Shimano SM-BBR60 (BSA) Ultegra Bottom Bracket

Product Information

Begley M, Gahan CG, Hill C (2005) The interaction between bacteria and bile. FEMS Microbiol Rev 29(4):625–651. https://doi.org/10.1016/j.femsre.2004.09.003 Threadfit 82.5 is not really a new standard in that it is compatible with BB86 cranksets and bearings. 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.” Other notes Asymmetric BB shell which is wider on non-driveside. Wider overall shell is also claimed to improve bearing support PF30 However Shimano advertise that SM-BBR60 & BB-R9100 use 'small ball bearings'. This is not necessarily a good thing, in that smaller bearings are weaker. However there are more of them. Still it would be reasonable to assume that the RS500 will be DIFFERENT in durability from the other two, but not necessarily worse.

BB30’s larger 30mm-diameter spindle, compared to the standard 24mm size, allows the use of lighter alloy Immediate Media The idea is simple, by moving the bearings outboard of the shell, you can then use a much larger spindle. Currently, 24mm is the accepted norm compared to square-taper’s relatively minuscule 17mm diameter. Crank compatibility is another BB386 EVO strongpoint. Despite the bulbous dimensions, the shell will accept most modern crankset fitments save for dedicated BB30/PF30 and BBRight designs. SRAM claims that the focus on optimising the bearings resulted in a spindle diameter of 28.99mm. This places is right between SRAM’s old 24mm GXP cranks and 30mm spindles of modern cranks.

Shimano Ultegra / FC-CX70 / 105 bottom bracket SM-BBR60 - smooth running, low weight

Cons: Same as BB90/95 in theory, but in practice there are generally less issues experienced due to the less stringent tolerances Our] Hollowgram SiSL2 crank with SpideRing weighs 484g. By comparison, Dura-Ace 9000 weighs around 678g [we recorded 637g in our review – ed]. In addition to weight, another BB30 advantage is stiffness. By increasing the spindle diameter, you increase its resistance to twisting, which is where the bulk of the deflection in a crankset comes from. Roughly 70% of total deflection measured at the pedal comes from axle twist.” http://www.chainreactioncycles.com/us/en/shimano-ultegra-6800-11-speed-groupset/rp-prod110818?utm_campaign=bazaarvoice&utm_medium=Default&utm_source=AskAndAnswer&utm_content=Default

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. Cons: Metal-on-metal interfaces can be prone to creaking; requires a separate bearing puller and press for service; requires high manufacturing tolerances; bearing seats can’t easily be faced post-manufacturing; not all BB30 cranks will fit

Colnago ThreadFit 82.5 bottom brackets

With the PressFit 30, they’re using the same technology with the larger bearings and the same technology with the bearings living inside the frame, but they’re utilizing the nylon to their advantage where you have a more realistic tolerance.”