So cool that this topic has come up. I just spec'd 40/26 with 12-23 9 speed cassette for my new Rawland Stag build. I've never used this combo before but came to this decision based on Grant's comments and some soul searching. I really monitored what gearing I regularly use on the same route using a compact double 48/34 and the same 12-23 cassette. Even with this the 48 ring kept me in the larger three rear cogs at the cadence I want to sustain for 30+ miles. Using the gear calc tool here ( http://home.earthlink.net/~mike.sherman/shift.html?R0=26&R1=40&R2=NaN&C0=12&C1=13&C2=14&C3=15&C4=16&C5=17&C6=19&C7=21&C8=23&C9=999&C10=999&CAS=0&WI=13&CR=170&RT=1&ST=0&RPM=90&SRT=0&lRPM=60&hRMP=100&G=show&S=yes&TITLE=Xd2&HL=1) I compared various combinations until I found one that gets me closer to the middle of the cassette on the big ring pushing between 70 and 80 gear inches at 80-90 RPM.
Jayme On Wednesday, June 19, 2013 2:21:23 PM UTC-5, Jay in Tel Aviv wrote: > > I'm intrigued by Grant's idea of 40-26 front gearing for my Sam Hillborne, > but Riv is out of their wide-low cranks and there's actually nothing wrong > with Sugino triple that's on there now. So I was wondering if it would be > possible to just replace the middle ring with a 40, and either replace the > outer ring with a bash guard or just leave it as is. Would the Tiagra > triple derailler I have on there work well with this configuration? > Obviously I could reset the limit screw to restrict its range to the inner > and middle rings. But could I also lower the mounting position to match the > middle ring? Or would the outer ring be in the way? > > If it works, this would be a neat way to try out wide-low gearing for the > price of 1 chain ring. Thoughts? > > Jay > > > -- 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 rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/groups/opt_out.
