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Search: Posts Made By: RChung
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01-27-23, 02:56 PM
Replies: 11
Views: 373
Posted By RChung

I can understand that, but the intent of the...

I can understand that, but the intent of the proposed rebate is to generate purchases from a broader population that may not currently be interested in e-bikes rather than from those who already are.
01-26-23, 06:47 PM
Replies: 11
Views: 373
Posted By RChung

For 2023 the Federal Poverty Level is $9440 +...

For 2023 the Federal Poverty Level is $9440 + (number of people in household)*5140.

If there are 3 people in the household, the 2023 FPL is 9440 + 3*5140 = 24860. The CARB is proposing that the...
01-26-23, 01:02 PM
Replies: 155
Views: 3,893
Posted By RChung

Been there, done that. It used to be common for...

Been there, done that. It used to be common for pro riders to post their power data both from races and from training but it's less so today. Fortunately, I have some data files from some pro riders...
01-24-23, 05:22 PM
Replies: 155
Views: 3,893
Posted By RChung

Here's a plot of a rider doing a hillclimb on a...

Here's a plot of a rider doing a hillclimb on a multi-geared bike. The top left panel shows the relationship between cadence and power, the top right shows the relationship between crank torque and...
01-24-23, 09:50 AM
Replies: 155
Views: 3,893
Posted By RChung

I think Ganna used taller gearing than many...

I think Ganna used taller gearing than many others would be able to. But I also think there are aero drag reasons both to use shorter cranks and taller gearing (which decreases pedal speed even...
01-23-23, 08:07 PM
Replies: 155
Views: 3,893
Posted By RChung

Good idea. I could've assigned him some of my...

Good idea. I could've assigned him some of my homework problem sets. And then graded harshly.
01-23-23, 06:57 PM
Replies: 155
Views: 3,893
Posted By RChung

I have, and do; though I admit the difference is...

I have, and do; though I admit the difference is small. Power is what makes me go faster and sometimes in order to put out more power I shift up and increase pedal force. I've shared the following...
01-23-23, 03:27 PM
Replies: 155
Views: 3,893
Posted By RChung

"Detrimental" depends on what you're trying to...

"Detrimental" depends on what you're trying to maximize. The simplest case is if you're trying to maximize power: in that case, most of us attain max power in the neighborhood of half of maximum...
01-22-23, 03:39 PM
Replies: 155
Views: 3,893
Posted By RChung

I'm not sure it's the most common incorrect form,...

I'm not sure it's the most common incorrect form, but nonetheless it is incorrect. That you got this basic equation wrong did not bode well for the rest of your post but I read it anyway. Then I...
01-22-23, 01:28 PM
Replies: 155
Views: 3,893
Posted By RChung

That's not force.

That's not force.
01-21-23, 08:33 PM
Replies: 66
Views: 1,749
Posted By RChung

I used to do that. Seven years ago I woke in an...

I used to do that. Seven years ago I woke in an ambulance on the way to the ER with broken bones in my face and a partially flattened helmet, plus various other incidental injuries. I couldn't...
01-17-23, 09:58 AM
Replies: 155
Views: 3,893
Posted By RChung

You tried something different and you liked it....

You tried something different and you liked it. Congratulations. That's a good outcome.

That said, if everyone were pedaling at roughly the same cadence, power differences will mostly be...
Forum: Road Cycling
12-11-22, 11:20 AM
Replies: 90
Views: 3,150
Posted By RChung

Sorry. I'll try to do better.

Sorry. I'll try to do better.
Forum: Road Cycling
12-10-22, 11:03 AM
Replies: 90
Views: 3,150
Posted By RChung

So, I'm not sure I want to get into "easily" vs...

So, I'm not sure I want to get into "easily" vs "hard" but this goes back to the assessment of power meter accuracy: if you have the full data file, you can often tell whether there's an error in...
Forum: Road Cycling
12-10-22, 10:29 AM
Replies: 90
Views: 3,150
Posted By RChung

Depends. Sometimes you can tell even with a small...

Depends. Sometimes you can tell even with a small power inflation. However, the smaller the inflation, the more trouble it is so you typically don't want to spend that effort unless the stakes are...
Forum: Road Cycling
12-08-22, 11:39 AM
Replies: 50
Views: 1,890
Posted By RChung

[/b] Nice. Yes, I've been looking at actual...

[/b]
Nice. Yes, I've been looking at actual power, cadence, and torque data for a pretty long time. Most riders' self-reports of what they think they're doing are only a snapshot.
Forum: Road Cycling
11-29-22, 04:58 PM
Replies: 93
Views: 3,620
Posted By RChung

I think your post can be classified under #1 and...

I think your post can be classified under #1 and #3; possibly also #5.
11-19-22, 09:16 AM
Replies: 86
Views: 5,052
Posted By RChung

"The Hague" is what it's called in English. In...

"The Hague" is what it's called in English. In the Netherlands, it's "Den Haag." I'd say it's the English who've done the misspelling.
Forum: Road Cycling
11-16-22, 10:23 AM
Replies: 51
Views: 3,059
Posted By RChung

Shocking, and not. They had exceptional content...

Shocking, and not. They had exceptional content and a unique perspective that convinced me to join and support.
Forum: Road Cycling
11-14-22, 10:45 AM
Replies: 79
Views: 2,400
Posted By RChung

Where, when, and in what language did he say that?

Where, when, and in what language did he say that?
Forum: Road Cycling
11-10-22, 03:44 PM
Replies: 79
Views: 2,400
Posted By RChung

Lie down until the feeling goes away.

Lie down until the feeling goes away.
10-27-22, 01:40 PM
Replies: 201
Views: 5,329
Posted By RChung

Well, we can already measure mass, power output,...

Well, we can already measure mass, power output, position, and sometimes changes in position can be either controlled or identified. This helps make the analysis a lot easier.
10-26-22, 06:25 PM
Replies: 201
Views: 5,329
Posted By RChung

Differences between two things (not just bikes,...

Differences between two things (not just bikes, but almost any two things) can be hard to show if the tests aren't done carefully. Sometimes differences are large so even rough analyses can show the...
Forum: Road Cycling
10-23-22, 08:11 AM
Replies: 93
Views: 3,620
Posted By RChung

It would have been shorter to write: "#3, and...

It would have been shorter to write: "#3, and #5."
Forum: Road Cycling
10-22-22, 09:40 AM
Replies: 93
Views: 3,620
Posted By RChung

GhostRider62 has a stable of bikes, and his CdA...

GhostRider62 has a stable of bikes, and his CdA on those bikes range widely. On one of those bikes, his CdA is around half of what you were assuming with that online calculator; he probably does have...
Forum: Road Cycling
10-21-22, 11:48 AM
Replies: 93
Views: 3,620
Posted By RChung

Good point. I may combine 5 and 6 into 5A...

Good point.

I may combine 5 and 6 into 5A and 5B, and perhaps yours could be added as 6.

Many threads could be shorter if we just replied with a number.
Forum: Road Cycling
10-20-22, 07:15 PM
Replies: 93
Views: 3,620
Posted By RChung

Almost every argument in cycling fora: 1. Only...

Almost every argument in cycling fora:
1. Only the pros need to worry about that. Are you a pro?
2. The best riders are the best because of what they do so just imitate them.
3. Things I don't...
Forum: Road Cycling
10-19-22, 08:11 AM
Replies: 93
Views: 3,620
Posted By RChung

Very roughly speaking, .005 m^2 in CdA is small...

Very roughly speaking, .005 m^2 in CdA is small but not teeny: it's roughly equivalent to the area of a standard business card. Flapping jackets are way *way* bigger, as are aero bars vs. being on...
Forum: Road Cycling
09-27-22, 02:47 PM
Replies: 61
Views: 2,313
Posted By RChung

Pros use the data differently in training and in...

Pros use the data differently in training and in racing. Most pros show watts and HR on their displays but they don't race by HR or power, they race by RPE and tactical situation. They collect the...
Forum: Road Cycling
09-19-22, 06:18 PM
Replies: 34
Views: 689
Posted By RChung

I think that since this is the "road cycling"...

I think that since this is the "road cycling" sub-forum, y'all are missing the intended use case. I think the TyreWiz could make sense for CX, MTB, or gravel racing, where the surfaces can be far...
Forum: Road Cycling
09-18-22, 06:48 PM
Replies: 34
Views: 689
Posted By RChung

By chance I saw one just a couple of days ago. I...

By chance I saw one just a couple of days ago. I was out doing some tests with a guy who wanted to estimate his CdA and Crr so had pruchased a Notio and a TyreWiz (two, actually), so we were...
Forum: Road Cycling
09-18-22, 07:11 AM
Replies: 61
Views: 2,313
Posted By RChung

There's a story about that, too. March 2003 was a...

There's a story about that, too. March 2003 was a pretty wild time: we'd invaded Iraq. In early June I was producing a pdf of one of my own papers when it occurred to me to check the metadata for the...
Forum: Road Cycling
09-17-22, 10:47 AM
Replies: 61
Views: 2,313
Posted By RChung

Andy's talking about something related but...

Andy's talking about something related but slightly different: an initial "impulse" in power has a HR response that's quite quick but it has a HR response that lasts a long(ish) time. You can see...
Forum: Road Cycling
09-15-22, 11:11 AM
Replies: 61
Views: 2,313
Posted By RChung

For most users, a HRM is "pretty much as good" as...

For most users, a HRM is "pretty much as good" as a PM. Everything depends on what you're doing with the data.
08-28-22, 02:40 PM
Replies: 87
Views: 1,715
Posted By RChung

https://www.youtube.com/watch?v=sIY7BQkbIT8

https://www.youtube.com/watch?v=sIY7BQkbIT8
08-26-22, 08:16 PM
Replies: 87
Views: 1,715
Posted By RChung

Actually, you enter total mass and with the...

Actually, you enter total mass and with the barometric altimeter it can measure free-fall speed; it knows the gravitational constant, and if you do this repeatedly it can refine its assumption of...
08-26-22, 10:44 AM
Replies: 87
Views: 1,715
Posted By RChung

It has a barometric altimeter and a multi-axis...

It has a barometric altimeter and a multi-axis accelerometer (so essentially it has an inclinometer). It doesn't have a built-in speed or cadence sensor; you can link those if you have them.

The...
08-26-22, 10:06 AM
Replies: 87
Views: 1,715
Posted By RChung

This thread is a wild ride. I've worked on...

This thread is a wild ride.

I've worked on airspeed measuring devices, both to infer power by assuming drag parameters, and combined with an exogenous power measuring device to infer drag...
Forum: Road Cycling
08-23-22, 09:46 AM
Replies: 64
Views: 5,231
Posted By RChung

A while back a friend broke his clavicle in a...

A while back a friend broke his clavicle in a bike accident and had a titanium plate inserted to help the pieces knit together. Afterward he had the plate surgically removed. Here's his $80,000...
Forum: Road Cycling
07-27-22, 10:54 PM
Replies: 78
Views: 2,478
Posted By RChung

That falls under #4.

That falls under #4.
Forum: Road Cycling
07-25-22, 10:25 AM
Replies: 78
Views: 2,478
Posted By RChung

Almost every argument in cycling fora: 1. Only...

Almost every argument in cycling fora:
1. Only the pros need to worry about that. Are you a pro?
2. The best riders are the best because of what they do so just imitate them.
3. Things I don't...
07-18-22, 12:33 PM
Replies: 27
Views: 619
Posted By RChung

Elevation gain is a measurement used to classify...

Elevation gain is a measurement used to classify how difficult a ride was or would be, from the time before power meters. I blame Jobst.

That said, most riders still don't have power meters--but...
Forum: Road Cycling
07-16-22, 12:26 PM
Replies: 6
Views: 525
Posted By RChung

How fast was your driveway spin? You can...

How fast was your driveway spin?

You can check this by holding your front wheel in the air and turning the bars left and right, then spinning it as fast as you can and turning the bars left and...
07-11-22, 10:05 PM
Replies: 52
Views: 1,970
Posted By RChung

Well, if you have a power meter you can calculate...

Well, if you have a power meter you can calculate the energy used for all those accelerations and decelerations. Yes, you need to accelerate each additional kilo of mass, but your momentum is thereby...
07-06-22, 07:22 PM
Replies: 13
Views: 847
Posted By RChung

No. But TTs are done in competition against...

No.

But TTs are done in competition against others. There are conditions (wind, hills) where even though everyone is slower, you might lose less than they do. At least, that's what you're aiming...
Forum: Road Cycling
07-02-22, 03:55 PM
Replies: 125
Views: 2,752
Posted By RChung

They certainly shift more than I do, but I don't...

They certainly shift more than I do, but I don't know whether that's because they use di2 and I don't. I shift more with modern brifters and 11-speed than I did when I used downtube shifters and...
07-01-22, 05:57 PM
Replies: 41
Views: 1,298
Posted By RChung

This is a variant of point #3 in post 36 above:...

This is a variant of point #3 in post 36 above: "If it's not important to me, it needn't be important to anyone else; and if it *is* important to you, then you don't count."
Forum: Road Cycling
06-30-22, 06:13 PM
Replies: 125
Views: 2,752
Posted By RChung

The relationship between cadence and metabolic...

The relationship between cadence and metabolic efficiency has been studied quite a lot. Here are a couple that use "well-trained" cyclists as the subjects....
Forum: Road Cycling
06-30-22, 02:12 PM
Replies: 125
Views: 2,752
Posted By RChung

The study population was "capable but not...

The study population was "capable but not competitive cyclists."
Forum: Road Cycling
06-30-22, 02:11 PM
Replies: 125
Views: 2,752
Posted By RChung

I have Matthieu van der Poel's data file from his...

I have Matthieu van der Poel's data file from his winning ride in this year's Ronde. Here's the distribution of his cadence data:
median: 91 rpm
75th percentile: 98
90th percentile: 102
95th...
Showing results 1 to 50 of 285
 


 
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