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Snfoilhat Added a comment about feature Shorter Cranks - Are They for You?
12/17/2024 3:03pm
You say that like vital “finding” the same thing as some previous vlogger or outside content creator are two independent data points! When the likelier explanation is having copied from it. Oh sorry, having taken inspiration from it. Personal testimonies from bike technology cosplayers aren’t independent sources of evidence that can be taken to support one another. Well heck, if we all agree and meet up here to tell everyone what we agree on how can we be wrong!??
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This feature has 37 comments.
Snfoilhat Added a comment about feature Shorter Cranks - Are They for You?
12/17/2024 2:43pm
Velo, sick, thank you. It’s almost like road and mountain are different contexts and conclusions drawn in one won’t necessarily apply to the other.
This feature has 37 comments.
Snfoilhat Added a comment about feature Shorter Cranks - Are They for You?
12/17/2024 7:50am
I did a literature search on this topic when pb ran an article like this a few months ago. I’ve read the papers. Why on earth say there is a lot of research and then not mention the research? It’s a flex to imply the writer has done their homework and imply that their conclusions fit with what other researchers have found. Except what y’all wrote doesn’t agree with it, and it’s not clear any of y’all actually read it. Vital’s reviews stand up on their own. You don’t need to write this lab coat poser stuff. Who are you...
This feature has 37 comments.
Snfoilhat Added a comment about feature Shorter Cranks - Are They for You?
12/16/2024 7:51am
One possible improvement to the article would be to add citations where you say stuff like “There has been a lot of research into crank length…” Another would be to then admit that these primary sources are mostly from cycling contexts other than mountain biking, and so generalizing from road to mtb requires caution. Another option is to avoid the issue by not doing pinkbike style pseudoscience that claims to explain everything in mtb in authoritative style. Exploring questions well is worth way more than giving chatgpt answers with an equation copied out of your old physics textbook.
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This feature has 37 comments.
FDF Bike Shop Liked a bike check Commencal Clash 24 Custom
12/10/2024 7:32am
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Snfoilhat Added a reply to The Risk of Riding Mountain Bikes
11/29/2024 3:57pm My earlier comment strikes me as too circular and I want another shot at saying things more clearly. Here's why I think you can't make inferences from the demographics of the study population even when they did collect the data (e.g. sex), not just when they didn't collect it (e.g. skill level). Every inference that can be supported by the...
Snfoilhat Added a reply to The Risk of Riding Mountain Bikes
11/27/2024 3:29pm There are no comparisons* in the academic article for a perfectly sound reason: the sample is too small and too special. The comparison made by the newspaper article, the very recent past vs a span of years preceding it, only gives a tentative sign that the rate of spinal injury is higher than it used to be. Y’all raise good...
Snfoilhat Added a reply to MTB Tech Rumors and Innovation
11/25/2024 12:05pm If lower rider-bike-system COG mattered, riders could bend their knees a few degrees more and achieve lower COG than a new gadget offers. So much about mountain biking, beyond seated spinning on a regular surface, includes dynamically increasing and decreasing your ‘weight’ on the touch points. I’m hoping someone offers some evidence that this static COG picture of bike performance...
Snfoilhat Added a comment about feature Mountain Biking's New Competition - The Evolution of Hard MTB League
11/20/2024 10:48am
I love the idea of a race organization that leaves tracks and opportunities in its wake instead of bulldozing it flat. Change isn’t easy. “Take only photos, leave only tear-offs and energy drink cans.”
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Snfoilhat Added a reply to MTB Frame Compliance Analysis & Discussion
11/15/2024 7:42am So there’s evidence people have been looking at, thinking about, measuring and comparing bike component compliance for years. And there’s evidence that some component and system (for example, a wheel) makers have been doing the same. But instead of helping to create basic language and tools riders could use to compare compliance as one more factor to consider alongside all...
TheKaiser Liked a reply to forum topic MTB Frame Compliance Analysis & Discussion
11/15/2024 7:04am
Henry at PB, and many others, including very good friends of mine who are bike mechanics/wheelbuilders, all seem to think that increasing spoke tension will increase the stiffness of a wheel, and vice versa. They all rely on some sort of "feel" related justification, and post hoc rationalization of why they think the tension is leading to what they think they are feeling. I am still unconvinced. I am not sure if you have ever seen it, but Damon Rinard (who has been a lead engineer at many bike companies) designed a rig back in the 90s to test the...
This forum topic has 135 replies.
Snfoilhat Added a reply to MTB Frame Compliance Analysis & Discussion
11/13/2024 8:55am There is a wheel review on a prominent mtb website where the reviewer attempts to educate the reader about why different wheels have different compliance. He uses the example that a 2X laced wheel, a 3X laced wheel, and a 3X laced wheel detensioned a small amount will all have different compliance. The rationale offered is theoretical and to put...
Snfoilhat Added a reply to 140 laps A/B test data -- considerations for future mtb data projects for readers and test riders
11/11/2024 8:56pm Conclusions and considerations for future mtb data projects for readers and test riders (as promised at the top) Say you want to jump on the trend of more data in your mtb content or more empirical testing. Say you are sample size ≥ 2 curious. How many test runs do you do and how do you deal with and talk...
Ryan Burney Liked a forum topic MTB Frame Compliance Analysis & Discussion
11/11/2024 10:04am
Hey, I’m Ryan Burney. I’ve spent eight years as an engineer for full-suspension bikes, working on some fun projects, like developing the flex Horst link for the Cannondale Scalpel and being lead engineer for the latest GT Fury downhill bike. With over a decade of downhill racing under my belt (even made it to one World Cup—though I didn’t qualify so I stuck to engineering), I've had the pleasure of racing alongside the Vital crew, like Jason, Tanner, and Dak. Below is a photo of me, being slower than Dak. These days, I’m focused on my own projects, but I...
This forum topic has 135 replies.
Snfoilhat Added a reply to 140 laps A/B test data -- considerations for future mtb data projects for readers and test riders
11/11/2024 9:19am Analysis I chose this online tool because it is freely available and because of the emphasis it puts on the assumptions of each test. Statistical test results are so much science-flavored nonsense when the assumptions aren't discussed with all the receipts ready to be shown. * This is why when one time in a session got flagged, all six times...
Snfoilhat Added a reply to 140 laps A/B test data -- considerations for future mtb data projects for readers and test riders
11/10/2024 6:47pm Data (Comma Separated Values). Copy-paste into a text file and save as .csv. Open .csv in any spreadsheet or stats application. It may be that your preferred application will allow you to copy-paste directly and it may not. @Con Rad-ish Date,Order,Bike Setup A,A Flagged,Bike Setup B,B Flagged 7 Jan 2024,first,44.883,N,, 7 Jan 2024,second,45.213,N,, 7 Jan 2024,third,45.405,N,, 27 Jan 2024,first,44.774,N,47.631,N 27...
Snfoilhat Added a reply to 140 laps A/B test data -- considerations for future mtb data projects for readers and test riders
11/7/2024 5:47pm I think I get what you're saying and I hope you'll correct me if I'm wrong. And I think you see what I'm doing with this thread, but if that's that case then I don't know that I'm totally getting what (I mean why) you're saying it :D This data set is a dog's breakfast. OMG 140 laps. It's going...
notanengineer Liked a reply to forum topic 140 laps A/B test data -- considerations for future mtb data projects for readers and test riders
11/7/2024 3:52pm
Came to share a similar sentiment, but your comment is very kindly worded. Sometimes, when we have a hammer, everything begins to look like a nail. For those interested, I would suggest perusing a text like ‘design and analysis of experiments’ by Montgomery or similiar text. The first chapter of Montgomery’s book further discusses some of the experimental concepts brought up by PointOne and may steer you to a more appropriate experimental design as well as deeper thought about measurement.
This forum topic has 20 replies.
sspomer Liked a reply to forum topic 140 laps A/B test data -- considerations for future mtb data projects for readers and test riders
11/6/2024 8:04am
this is awesome!
This forum topic has 20 replies.
TEAMROBOT Liked a reply to forum topic 140 laps A/B test data -- considerations for future mtb data projects for readers and test riders
11/6/2024 8:03am
This is wild! That's a lot of practice on the same trail. Betting you have every rock, bump, and line burned in your memory now. If I'm eyeballing lines of best fit for A and B for the graph you shared, it seems like A starts out slower than B, then they converge to be equivalent by the end of June through the end of the test in November. At the widest point of variance between A and B, it's about 3 seconds (46-ish seconds per lap for A vs. 49 seconds for B, eyeballing lines of best fit). Which...
This forum topic has 20 replies.
