Scott, the RD total capacity is the sum of the difference between the high and low of the cassette and the crank. So 29 for the cassette and 20 for the crank = 49. While this exceeds the capacity, you can get away with using it "if" you don't run the 46t ring and the 40t cog, which you shouldn't anyways, but not everyone understands this. Do you ? Depending on the brand the cogs are 11-13-15-18-22-28-34-40 or 22-27-33-40. Doesn't matter. If the 34 is your highest usable cog for the 40t ring, then that'll work. If you're casual or forgetful about using the big cog and big ring, well then forget that !
On Thursday, July 20, 2023 at 1:07:26 PM UTC-4 greenteadrinkers wrote: > I have a V/O wide double crankset that has 46/26 rings, I'm considering > buying the Shimano, Acera M3020 which is rated to 40 teeth, and matching it > with an 11-40 Shimano 8-speed wide range cassette that Riv sells. I plan to > keep it friction. > > The max front difference for the RD is 20 teeth, so 46–26= 20. > > The total stated capacity of the Acera is 45 teeth, I'm not clear what > this means or how to calculate that figure. > > Would there be a reason the combination of chainrings, cassette, and rear > derailleur would not play well? > > Thanks! > Scott > -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/rbw-owners-bunch/78af2016-3fdb-470b-8878-b41d10aee40fn%40googlegroups.com.
