Bill, As a fellow Q nerd, this is a really good mention:
*A lot of people with 135mm OLD Rivendell Road bikes will set up their double with 43.5mm chain line anyway, thinking of it more as a 1x plus granny setup. Swing the whole cassette in the big ring and only use the larger 4 cogs in the small ring. Doing that would probably bring <150mm Q-factor into play for your Hillborne. * If I do not set a perfect chainline on a 2x bike, it is always skewed to the inside for reduced Q and shifting habits as described above. Although, I generally run a 108mm vs. 113mm for WI VBC as an example so I generally only go from 47.5mm to 45mm chainline and 150mm to 145mm Q. -Justus Mpls, MN On Wednesday, January 10, 2024 at 12:27:25 PM UTC-6 J G wrote: > This one is a little harder or more restrictive as you cannot use a > middle/outer combo for a 94bcd double/triple with the 26t and requires the > use of the granny ring for most triples, which works against low-Q: > > *What are options for double cranksets that are around 40/26 or so?* > > White Industries VBC road cranks is what I tend to use for doubles in the > range of 24/38 up to 28/42 and the Q is not quite in the 140s but a flat > 150mm on a 113mm BB. > > -Justus > Mpls, MN > > On Wednesday, January 10, 2024 at 12:21:12 PM UTC-6 J G wrote: > >> Adam, >> >> Regarding: >> >> *does swapping the large ring for a bash guard allow for a lower Q? I >> assumed that would stay the same?* >> >> No, in fact this would create a higher Q if implemented properly. >> Chainline is now between middle and small rings with a bash and need >> longer BB spindle to achieve proper chainline, resulting in higher Q. >> >> The best use of triples for low-Q doubles are ones where the granny ring >> has spacers that can be removed. Cranks like the old Ritchey Logic and >> Suntour XC Pro (among others) can be run with middle/large rings only and a >> shorter BB spindle for proper chainline between middle and large in this >> implementation and lower-Q. >> >> On Wednesday, January 10, 2024 at 12:09:37 PM UTC-6 Josiah Anderson wrote: >> >>> Uhh... because lower Q works better for some people? That's like asking >>> why someone wants a longer/shorter stem... >>> >>> Adam, with the VO cranks (if we're thinking of the same ones) if you can >>> get a set of arms without rings, TA rings will fit, which are available in >>> any tooth count down to 26 IIRC. 40/26 is definitely possible with the TA >>> 50.4bcd rings. You could also watch eBay etc for used TA cyclotouriste/pro >>> 5 vis cranks, which is what the VO and SunXCD cranks are copies of. >>> >>> Josiah Anderson >>> Missoula MT >>> >>> >>> Le mer. 10 janv. 2024 à 9:47 AM, Bill Schairer <comm...@gmail.com> a >>> écrit : >>> >>>> Since you stated you are a bit new to all of this, I am curious as to >>>> exactly why you are so focused on a lower Q? >>>> >>>> Bill S >>>> San Diego >>>> >>>> On Wednesday, January 10, 2024 at 9:26:06 AM UTC-8 Adam wrote: >>>> >>>>> Thanks, >>>>> >>>>> Great ideas already. I have thought about the VO cranks, but want >>>>> slightly lower gearing if I'm going to the trouble of swapping. >>>>> >>>>> For Ron, or anyone else, does swapping the large ring for a bash guard >>>>> allow for a lower Q? I assumed that would stay the same? >>>>> >>>>> I'm going to look at the Alex cycle option, your pic is exactly what I >>>>> want to do. Is there a clever way to piece something like that together >>>>> from older stuff on eBay? Guessing it may take knowledge I don't have >>>>> >>>>> Adam >>>>> >>>>> On Wednesday, January 10, 2024 at 11:15:31 AM UTC-6 Ron Mc wrote: >>>>> >>>>>> adding a ps - another use of your triple crank, there are some >>>>>> virtually weightless bash guards out there if you want to make it a >>>>>> compact >>>>>> double. >>>>>> >>>>>> [image: Rw6vTY9.jpg] >>>>>> >>>>>> On Wednesday, January 10, 2024 at 10:44:54 AM UTC-6 Ron Mc wrote: >>>>>> >>>>>>> Hi Adam, >>>>>>> take a look at VO Rando crank. >>>>>>> If you can find them, Sun XCD makes their 50.8 BCD and chainrings, >>>>>>> which I'm running on 2 bikes. . >>>>>>> I was on SJS Cycles last night looking at rings, and noticed they >>>>>>> still have some T/A-5 chainrings. >>>>>>> On Wednesday, January 10, 2024 at 10:15:06 AM UTC-6 Adam wrote: >>>>>>> >>>>>>>> Hi all, >>>>>>>> >>>>>>>> Adjacent to the triples thread, I'm thinking about moving away from >>>>>>>> a triple to a double in order to get a lower Q. >>>>>>>> >>>>>>>> What are options for double cranksets that are around 40/26 or so? >>>>>>>> I think that would be doable with the Rene Herse cranks, but too much >>>>>>>> $$$ >>>>>>>> for me. Are there any cheaper options that will do that and give me a >>>>>>>> q in >>>>>>>> the 140s? >>>>>>>> >>>>>>>> Second, drivetrain stuff is a little new to me. What determines how >>>>>>>> small a q factor a specific bike can have? I'm assuming chainstays >>>>>>>> play a >>>>>>>> role here? This hypothetical project is for a Hillborne, so I'd be >>>>>>>> curious >>>>>>>> what folks have used to get low q on their Hillbornes. I'm assuming I >>>>>>>> may >>>>>>>> have to change the BB as well. >>>>>>>> >>>>>>>> Thanks! >>>>>>>> >>>>>>>> Adam >>>>>>>> >>>>>>> -- >>>> 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-bun...@googlegroups.com. >>>> To view this discussion on the web visit >>>> https://groups.google.com/d/msgid/rbw-owners-bunch/a82cfe04-9719-4991-9de9-ad164a0c59d6n%40googlegroups.com >>>> >>>> <https://groups.google.com/d/msgid/rbw-owners-bunch/a82cfe04-9719-4991-9de9-ad164a0c59d6n%40googlegroups.com?utm_medium=email&utm_source=footer> >>>> . >>>> >>>> -- 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. 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