Reputation
5,623
Top tag
Next privilege 10,000 Rep.
Access moderator tools
Badges
1 19 31
Newest
 Good Answer
Impact
~187k people reached

1d
comment Is there a standard equivalent for effort between distance and elevation?
It's complicated but not terribly so if you know power and speed. That's the basis for the "virtual elevation" approach for estimating cycling drag -- it converts effort (in terms of power and speed) into elevation gain.
1d
comment Is there a standard equivalent for effort between distance and elevation?
Sure there's a way to convert % climb into level miles. All you need to know are a handful of things: your total all-up mass (including you, your bike, and all your equipment), your coefficient of rolling resistance, your coefficient of aerodynamic drag, the wind speed, and your ground speed.
1d
comment Is there a standard equivalent for effort between distance and elevation?
@DanielRHicks If you use a power meter you can estimate "fatigue profiles" that show how power decreases with duration of effort. People who have done so have shown individual consistency under wide (but not extreme) ranges of pedal force and pedal speed conditions. That is, your fatigue profile may differ from mine, and each can change with fitness and training, but otherwise, yes, there is some science to calculating fatigue and recovery rates.
2d
comment Is there a standard equivalent for effort between distance and elevation?
A third option is to track "session RPE" using the 10-point (or 20-point) Borg scale, which doesn't require any hardware investment at all -- and, once you know how to use it and get some experience, is roughly about as accurate as looking at average heart rate.
Jun
21
comment Knee position while on the aero bar
It's hard to tell from these photos so take these as comments and questions rather than an answer -- but it seems like that frame may be a bit big for you. Putting aero bars on a road bike isn't ideal -- if you're doing draft-legal you may want to investigate ITU-legal mini-aero bars. Where is the tip of the saddle in comparison to the BB? I'm not a big fan of KOPS or related fitting systems but if you are, then when you drop a plumb line the bike has to be horizontal, and it appears that your bike is being held in the rear on a trainer but the front wheel is on the floor.
Jun
10
comment Why exactly did Boardman manage a further distance than Wiggins?
It's actually not that uncomfortable -- I've experimented with it. That said, it's definitely harder to control the bike so I wouldn't recommend it unless you were on a straight flat road or a velodrome. Alone.
May
21
comment What is a power meter and why do I need one?
@ChrisCleeland I sort of disagree. I've never been much of an athlete on a bike and a power meter has helped me quite a bit. I got one before I had a TT bike, and this answer, while good in general, mostly addresses the idea that a power meter is only good for training FTP. Power meters can also be used for other things than training FTP -- in fact, training is one of the least demanding things one can do with a power meter.
May
5
comment what power did alex dowsett put out during his hour record?
The rider is allowed to receive very limited information, according to UCI rules: pace, distance covered, or time. If the velodrome is quiet you can shout out lap times but generally for record attempts you use a chalkboard -- though of course more recently teams have been using iPads or other tablets. You don't want to give the rider too much distracting information.
May
5
comment what power did alex dowsett put out during his hour record?
A power meter was mounted on the bicycle but according to UCI rules no visible display is allowed so the data are either for review post-ride or can be transmitted to a track side computer for real-time analysis.
Apr
5
comment How many miles of riding require the same effort as one mile of running?
@StephenTouset, I've done a similar thing for short duathlons, where you have a bike leg in-between two run legs. Here's an example of the splits: anonymous.coward.free.fr/wattage/duath-splits.png
Jan
9
comment How can we calculate the efficiency of the Siva Cycle Atom generator?
Crr scales exactly like slope, so an increase in slope of 0.3% is exactly like saying the Crr increases by .003. Regular road tires (not knobbies) typically have a Crr in the range of perhaps .004 to .008 on smooth roads, so using the Siva would feel like switching from low rolling resistance racing tires to Continental Gatorskins (or from Gatorskins to heavy-duty belted hybrid tires).
Dec
22
comment What is neuromuscular endurance in the world of bicycling?
If you're interested in this question because of its relationship to cadence, perhaps you will want to read this: bicycles.stackexchange.com/questions/12518/…
Nov
23
comment Why am I not seeing improvement in my bike split time?
There isn't enough information in your question to provide a good answer. How did you place on the various legs this year compared to last year? Is the bike leg mostly flat or quite hilly? Except for the aerobars did you use the same bike, same tires/tubes, and same clothing/helmet? Going into T2, where you about as tired both years, or did you feel you had more in the tank starting the run? Overall time improved by 36 minutes, most of which was in running. Did better pacing on the bike improve the run? All of these can affect the SBR splits.
Oct
26
comment will increasing cadence ability hurt my climbing strength?
You may want to read this related bicycles.stackexchange question and its answers: bicycles.stackexchange.com/questions/12518/…
Oct
21
comment Have there been designs of bikes with stepless transmission?
Yes. fallbrooktech.com/cycling/n360
Aug
30
comment Accurately replicating the resistance felt whilst riding via a resistance fan diy turbo trainer
@DanielRHicks, Alex is familiar with the inertial load. Here is his home-built resistance trainer and its flywheel. User95786, here are some estimates of the drag parameters (the "virtual" CdA and Crr) for the Lemond Revolution. Perhaps that will help you in building your own.
Aug
11
comment How do I use my power meter file to improve my time up this steep hill climb tt?
In general, constant power output gives you the best times when the conditions (slope and wind, mostly) are constant. So pacing is an obvious place to look, but that depends on having a power meter that is accurate (not just consistent) over a wide range of pedal force and pedal speed. So it might be important to check your PM before relying on it to pace or to isolate gearing choices.
Aug
11
comment How do I use my power meter file to improve my time up this steep hill climb tt?
And, btw, there is a way to calculate the gear ratios you used -- but not necessarily the gear ratios you should have used. That's an entirely different question.
Aug
11
comment How do I use my power meter file to improve my time up this steep hill climb tt?
I'm sorta surprised you could hit 500 watts near the end of this TT since you did the first 3 minutes at ~370ish. So, you may be able to improve your time with better pacing. However, you'll also want to be sure your PM is working properly. From your other question it appears this is from a Stages, right?
Jul
22
comment What's the lowest safe cadence on a climb?
@DanielRHicks: you're right that max pedal force isn't constant across all cyclists but the classic dataset collected by Kautz (isbweb.org/data/kautz, or anonymous.coward.free.fr/rbr/kautz.png) shows that max pedal force is roughly twice avg. pedal force (in the Kautz data, max is 1.85x avg), whence the rule of thumb cited above. This has been verified by more recent pedal-based power meters like the Garmin Vector.