Solving cycling mysteries one spreadsheet at a time! Cycling science thru evidence not dogma including: aero savings, rolling resistance, power curves, turbo training, pacing, timetrials, power based training, FTP testing, exercise physiology. Occassionally we will try and bust a cycling myth. This is an independent channel not taking sponsorship and hence views are those of FFT only. Have a great ride!
I got an 87 Cannondale SM600 with Biopace. I thought it was cool but then didnt see them installed on bikes later on. But once I took some pics of the bike for a Cannondale forum, people mentioned them. Came here and got totally confused. But one thing I wasnt confused on is why he used all white background and heavy lighting to show off the design by not allowing us to see it.
The odds are you're not riding on perfect tarmac. A 32 tire is significantly better on average tarmac, reducing imperfections and vibrations which can in turn improve your inertial retention.
I don’t get it. The title of the video is how many watts lots by an old chain but the analysis was all about chain wear. I was expecting something like under 250 watts a chain that has ridden about 10K kn will have a loss of 5 watts - or something like that related to the video title.
To be an effective communicator, you would be advised to label the axes of every graph you draw. It takes a few seconds, but it is gold for those who are new to the metrics you are discussing.
Your reasoning is only based on the contact surface size and shape. But an elastomer is not a pure spring, otherwise no energy would be lost during a cycle (let say a round of the wheel). It is also a damper from a microscopic point of view. So a true comparison would be based on the amount of energy loss in the rubber over a cycle. The quicker and larger is the tyre rubber deflexion (measured in J/m3), the greater is the loss. We can't conclure anything in favour on the best tire rolling resistance since it has to be evaluated by calculations (FEM) or measurements, but your reasoning isn't based on the a correct analysis of the microscopic phenomenons in place
Thank you for this great video. I was wondering whether I misunderstood from Stephen Seilers videos that he does not consider TIZ as the basis for polarization, but rather the number of session. I believe he mentions in that video that this is a widespread misconception, but I might have misinterpreted that. Any comment ?
The elepant in the room, much higher cost snd much hevier tiers!!😂 look at motor bikes, for example, thiner front and wider back. Phisics is not different for bikes, lol. People are sheep! Biiin
This debate is endlessly frustrating for normal people that just want to improve their heart and cardiovascular health. I keep finding more studies showing superior cardiac improvements from >90% HIIT versus 70% steady state. Heart chamber dilation (left ventricular eccentric hypertrophy) is frequently given as the main argument for Zone 2 saying that supposedly the heart chambers cannot fill entirely above Zone 2. But many HIIT studies mention even chamber size as increasing more from HIIT. What intensity distribution do you recommend for optimally increasing heart chamber size and stroke volume? Why do you think the latest HIIT studies show superior results even for LV eccentric hypertrophy?
Started running again 5 months ago @60 yo. Had a PB in a race this week of 21 mins (according to Strava it was even 20:44 😅), which was about 30 secs off of my time a month earlier. Still progressing and hoping to dive under 20 mins one time.
I started running 2 months ago from a 32mins 5k, my current pb is 24:12. I'll update my progress overtime by editing my comment. *Update 1*, end of September : currently weighing 105kg (6ft4 / 193cm) Kept running, usually around 50km a week. 3 easy 10k, 1 easy 20k. Ran a 23:26 a week ago. I'll keep the same program except I'll add some speed work on the treadmill, I'd like to increase my weekly volume to around 60km.
I optimized my exposed exterior routed cable routing so they all are "in line" with the steerer tube, not sticking out to the sides. If it saves me a few thousand dollars and a watt or 2.
A bike is a system. Disc brakes made ridiculously stiff frames and forks necessary, which leads the people to seek at least some amortisation in wider tires. That's all that is to that. And it all adds weight.
VERY-best video, great story-telling and all! thank you! sub'd/lkd A QUESTION...what would HAND-PRESSURE vary, with each Cycling Position? I wonder??? Its NOT just about the rear-end, right? :-)))
2 месяца назад
With this video you lost all the credit, wrong name on the units, concepts that are obviously absurd got me to unsubscribe the chanel.
Ive got a question regarding the polarized training method. Following the 80-20. For a person that has 6 hours a week thats 72 minutes of vo2 max, done in 2 days thats 36 mins of time in zone. For a person with 12 hours available is it double? 18 hour triple? I find it too much work to fit in a week
Trek didnt spend any r&d money on it. They paid lynskey (the owner of Litespeed) to make a narrow bottom bracket titanium litespeed and painted it like a trek.
I thought this would be some sort of scientific explanation. But actually this video is far from this and only about his personal (miss)understanding of physics and how (he -thinks-) the bicycle industry wants to trick us. Short advice: read the full article before making videos like this. The comments that you get are not about hating but rather about your lack of knowledge about physics and your laziness to not completely read an abstract.
7:38 -- Again, zone 2 is too high for us mortals ... All that BS above #2 are just a bumble of numbers that *cannot* be separated on any training run unless you have yrs of running.. I've banning this guy from my search results ... It is *obvious* he has only run across the street as his training..
Alex I have a question . I have knobbies tires on my 26inch wheel mountain bike . The knobbies are 12 mm in length and width and 10 mm apart . When I'm riding on the road I add more pressure to the tires so only the center most section is touching the road . When me and my road bike riding friend start off on a black top hill and neither one of us touch the pedals I can get to the bottom of the hill faster than his racing road bike with the skinny road tires . My bike weights more and I weigh more . Is it the weight that makes me go faster down hill or is it because I only have 106 12 mm patches of rubber touching the road in one full rotation ? Would you do a knobbie tire test vs a solid rubber tire .
One more thing... What makes you think the amount of 'drop' determines comfort? It's an incorrect assumption, and absolutely does not. Pressure determines comfort over a given surface, but pressure is not constant. A large volume will have smaller pressure variation, so will be more comfortable because the pressure in a smaller tire spikes progressively as bump sizes increase. Sorry, but you misunderstood nearly everything about rolling resistance, except the fact that for given pressure and weight give nearly identical contact patch area, unfortunately the rest is completely incorrect conclusions. If it was my video I'd take it down and redo it with correct information.
It’s a cheat if you compete. Otherwise, it’s an assist. A hundred miles in a day used to be easy for me. Now, in my seventh decade on this planet, after a major organ surgery and multiple crashes over the years have taken a toll on my back, 30 miles is more the norm. I can still do a century, but it wipes me out for a couple days afterward. An assist on the tougher uphills, and into serious headwinds? That would be welcome.
I recently put some old 53/39 biopace chainrings on my TT bike and rotated the chainrings 72 degrees (one hole) counterclockwise. It seems to be working for me. I'm going to run this configuration for a couple of weeks and see how it affects my Wednesday Night Time Trial Series times.
Ceramic and hybrid ceramic bearings definitely save a considerable amount of energy, but how much depends on the OEM bearing seal type, ball grade, ABEC precision level, ceramic ball type, race material, and type of lubricant. I even have data that shows a tungsten disulfide coating applied to bearing races will save up to 5w. I sell hybrid ceramic bearings for ebikes that improve the range up to 20-25% with the full kit and a *lot* of data to back it up 🙂
Shorter is better for ultra distance. Much less pain in knees and hips for zero cost in speed. I am moving to 150 cranks from 165s to further optimize. If I was riding normal distances I probably would not think much about it.
Playing with that calculator made me understand why and how I got overtrained in the past 2 weeks. Somehow, it never occured to me that I should not do long rides at near FTP power. It's so simple but so easy to miss! Bless you! PS: it would be nice to have an elevation gain parameter that estimates the extra energy needed on the ride.
