I’ve used the contact chat to see if bikeinsights has insight into the weirdness. I suspect since the data chart knows the C-T is shorter on the 57, it’s a graphic rendering issue, not a data entry issue. And yes I know tire size doesn’t make a diff if bb’s are aligned — I mentioned that as a ref point in case the rendering engine might be favoring one data point over another.
Since i, and a lot of others here, have used bikeinsights frequently it’d be nice for it to represent the entered dimensions accurately in the illustration, since that is the main selling point of the app. We can dig up and compare data tables but it’s sometimes so much nicer to visualize the differences — and when that isn’t accurate. Anyway, we’ll see — I’ll report back if they respond. On Wed, Aug 21, 2024 at 9:05 AM Bill Lindsay <tapebu...@gmail.com> wrote: > I agree with the subject line that the "smaller" 57 is drawn taller than > the "larger" 58. That is indeed weird. Regarding "another setting" or > somethin you're missing, I think it may be this: the person who > voluntarily submitted/entered the data for the 57cm 2017 Hillborne was > almost certainly a different person than the person who submitted/entered > the data for the 58cm 2022 Hillborne. This is the Wikipedia of bike > measurement data. It is useful as a reference but it isn't perfect. If > you had both bikes on hand and did your own measurements and had equivalent > copies of both full geo-charts I imagine you could figure out the source of > the weirdness. If your sole objective is to improve the quality and > fidelity of BikeInsights as a tool for future users, that would be a noble > pursuit to clear up the weirdness, for this and any/all other cases of > weirdness. > > I guess one small thing you may be missing is that nothing about tire size > is going to do anything to the way the bikes line up when their BB's are > drawn on top of each other. Tires have no impact on where the top tube is > relative to the BB. Still it's weird. Obviously the 57 in reality will > have a top tube 1cm closer to the BB than the top tube is on that 58. > Another small thing is to just remember is that there is no such thing as a > model year for a Hillborne. > > I suspect, though, that your sole objective is not to improve the quality > and fidelity of the free online bike fitting reference BikeInsights. I > suspect your objective is to choose a bike. I suspect it's possible that > you are already unsure and confused, and you were looking to BikeInsights > to become less confused, but because of this weirdness, you are slightly > more confused. That's a normal way to feel about things. Bike choosing > without an extended test ride is intimidating. That said, I think it's > easy to "fit" on sloping TT Rivendells. When I bought my first Rivendell, > which was a 56 Hillborne in 2009, that was a time in which Grant was riding > three different sizes of Hillborne. He was riding the 56 (like me) and the > 52, which was the next size down, AND he was riding a 60. He rode them > all. Towards that, I think those two subject bikes are swappable. I'm > sure I could rock either one. Buy the one you have the best feeling > about. If you are going to love one, you are going to love them both. If > you are going to hate one, you are going to hate them both. If you are > certain you will love one a lot more than the other, buy them both and sell > the one you like less. Best of luck. > > Bill Lindsay > El Cerrito, CA > On Wednesday, August 21, 2024 at 5:10:03 AM UTC-7 Tom wrote: > >> If I compare the subj bikes on bikeinsights >> <https://bikeinsights.com/compare?geometries=5b8578f648f3a30004789b23,638a1581423463001c996235,> >> using >> same tire size (44) and choosing the setting to align bottom brackets, the >> 57 in the resulting comparison illustration has a higher top tube / >> standover than the 58, though the actual data chart shows it knows the C-T >> on the 57 is 10mm shorter. Is there another setting I'm missing? >> >> Tom >> > -- > You received this message because you are subscribed to a topic in the > Google Groups "RBW Owners Bunch" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/rbw-owners-bunch/dJhflYpy23k/unsubscribe > . > To unsubscribe from this group and all its topics, 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/61e9b7ba-235d-4461-8c70-221787e91aecn%40googlegroups.com > <https://groups.google.com/d/msgid/rbw-owners-bunch/61e9b7ba-235d-4461-8c70-221787e91aecn%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. To view this discussion on the web visit https://groups.google.com/d/msgid/rbw-owners-bunch/CAPo8BRm8YFmMbtM%3Djk9MyFDSOz0nO_HwSHbkQ8mNGV9-RZ67fw%40mail.gmail.com.
