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Search: Posts Made By: RChung
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Forum: Road Cycling
11-29-22, 04:58 PM
Replies: 93
Views: 3,146
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: 4,124
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: 35
Views: 1,541
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: 2,084
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: 2,084
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: 4,993
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.
10-27-22, 11:10 AM
Replies: 201
Views: 4,993
Posted By RChung

You don't have to control for differences if you...

You don't have to control for differences if you can account for them. That's what statistical controls do.
10-27-22, 10:07 AM
Replies: 201
Views: 4,993
Posted By RChung

Hmmm. How many variables do you think are needed?

Hmmm. How many variables do you think are needed?
10-26-22, 06:25 PM
Replies: 201
Views: 4,993
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: 3,146
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: 3,146
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: 3,146
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
10-21-22, 09:02 AM
Replies: 93
Views: 3,146
Posted By RChung

I think your post falls under #1 and #3.

I think your post falls under #1 and #3.
Forum: Road Cycling
10-20-22, 07:15 PM
Replies: 93
Views: 3,146
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
10-20-22, 03:50 PM
Replies: 93
Views: 3,146
Posted By RChung

Hmmm. My experience is quite different. Several...

Hmmm. My experience is quite different. Several years ago I broke my wrist and put clip on aerobars on my regular road bike (that is, it wasn't optimally set up). It was way more comfortable than...
Forum: Road Cycling
10-19-22, 08:11 AM
Replies: 93
Views: 3,146
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
10-18-22, 05:50 PM
Replies: 93
Views: 3,146
Posted By RChung

https://cimg9.ibsrv.net/gimg/bikeforums.net-vbulle...

https://cimg9.ibsrv.net/gimg/bikeforums.net-vbulletin/653x653/cda_vs_weight_92040ac50d645667a829064a450fb7ddf668fc7e.png
10-09-22, 09:28 PM
Replies: 95
Views: 2,133
Posted By RChung

https://www.youtube.com/watch?v=6jy__tBe8eg

https://www.youtube.com/watch?v=6jy__tBe8eg
Forum: Road Cycling
09-27-22, 02:47 PM
Replies: 61
Views: 2,206
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
09-20-22, 09:32 AM
Replies: 34
Views: 677
Posted By RChung

I have friends who do 12 or 24-hour rides and,...

I have friends who do 12 or 24-hour rides and, yes, they often do want to know both if their pressure changes over time and also what pressure is best for changing conditions. A couple of them use...
Forum: Road Cycling
09-19-22, 06:18 PM
Replies: 34
Views: 677
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: 677
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: 2,206
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: 2,206
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: 2,206
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.
08-29-22, 10:45 AM
Replies: 87
Views: 1,600
Posted By RChung

Yes, though the industries that manufacture and...

Yes, though the industries that manufacture and operate wind turbines for energy generation are pretty familiar with the distribution of wind speeds at a particular location (and height). Wind speeds...
08-28-22, 02:40 PM
Replies: 87
Views: 1,600
Posted By RChung

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

https://www.youtube.com/watch?v=sIY7BQkbIT8
08-26-22, 08:19 PM
Replies: 87
Views: 1,600
Posted By RChung

Early attempts at doing "cheap" power meters were...

Early attempts at doing "cheap" power meters were based on altimeters and speedometers. You can see a vestige of that each year during the TdF when guys on the Intertoobs try to infer doping behavior...
08-26-22, 08:16 PM
Replies: 87
Views: 1,600
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, 08:10 PM
Replies: 87
Views: 1,600
Posted By RChung

Hmmm. Well, part of the calculation requires that...

Hmmm. Well, part of the calculation requires that you enter the all-inclusive weight, so if you're not on the bike the total mass will be wrong. I recommend that you do this while on the bike.
...
08-26-22, 10:46 AM
Replies: 87
Views: 1,600
Posted By RChung

A good power meter substitutes for an altimeter...

A good power meter substitutes for an altimeter better than an altimeter works as a power meter.
08-26-22, 10:44 AM
Replies: 87
Views: 1,600
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: 1,600
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
08-24-22, 05:13 PM
Forum: Road Cycling
08-23-22, 09:46 AM
Replies: 64
Views: 5,048
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
07-31-22, 08:16 AM
Replies: 78
Views: 2,445
Posted By RChung

Very nice. Congratulations on your progress, and...

Very nice. Congratulations on your progress, and thanks for sharing.

So, the physics works as expected: the trend lines are explainable by improvements in power, decreased mass, and equipment...
Forum: Road Cycling
07-27-22, 10:54 PM
Replies: 78
Views: 2,445
Posted By RChung

That falls under #4.

That falls under #4.
Forum: Road Cycling
07-25-22, 10:25 AM
Replies: 78
Views: 2,445
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
07-22-22, 10:13 AM
Replies: 78
Views: 2,445
Posted By RChung

Nice data. That's a fun ride -- I used to do...

Nice data. That's a fun ride -- I used to do almost the same loop. I've climbed Conzelman on my road bike, on my "touring" bike, and on my MTB, but I haven't kept as careful records as you. Thanks.
07-18-22, 12:33 PM
Replies: 27
Views: 602
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: 516
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: 1,911
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...
07-11-22, 09:52 AM
Replies: 52
Views: 1,911
Posted By RChung

My friend Damon Rinard says when comparing bikes...

My friend Damon Rinard says when comparing bikes you can usually think about substituting the word "easier" for "faster." Human beings aren't good as measuring "faster" but our senses are pretty good...
07-06-22, 07:22 PM
Replies: 13
Views: 818
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: 2,643
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...
Forum: Road Cycling
07-02-22, 10:39 AM
Replies: 125
Views: 2,643
Posted By RChung

MvdP, TDF 22, Stage 1 ITT quantile, rpm ...

MvdP, TDF 22, Stage 1 ITT

quantile, rpm
50, 94
75, 99
90, 103
95, 105
97.5, 106
99, 108
07-01-22, 05:57 PM
Replies: 41
Views: 1,285
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
07-01-22, 10:27 AM
Replies: 125
Views: 2,643
Posted By RChung

Um, nice comment, but that's from Stephen Cheung.

Um, nice comment, but that's from Stephen Cheung.
Forum: Road Cycling
06-30-22, 06:13 PM
Replies: 125
Views: 2,643
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....
06-30-22, 05:44 PM
Replies: 41
Views: 1,285
Posted By RChung

Elsewhere I've posted a list of almost every...

Elsewhere I've posted a list of almost every cycling argument. This is #3:[indent=40px]
Showing results 1 to 50 of 1000
 


 
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