Laing, I've puzzled about how to take crank length into account and this seems like a great idea. I'll give it a try. But at the end of the day, anything that is a fairly reproducible number for an individual gets the job done. I have a seamstress tape with a little rivet on the end that grabs the top of the hole where the crank bolt goes and it gets the zero point of the tape close enough to the center of the crank that it's never been a problem, or at least it keeps my measurements fairly consistent.
Paul in AR On Monday, December 12, 2022 at 2:41:33 PM UTC-6 lconley wrote: > I have never understood why any body is concerned "saddle height" which as > I understand it is the distance from the CL of the crank to the top of the > saddle, inline with the seat tube. It is very hard to measure from the > center of the crank and what if you have bikes with different crank > lengths?. I put the crank low and in-line with the seat tube and measure > from the top of the pedal axle to the top of the saddle, inline with the > seat tube - takes the crank length out of the equation. I used 35" when I > was younger, but now use 34". It is constant from bike to bike, no worrying > about crank length, nor trying to line up the end of the tape with the > centerline of the crank at the same time as trying read the tape at the > saddle. > > Laing > Delray Beach FL > > On Monday, December 12, 2022 at 12:49:07 PM UTC-5 Jay Lonner wrote: > >> I just took delivery of a new (non-Riv) bike and am dialing in the fit. >> I’m a little worried that the frame is too big for me, since I only have >> maybe 2” standover, which seems tight for a gravel bike. >> >> So I went out and measured the saddle height on my Hunq (which is a size >> 62). It came in at about 75cm. This gives me a solid fistful of seatpost. >> Then I remeasured my PBH, which is 93-94 cm depending on hard I pull. For >> reference, here’s the relevant page from HQ: >> >> https://www.rivbike.com/pages/pubic-bone-height-how-to-measure-your-pbh >> >> This suggests that based on my PBH my saddle height should be closer to >> 83 cm – an 8cm discrepancy. Before riding in this morning I raised my >> saddle height to 79 cm, basically splitting the difference. It felt weird, >> which of course it would after so many years at 75cm. But I made it in and >> my feet were in full contact with the pedals without any tippytoe >> maneuvers. So I guess I’ve been doing it wrong this whole time? Kind of >> embarrassing. Even so, according to the Riv method my saddle height is >> still ~4cm lower than my PBH would suggest. >> >> So I guess I’m wondering about alternative ways of determining saddle >> height somewhat objectively, and/or whether I should now be looking at >> other variables such as a fore-aft saddle positioning, saddle angle, and >> even saddle type (currently a B68, slammed back as far as it can go on a >> S83, with the nose pitched up ~10 degrees or so). Other relevant factors >> might be crank arm length (175mm), pedal height (Pedaling Innovations >> platform pedals), and shoes (Chuck Taylors, typically). Looking for the >> optimum balance of comfort, efficiency, and protecting my perineum. >> >> Jay Lonner >> Bellingham, WA >> >> >> >> >> -- 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/1abf947f-8db1-4d10-bd38-1c3d59677ee0n%40googlegroups.com.
