On Monday, June 10, 2019 at 8:41:00 PM UTC-7, jbeattie wrote:
On Monday, June 10, 2019 at 9:54:34 AM UTC-7, Tom Kunich wrote:
On Monday, June 10, 2019 at 7:43:08 AM UTC-7, AMuzi wrote:
On 6/10/2019 9:28 AM, Frank Krygowski wrote:
On Monday, June 10, 2019 at 9:04:29 AM UTC-4, AMuzi wrote:
Standards are great! We ought to have more of them!

https://www.bikeradar.com/news/2020-...ockett-t47-bb/

But this one: "Launched back in 2015, the T47 BB standard was a collaboration between Chris King and Argonaut Cycles, and was designed to cure the creeks associated with PF30 BBs."

Will the creeks run dry?


At the end of the last century, 650B 584 was finally dead, a
stake mercifully driven through its heart. But, zombielike,
it returned as the rolling dead. We can only hope to drop
Campagnolo carbon SuperRecord 12 cranks into our Chater-Lea
frames soon!

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971


Don't you think that it is about time that real attention was paid to the lowly bottom bracket which was always just jammed in there like an after-thought? The narrower BB's are more efficient but the problem has been the creaking. Replacing the press-fit bearings for a screw-in is actually an intelligent idea. It reduces the weight of the BB shell because it doesn't require the rigidity of a press fit BB.

BBs have gotten more attention than any other frame component in the last 10-15 years. https://wheelsmfg.com/bb-standards Too much attention. They should have gotten less attention. And before we changed the shells, we had to cycle through ISIS and Octalink. I think we hit the pinnacle with Shimano $16 outboard bearings in a threaded BB with a Hollowtec crank. https://www.jensonusa.com/Shimano-BB...Eg rQYdKwAN1A Or a Campy equivalent if you're into Italiano.

I could see super-sizing the standard threaded format to get more real estate at the BB junction on CF frames. But if the standard died out like Chater-Lea, you'd be screwed. Maybe you could still use PF30. I don't know. The good part about the BB30 direct mount (not PF) formats is that you just have to squeeze in standard 6806 bearings, a standard that is used in other applications, and for me, they stay quiet with some Loctite 609.

-- Jay Beattie.

I wouldn't be against a BB of just sealed bearings except for the reports of these causing the housing to wear and the bearings to pull out with the removal of the cranks.