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Search: Posts Made By: RChung
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Forum: Road Cycling
11-19-21, 12:35 AM
10-29-21, 12:34 PM
Replies: 38
Views: 1,079
Posted By RChung

Hmmm. No, but I know how one could find out.

Hmmm. No, but I know how one could find out.
10-27-21, 09:54 AM
Replies: 12
Views: 821
Posted By RChung

I split my time between California and Paris, and...

I split my time between California and Paris, and have been doing so for the last 20 years. Over those two decades, I've seen a large increase in bike usage -- and the increase in the last 18 months...
10-27-21, 09:41 AM
Replies: 84
Views: 2,388
Posted By RChung

95% of 20 minute effort doesn't appear to be...

95% of 20 minute effort doesn't appear to be close to 60 minute effort.
Neither does 85% of a 5 minute effort.

...
10-27-21, 03:04 AM
Replies: 84
Views: 2,388
Posted By RChung

Yes.

Yes.
Forum: Road Cycling
10-22-21, 10:03 PM
Replies: 36
Views: 1,034
Posted By RChung

Coincidentally, that plot in post #18 showed...

Coincidentally, that plot in post #18 showed readings from two PMs which, on average, differed by 3-4%. This is why I've been saying that knowing that two devices are close on average isn't that...
Forum: Road Cycling
10-22-21, 07:24 AM
Replies: 20
Views: 553
Posted By RChung

Ah, you may be right. I'm more used to ACP regs,...

Ah, you may be right. I'm more used to ACP regs, that limit aerobar extension length to no farther forward than the brake hoods. I suppose it would be possible to use "long" extensions on a regular...
Forum: Road Cycling
10-22-21, 02:00 AM
Replies: 36
Views: 1,034
Posted By RChung

I care about whether they read in chicken-power...

I care about whether they read in chicken-power because in order to test their accuracy, I measure the difference in reported power when adding a known mass, or climbing a known height, at different...
Forum: Road Cycling
10-22-21, 01:36 AM
Replies: 20
Views: 553
Posted By RChung

Those are "mini" aerobars, designed for road...

Those are "mini" aerobars, designed for road bikes. Most "standard" aerobars are longer but are designed for TT bikes which have a steep seat tube so the rider is more forward, so the extensions are...
Forum: Road Cycling
10-20-21, 01:22 PM
Replies: 36
Views: 1,034
Posted By RChung

There are lots of things you can do with power...

There are lots of things you can do with power meter data. Training is certainly one of them, but there are others. It turns out that training (especially training FTP) is one of the least demanding...
Forum: Road Cycling
10-20-21, 12:24 PM
Replies: 36
Views: 1,034
Posted By RChung

Woah. So, that's exactly what you expected but...

Woah. So, that's exactly what you expected but you still think that the relationships between power and speed aren't going to be affected? Hmmm. You don't do a lot of statistical estimation, it...
Forum: Road Cycling
10-20-21, 01:28 AM
Replies: 36
Views: 1,034
Posted By RChung

That's a good and important question. There...

That's a good and important question.

There are two ways to get faster: more power or less drag. I'm now at a stage of my life where my power is way down from my peak -- but I'm only a tiny bit...
Forum: Road Cycling
10-19-21, 09:11 PM
Replies: 36
Views: 1,034
Posted By RChung

Sigh. People say this all the time too, but those...

Sigh. People say this all the time too, but those people have never actually tried to use their power meters to do anything where the relationship between power and speed varies. Are you familiar...
Forum: Road Cycling
10-18-21, 10:59 PM
Replies: 36
Views: 1,034
Posted By RChung

People say this all the time, too, and you can...

People say this all the time, too, and you can pretty much tell who doesn't use power data to their fullest extent when they say this. You know what's consistent? A wristwatch. If all you needed is...
Forum: Road Cycling
10-18-21, 09:03 AM
Replies: 36
Views: 1,034
Posted By RChung

People say this all the time but, unless you're...

People say this all the time but, unless you're doing something that's a lot more important than riding a bike, you really don't need much more precision and accuracy than you can easily to achieve...
Forum: Road Cycling
10-18-21, 04:26 AM
Replies: 36
Views: 1,034
Posted By RChung

If you have only the Garmin 830, you'll have to...

If you have only the Garmin 830, you'll have to use a phone to record the other with BT while using the 830 to record ANT+. Syncing up the data streams by time stamp alone is a pain; the easiest way...
10-01-21, 08:22 AM
Replies: 155
Views: 4,328
Posted By RChung

Yup. There's a negative relationship between...

Yup. There's a negative relationship between cadence and gradient, so as the road got steeper cadence dropped and crank torque increased. Because I have speed and cadence, we can also calculate gear...
09-30-21, 11:55 PM
Replies: 155
Views: 4,328
Posted By RChung

There are two ANT+ standards used by power...

There are two ANT+ standards used by power meters: the PWR standard transmits power and cadence. The CTQ standard transmits crank torque and cadence. With the CTQ standard, the head unit knows the...
09-30-21, 01:05 AM
Replies: 155
Views: 4,328
Posted By RChung

He's read the full article. Go to the link and...

He's read the full article. Go to the link and download the article yourself. In particular, he's referring to figures 6 and 7, and the bottom paragraph on page 104 that continues to the top of page...
09-29-21, 12:26 AM
Replies: 200
Views: 4,762
Posted By RChung

Oh, I concur -- I simply meant that it's closer...

Oh, I concur -- I simply meant that it's closer than the amount of work involved in running a mile in 7 or 8 minutes vs. riding a bike at 20 mph for an hour. For a person of 75 kg, running a mile at...
09-27-21, 11:58 PM
Replies: 200
Views: 4,762
Posted By RChung

Your rule is that running one mile in 7 or 8...

Your rule is that running one mile in 7 or 8 minutes is equivalent to riding 20 miles in 60 minutes? I think that's more than "possibly" incorrect. OTOH, running at a pace of 7 or 8 minutes/mile is...
09-27-21, 12:17 PM
Replies: 200
Views: 4,762
Posted By RChung

That fits nicely into my rule of "between 2.5 and...

That fits nicely into my rule of "between 2.5 and 3.5" described above.
09-27-21, 12:51 AM
Replies: 200
Views: 4,762
Posted By RChung

Probably closer to between 2.5 and 3.5...

Probably closer to between 2.5 and 3.5 (https://bicycles.stackexchange.com/questions/9764/how-many-miles-of-riding-require-the-same-effort-as-one-mile-of-running/9876#9876); the faster you run, the...
09-19-21, 12:14 AM
Replies: 91
Views: 2,653
Posted By RChung

Gravitational constant varies a bit more than...

Gravitational constant varies a bit more than 0.5% over the surface of the Earth. It's lower at the Equator and higher at the poles.
09-05-21, 08:42 AM
Replies: 207
Views: 5,874
Posted By RChung

Ride nekkid and see how far you get. Whether...

Ride nekkid and see how far you get. Whether that's significant depends on whether you do this in front of a furry convention.
08-29-21, 12:22 AM
Replies: 8
Views: 586
Posted By RChung

Garmin Connect IQ apps that are worth it?

What apps have you found to be useful?
Forum: Road Cycling
08-27-21, 10:53 AM
Replies: 42
Views: 1,994
Posted By RChung

The #1 rule of buying a power meter is: unless...

The #1 rule of buying a power meter is: unless you have a really really good reason, avoid low serial numbers.

Rule #1B: never predicate a purchasing decision on an as-yet unreleased product. They...
Forum: Road Cycling
08-27-21, 07:29 AM
Replies: 132
Views: 8,630
Posted By RChung

What are some of your preferred ConnectIQ apps?

What are some of your preferred ConnectIQ apps?
Forum: Road Cycling
08-27-21, 03:40 AM
Replies: 8
Views: 513
Posted By RChung

The Rallys are more expensive but either will...

The Rallys are more expensive but either will probably be okay.

Here's what I tell everyone once they get their very first power meter:

Just ride normally for a couple of weeks on your usual...
08-26-21, 07:12 AM
Replies: 31
Views: 877
Posted By RChung

Yes, but it's complicated unless you're going...

Yes, but it's complicated unless you're going slowly enough not to worry about aerodynamic drag. If you're going slowly, things are much simpler: each foot of climbing is roughly equivalent to 1/Crr...
Forum: Road Cycling
08-23-21, 02:29 AM
Replies: 58
Views: 3,248
Posted By RChung

Ashton Lambie just became the first rider to go...

Ashton Lambie just became the first rider to go under 4 minutes for 4K at 3:59.93. That is, he went 4K with 0.07 seconds to spare. At his speed, that was a bit more than 1 meter, or less than the...
08-23-21, 02:14 AM
Replies: 8
Views: 626
Posted By RChung

Not an engineer, definitely not a genius, but...

Not an engineer, definitely not a genius, but it's true I've spent some time thinking about this stuff. For the OP, the more important thing is that I have a limited budget to spend on cycling so I'm...
08-22-21, 12:02 PM
Replies: 8
Views: 626
Posted By RChung

Five or six year old aero bike, plus a good new...

Five or six year old aero bike, plus a good new aero helmet, plus a good quality used power meter (not single-sided) that you'll use to tune your aero and rolling drag. That will be a better use of...
08-20-21, 09:09 AM
Replies: 8
Views: 590
Posted By RChung

This is going to depend on how detailed the...

This is going to depend on how detailed the underlying map is, not so much the app itself. If the map doesn't know about bike lanes, the app can't either.
08-17-21, 01:45 PM
Replies: 34
Views: 1,073
Posted By RChung

You can often find vendors at the airport who...

You can often find vendors at the airport who will wrap boxes with heavy duty plastic wrap for $10-15 per box. If I had to change flights, I might do that.
08-17-21, 06:04 AM
Replies: 34
Views: 1,073
Posted By RChung

Depends on whether you can fly non-stop or if you...

Depends on whether you can fly non-stop or if you have to have your luggage change planes.

I've only ever flown non-stop, on United or Air France, and always used cardboard boxes with the bike...
08-12-21, 01:15 PM
Replies: 26
Views: 1,098
Posted By RChung

Freely chosen cadence appears to respond to...

Freely chosen cadence appears to respond to changes in CIL. This by the way is why you generally can't take your "freely chosen" cadence on an indoor trainer at a given power level and transfer it to...
08-12-21, 01:23 AM
Replies: 26
Views: 1,098
Posted By RChung

I believe Jim Martin and his students at Utah...

I believe Jim Martin and his students at Utah have done some work on muscle activation during the pedal stroke. I know they've done studies on crank length, cadence, and elliptical vs. round rings,...
08-03-21, 03:50 AM
Replies: 57
Views: 2,310
Posted By RChung

I stopped reading there.

I stopped reading there.
08-01-21, 08:48 AM
Replies: 57
Views: 2,310
Posted By RChung

For a decrease in ambient temperature of 1 deg....

For a decrease in ambient temperature of 1 deg. C., rho will typically increase by ~0.4% to 0.5%; it depends on the tire but typically we'll see Crr increase by maybe 1.2% to 1.5%. So we know the...
Forum: Road Cycling
08-01-21, 02:15 AM
Replies: 16
Views: 1,001
Posted By RChung

Modern Flip-Flop hubs are fixed gear on one side...

Modern Flip-Flop hubs are fixed gear on one side and ratcheting on the other, but they're the same number of teeth so you don't have to change the length of the chain. To change the gear those riders...
07-31-21, 01:16 AM
Replies: 57
Views: 2,310
Posted By RChung

I must speak with different racers than you.

I must speak with different racers than you.
07-28-21, 01:09 AM
Replies: 78
Views: 2,224
Posted By RChung

The sum of an infinite series can be finite. ...

The sum of an infinite series can be finite.

But more practically, surely the "bendiness" or scale of relevance is a bicycle wheel on the surface of a road. If you believe you can measure the...
07-27-21, 04:13 PM
Replies: 78
Views: 2,224
Posted By RChung

The problem is a lot easier to think about if...

The problem is a lot easier to think about if there *is* a right height -- then the right estimation methods are the ones that include/exclude changes/differences so that you end up with the right...
07-27-21, 09:16 AM
Replies: 78
Views: 2,224
Posted By RChung

I was responding to the claim that there is no...

I was responding to the claim that there is no "right" height. I demurred: there is a right height, and one can compare various measurements or estimates of that height to the actual "right" height....
07-27-21, 08:37 AM
Replies: 78
Views: 2,224
Posted By RChung

The work it takes to raise a mass m up a height h...

The work it takes to raise a mass m up a height h under the force of gravity g is m*g*h. So that's what I do: rather than measure barometric pressure or GPS elevation gain or worry about resolution,...
07-27-21, 01:31 AM
Replies: 78
Views: 2,224
Posted By RChung

Shorter: "Robert is an annoying pedant." Hmmm....

Shorter: "Robert is an annoying pedant." Hmmm. Guilty as charged.
07-27-21, 12:59 AM
Replies: 78
Views: 2,224
Posted By RChung

The accumulated elevation gain between two points...

The accumulated elevation gain between two points must *not* be path dependent, or else you could go up the climb the "short" path and down the "long" path and gain more energy going down than you...
07-26-21, 06:26 PM
Replies: 78
Views: 2,224
Posted By RChung

That's a different problem. Are you saying that...

That's a different problem. Are you saying that if I hold my hand above a table top, there is no "right" distance between my hand and the table top? You can't measure a distance between two points...
07-26-21, 01:58 PM
Replies: 78
Views: 2,224
Posted By RChung

My apologies. I once got a student course...

My apologies. I once got a student course evaluation with: "You lied when you said we wouldn't need calculus for the class." So I didn't stop using calculus, but I did stop saying they didn't need it.
Showing results 1 to 50 of 1000
 


 
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