Shimano SM-BBR60 (BSA) Ultegra Bottom Bracket

Product Information

Cranksets with 30 mm wide spindles won’t fit into frames with BB86, or BB90 BBs, but with correct BB some can be made to fit into threaded frames. Ridlon JM, Kang DJ, Hylemon PB (2006) Bile salt biotransformations by human intestinal bacteria. J Lipid Res 47(2):241–259. https://doi.org/10.1194/jlr.R500013-JLR200 Crank designs that will fit: Standard 24mm external-type only. A GXP conversion kit is also available

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. Boris S, Suarez JE, Barbes C (1997) Characterization of the aggregation promoting factor from Lactobacillus gasseri, a vaginal isolate. J Appl Microbiol 83(4):413–420. https://doi.org/10.1046/j.1365-2672.1997.00250.x Other notes Aims to solve creaking issues of press fit systems. Essentially an oversized BSA external BB Thread Fit 82.5 And here's where my problem is, I have no idea whether a BB I'm considering will fit the bike or not.Cervélo introduced the new BBright system on the R5ca, and while it offers some sound engineering advantages, other companies have been slow to adopt it Immediate Media In terms of both BBs and cranksets, of course. There are so many (in)compatible standards and how not to get confused or get mismatching equipment? Just follow these simple steps: Technically only the R9100 is considered 'Dura-Ace', the others are 'non-series'. In any case they are all interchangeable - you can use BB-RS500 with an R9100 crankset. For us, there are no disadvantages versus a threaded design or a standard BB30. We are able to have a full carbon shell with no metal bonded into the frame, which makes for a stronger, lighter frame structure.

Compatibility Originally designed for 24mm spindles, but some BBs that fit a 30mm spindle are available 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.” Cullis J, Siolas D, Avanzi A, Barui S, Maitra A, Bar-Sagi D (2017) Macropinocytosis of nab-paclitaxel drives macrophage activation in pancreatic cancer. Cancer Immunol Res 5(3):182–190. https://doi.org/10.1158/2326-6066.CIR-16-0125 Blacher E, Bashiardes S, Shapiro H et al (2019) Potential roles of gut microbiome and metabolites in modulating ALS in mice. Nature 572(7770):474–480. https://doi.org/10.1038/s41586-019-1443-5 Pros: Same as BB30 but with lower costs, easier assembly, and the potential for additional bearing seals integrated into the cup/bearing assemblyShi Y, Zheng W, Yang K et al (2020) Intratumoral accumulation of gut microbiota facilitates CD47-based immunotherapy via STING signaling. J Exp Med 217(5). https://doi.org/10.1084/jem.20192282 Cons: Can’t use cup-mounted chain guides; shell is wider but still small in diameter; requires a separate bearing puller and press for service, bearing bores can wear out and loose tolerances

Cons: Shell still just 68mm wide; 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 Miura K, Kodama Y, Inokuchi S et al (2010) Toll-like receptor 9 promotes steatohepatitis by induction of interleukin-1beta in mice. Gastroenterol 139(1):323–334e327. https://doi.org/10.1053/j.gastro.2010.03.052 The road standard has an 86.5mm shell width (hence BB86) whilst the mountain bike standard has a 91.5mm shell width. A number of other shell widths may also exist, though they all use the same bearing cups. 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. Ouyang W, O’Garra A (2019) IL-10 family cytokines IL-10 and IL-22: from basic science to clinical translation. Immunity 50(4):871–891. https://doi.org/10.1016/j.immuni.2019.03.020BB30’s larger 30mm-diameter spindle, compared to the standard 24mm size, allows the use of lighter alloy Immediate Media Trek’s BB90 system uses the same bearings and bearing locations as a conventional threaded system, but eliminates the cups entirely. Bearings are pressed directly into precision-molded carbon seats Immediate Media Krysko DV, Garg AD, Kaczmarek A, Krysko O, Agostinis P, Vandenabeele P (2012) Immunogenic cell death and DAMPs in cancer therapy. Nat Rev Cancer 12(12):860–875. https://doi.org/10.1038/nrc3380 The tolerances are not too different but the way they’re measured is. They both have the same needs for concentricity and placement relative to the frame. The threads are at a disadvantage in that they need to be machined from both sides and have a hard time sharing a centerline, whereas our OSBB is machined from one side all at once — and round holes are easy to measure.”