Well the second in six months has just started grinding and clicking away. First on rusted away in less than a month, this one was done on warranty.

Is it a press fit as it looks very different than normal. I have a normal one, but not sure if the Diverge has a threaded shell; I need to get the back on the road asap…

I am going back to cotterpins asap at this rate!

If it’s a carbon frame then it’s pressfit. I have to say that I sold the original Praxis Works cranks and bottom bracket that came with the bike before I’d even used it. Reason being one bearing was a different size from the other. The cranks didn’t appeal to me both in appearance, weight and length. I got a Praxis BB30 to shimano Bottom Bracket and a Shimano crank set. The bearings are the same both sides which would facilitate replacement. When replacing coat the bearings in grease. I use marine grade grease. I haven’t had to replace the bearings in the bottom bracket with over 8000 miles all year riding and they still feel smooth.

Which model. The A1 has a standard external BB.

Its one of these, I have looked everywhere to get some specs; its been brilliant, but this BB is appaling; I may have to go for Hope or Chris King.

http://www.specializedconceptstore.co.uk/diverge-elite-smartweld/38040/16diverge

So can you put a threaded BB in a pressfit frame?

any thoughts? cannot find anything on sizes etc

Iirc the smartweld is pressfit so I would be looking at a wheels mfg one for around £60 they will last much longer. Should be available to order from any decent lbs

Cheers, I had a chat with Specialized and its going back to the shop.

Any thoughts on why they may fail?

I’d try pushing for them to get something better.

http://www.sigmasport.co.uk/item/Praxis-Works/OSBB-Converter-for-Specialized/3K3C
Details of that here http://www.praxiscycles.com/product/shimano-conversion-bb/

Or maybe the Hope version. http://www.hopetech.com/product/press-fit-pf46-bottom-bracket/

I know people who have and swear by the Praxxis. I am about to try the Hope version because the bearings are very serviceable, easily replaced if the worst happens and British.

PS – the Hope needs a special fitting tool….

Any thoughts on why they may fail?

Because it is a bearing exposed to British weather

Because it’s designed to be cheap to make,
rather than to last properly?

How many miles, out of interest?