SHIMANO Bottom Bracket BBR60-68mm English Thread.

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I'm actually wondering about the Tiagra bb RS500, which seems massive, compared to BBR60 and DuraAce bb. Anyone taken one of those apart? Are the bearings bigger or just the shells?

This system has a number of different names depending on who you talk to. It is also called PF86, PF92, PF24 (Chris King) and PF41 (Hope). As stiffness is directly tied to cross-sectional size it’s no surprise that, theoretically, BB386 EVO has the most to offer, with both the added shell width and diameter that many frame-makers yearn for. PF30, OSBB, BB386EVO if it matches the spindle length, BB30A if the crankset has spacers on the left side

Colnago ThreadFit 82.5 bottom brackets

Because the crank arms are straighter, we can make them lighter than BB30 ones,” he says. “But because the BB386 EVO spindles are longer than BB30 ones, they aren’t as stiff. Total stiffness is not a measure of crank stiffness alone, though. When you factor in the stiffness gains from a wider shell, the overall stiffness will be highest when BB386 EVO frames meet BB386 EVO cranks.” The need for a heavier metal interface looked like a limiting factor for mass-produced carbon bikes, but with a manufacturer like Trek on now on board (as mentioned above, its 2020 Domane features a T47 BB) that could all be about to change. Specialized‘s OSBB system is nearly identical to BB/PF30 but with a few key differences, according to the company’s director of advanced research, Chris D’Aluisio.

Smith (March 23, 2001). "International Spline Interface Standard". www.isisdrive.com. Archived from the original on 2018-07-14 . Retrieved 2019-02-14. Pros: Lighter than conventional setups but retains compatibility with ‘legacy’ cranksets; creates a wider BB shell without affecting crank width Pros: Easy at-home service; interface surfaces can often be machined; huge selection of parts and accessories Scott US marketing and PR director Adrian Montgomery touts similar reasons for his company choosing BB86/92 over other standards:Schlumpf Innovations: Mountain Drive". 2005. Archived from the original on 2007-10-30 . Retrieved 2007-11-18. BMC / Bianchi / Bulls / Canyon / Cervelo / Colnago / Cube / Focus / Giant / Ridley 2019 onward / Scott / Sensa / Trek / Cannondale / Koga / Lapierre / Pinarello / Stevens Other notes Asymmetric BB shell which is wider on non-driveside. Wider overall shell is also claimed to improve bearing support PF30 Put another way, you’re sitting on a lemon – and in this case, no amount of sugar is going to make it taste good. In recent years Shimano has migrated much of their product line away from square taper to a spline attachment called Octalink and to external bearing types. In late 2006, Campagnolo announced that it was abandoning the square taper interface for double chainsets in favor of an outboard bearing design called Ultra-Torque, which uses a splined interface between spindle halves.