Adam asked: "What determines how small a q factor a specific bike can have?"
In my view it starts with chain line, and a 135mm OLD rear end like a Hillborne "expects" a 47.5mm chain line. For a bike like that, getting into the 150mm range is pretty good. Bikes with a 130mm OLD "expect" a normal 43.5mm road chain line and give you a lower floor if you are looking to minimize Q-factor. I'm kind of Q-factor obsessed, and I maintain a number of 126mm OLD bikes just to facilitate that. I also have a 120mm OLD custom in the works with an ultra-narrow 41mm chain line to go even narrower. That machine will end up in the low 130s in Q-factor. 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. Bill Lindsay El Cerrito, CA On Wednesday, January 10, 2024 at 8:15:06 AM UTC-8 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-bunch+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/rbw-owners-bunch/1bd911e4-bfa1-4b61-a443-c1e0338162a0n%40googlegroups.com.
