https://www.paulcomp.com/wp-content/uploads/2025/03/PRNTCR04_2025.pdf
This Paul doc provides the q factor and chainline for each bottom bracket length and chainring combo for the Pure cranks. A safe way to ensure chainstay clearance would to try to match the q factor that Rivendell sends the bikes out with. However, if you are q sensitive, then you can shoot for a narrower q with an eye to chainstay clearance from the crank by experimenting with a narrower bottom bracket and using 3/6mm chainrings to achieve your desired chainrings. The offset chainrings will take care of chainring and tire/chainstay interface. I imagine I'd tolerate less clearance in my personal build than Riv would be willing to spec generally. This Paul system does seem clever since with a White Ind square taper crank, you can't narrow the bottom bracket/q factor without bringing the chainline in. They only offset the chainrings designed with their hollowtech-style cranks in mind. Though for each style of crank, they have road vs mountain crank arms with slightly different but still fairly wide q factors. And I often am trying to optimize what I have with a hope of not having to start from scratch with a new crank. Once you have some data, perhaps post the bb length, chainring offset, measured q factor and measured chainline as a data point for future Paul Pure users. Good luck! Zach in ABQ On Sunday, October 12, 2025 at 10:52:23 AM UTC-6 Bryan H wrote: > I am building a frame up, i have so far White industries 135mm hub w/ > microscoline driver, shimano XTR 10-51 12 speed cassette, Shimano Chain, > White industries 73x113 BB, Paul 100% cranks. The only remaining part i > need is a chainring. I am hoping the 113mm BB will work just fine and get > me the 52mm chainline with a 3mm offset ring. Well see what happens, i > would love to have the shop do it but i pride myself in doing my builds > myself and want to give it a go. Thank you all for your suggestions! > > On Sun, Oct 12, 2025 at 09:31 Hoch in UT <[email protected]> wrote: > >> Apologies if I missed this. But I’m fairly certain going 12-speed will >> then limit your chainring/crank options, especially if you’re ST. And >> wheels, since you need microspline. Basically, everything needs to be >> 12-speed specific. >> I did that with SRAM and found out the hard/expensive way. >> >> These days, I stick to good old 8-9 speed parts. >> >> On Saturday, October 11, 2025 at 7:13:36 AM UTC-6 Bryan H wrote: >> >>> Thank you everyone for suggestions! I have decided to go with shimano >>> 1x12 on my lugged susie. I am still figuring out chainline and which chain >>> ring to get. I posted in another thread but figured i would post it here as >>> well. I have purchased a white industries 73x113mm BB to pair them up with >>> paul 100% cranks. I am confused on which offset chainring i need to get the >>> correct chain line. When i look at pauls chart its recommending i need -3 >>> or -6 offset to achieve a 49mm or 52mm chain line. Which in todays >>> standards is very odd as most chainrings are 0, 3, 6mm. I am not even able >>> to find any minus chainrings for purchase. Any suggestions on this? I >>> attached a photo of Pauls chart, thank you! >>> >>> >>> >>> On Sunday, October 5, 2025 at 9:35:10 PM UTC-7 [email protected] wrote: >>> >>>> The GRX 822 showed up first and I installed it! I expected a 20g weight >>>> savings but it turned out to be more like 60g. The barrel adjuster is also >>>> quite nice, and the niggling clacking noise on my bike is now gone. (And >>>> to >>>> think I was suspecting that the frame was cracking when it was just a rear >>>> derailleur pulley going bad!) >>>> >>>> [image: PXL_20251005_223900079.MP.jpg] >>>> >>>> On Friday, October 3, 2025 at 9:03:23 AM UTC-7 Piaw Na wrote: >>>> >>>>> On Fri, Oct 3, 2025 at 8:56 AM Will Boericke <[email protected]> >>>>> wrote: >>>>> >>>>>> Piaw, >>>>>> >>>>>> I’m happy you posted this! My 5100 on a commuter lives a hard life. >>>>>> I disassembled, cleaned and greased and still have squeaks. I’ll order >>>>>> new >>>>>> pulleys. Perhaps replacement sealed bearing units? >>>>>> >>>>> >>>>> I ordered both a replacement pulley set and found on eBay the Ultegra >>>>> level GRX822 rear derailleur which will work as a replacement for the >>>>> entire derailleur for $80 + tax + shipping. (A new m5100 is $28 or so on >>>>> eBay, but I figured I can afford to splurge on fancy parts on my most >>>>> used >>>>> bike) We'll see which one gets to me first. >>>>> >>>> -- >> > 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 visit >> https://groups.google.com/d/msgid/rbw-owners-bunch/e8eec68c-295e-45fc-98ca-4f92c95e3c3an%40googlegroups.com >> >> <https://groups.google.com/d/msgid/rbw-owners-bunch/e8eec68c-295e-45fc-98ca-4f92c95e3c3an%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 [email protected]. To view this discussion visit https://groups.google.com/d/msgid/rbw-owners-bunch/08fc9caa-995f-43ec-ac8c-3d4bb3b53378n%40googlegroups.com.
