikepacking trips (100+ mi/day) and you've got a bit over 16,000mi/year. Hence why I like kit that lasts, which has been my experience with CK bits thus far. Hoping this is a fluke.

You must be single...

[Octave]

Originally Posted by oldpotatoe

You must be single...

Happily married for just shy of 5 years. Plus there's two jobs and a cat in the mix.

Just like the bike thing

[AngryScientist]

judging by the looks of that BB, it looks as if you may not have been using the best tool for install/remove. it's really pretty roughed up there?

[clyde the point]

Just rub a little cbd oil on it and it will be fine!

[jtakeda]

Is there a photo?

[happycampyer]

Originally Posted by clyde the point

Just rub a little cbd oil on it and it will be fine!

potd

[rwsaunders]

5 year warranty if one is the original owner and purchased before 2019...lifetime after 2019. There is recommended servicing and CK posts this information. It almost looks like it cracked when you removed the cup but who knows. Based on your mileage and at today’s prices, that bottom bracket cost $0.008/mile if I do the math correctly...pretty good.

https://cdn.shopify.com/s/files/1/29...56820612942588

[Octave]

Originally Posted by AngryScientist

judging by the looks of that BB, it looks as if you may not have been using the best tool for install/remove. it's really pretty roughed up there?

I used a Rotor branded BB tool (same outer diameter). It is a bit scuffed but the crack was noted mid-ride, well before I removed the BB.

Originally Posted by clyde the point

Just rub a little cbd oil on it and it will be fine!

Plus it'll cure the impending BB Alzheimer's, glaucoma and PTSD.

Originally Posted by rwsaunders

5 year warranty if one is the original owner and purchased before 2019...lifetime after 2019. There is recommended servicing and CK posts this information. It almost looks like it cracked when you removed the cup but who knows. Based on your mileage and at today’s prices, that bottom bracket cost $0.008/mile if I do the math correctly...pretty good.

https://cdn.shopify.com/s/files/1/29...56820612942588

True, pretty good $/mi in the end, frustrating nonetheless. I caught the crack when I went to inspect the crankset after noticing some noise during a ride, so the crack definitely didn't happen from removal.