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Oct
21
comment Have there been designs of bikes with stepless transmission?
Yes. fallbrooktech.com/cycling/n360
Sep
30
awarded  Explainer
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
24
revised Why is it easier to follow a cyclist up-hill
added 454 characters in body
Aug
21
awarded  Yearling
Aug
13
revised How do I use my power meter file to improve my time up this steep hill climb tt?
added 736 characters in body
Aug
13
answered How do I use my power meter file to improve my time up this steep hill climb tt?
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.
Jul
22
comment What's the lowest safe cadence on a climb?
It's easy to calculate the maximum force at the pedal but it's hard to calculate the "safe" force at the knee since that depends on your knee. A reasonable rule of thumb is that max pedal force is around 12*watts/rpm, and that applies whether riding on the flat, gentle climbs, or brutal climbs. Of course, on brutal climbs you'll need the right gearing to keep your power down -- with your current gearing up a 15% slope your power at 90 rpm wouldn't be 225 watts.
Jul
21
comment What's the lowest safe cadence on a climb?
BTW, from the information given in your question, it appears your max pedal force will be around three-quarters of your body mass (i.e., less than your body mass).
Jul
21
revised What is the optimal cadence?
added 203 characters in body
Jul
21
comment What's the lowest safe cadence on a climb?
Does the section labeled "Cadence and knee strain" in this bicycles.stackexchange answer address your question? bicycles.stackexchange.com/questions/12518/…
Jul
16
awarded  Nice Answer
Jul
13
comment How do I train for climbing in a relatively flat area?
There is insufficient information to give a good answer. Are you trying to race up these climbs, or are you just trying to survive up these climbs? How long and how steep are the most difficult climbs you anticipate doing? Will you be riding with others with whom you're trying to keep up, or can you set your own pace?
Jul
12
comment When Mark Cavendish says he's sprints at 1500 watts how long is that for?
Cavendish was the subject of Menaspa's 2013 article in IJSPP so it is particularly on point for this question.
Jul
11
revised Analysis of Stages high-speed data
linked to Kautz pedaling data showing one torque peak per revolution
Jul
11
reviewed Approve suggested edit on Shifters compatible with: SG-3D55 (Shimano Nexus 3 speed - disk brake - internal gear hub)