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Search: Posts Made By: RChung
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Forum: Road Cycling
09-27-22, 02:47 PM
Replies: 59
Views: 1,621
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: 587
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: 587
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: 587
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: 59
Views: 1,621
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: 59
Views: 1,621
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: 59
Views: 1,621
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: 1,460
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: 1,460
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: 1,460
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: 1,460
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: 1,460
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: 1,460
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: 1,460
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: 1,460
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: 4,738
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: 2,351
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: 2,351
Posted By RChung

That falls under #4.

That falls under #4.
Forum: Road Cycling
07-25-22, 10:25 AM
Replies: 78
Views: 2,351
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: 2,351
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: 575
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: 502
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: 1,821
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: 1,821
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: 623
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: 2,516
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: 2,516
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: 1,253
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: 2,516
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: 2,516
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: 1,253
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]
Forum: Road Cycling
06-30-22, 02:12 PM
Replies: 125
Views: 2,516
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: 2,516
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...
Forum: Road Cycling
06-28-22, 05:51 PM
Replies: 125
Views: 2,516
Posted By RChung

Ah. If you're holding constant cadence with a...

Ah. If you're holding constant cadence with a corncob regardless of flat or slope then you're almost surely putting out more (relative) power on the climbs than on the flats.

I'm thinking you...
06-28-22, 04:24 PM
Replies: 22
Views: 525
Posted By RChung

If the temp is too high (a few degrees below...

If the temp is too high (a few degrees below normal body temperature) then wind works like a convection oven and cooks you faster. It's the opposite of wind-chill.
Forum: Road Cycling
06-28-22, 04:17 PM
Replies: 125
Views: 2,516
Posted By RChung

It's hard to give an exact diagnosis without...

It's hard to give an exact diagnosis without additional info but it could be that

you have relatively good power/weight but relatively poor power/CdA.
your gearing is relatively appropriate for...
06-27-22, 02:00 PM
Replies: 41
Views: 1,253
Posted By RChung

That's interesting. Do you have any details on...

That's interesting. Do you have any details on how he did that research?
06-26-22, 09:48 AM
Replies: 41
Views: 1,253
Posted By RChung

Unless the tire has really thick tread and knobs,...

Unless the tire has really thick tread and knobs, most of the rolling resistance isn't because of the tread per se, nor the size of the contact patch. It's not the compression of the tire where...
06-24-22, 08:45 AM
Replies: 41
Views: 1,253
Posted By RChung

Tests by Al Morrison and Tom Anhalt show that...

Tests by Al Morrison and Tom Anhalt show that brand new out-of-the-box tires have slightly higher Crr than a tire that's been run for 40 or 50 km, but that over time Crr slightly increases. The...
Forum: Road Cycling
06-23-22, 10:07 AM
Forum: Road Cycling
06-23-22, 09:00 AM
Replies: 73
Views: 2,025
Posted By RChung

That chart was made a few years ago, comparing...

That chart was made a few years ago, comparing the very good Conti 4000 with the (then new) even slightly better Conti 5000. The moral of that chart is that even small improvements in Crr can matter...
Forum: Road Cycling
06-22-22, 11:29 AM
Replies: 73
Views: 2,025
Posted By RChung

TPU tubes appear to be better than lightweight...

TPU tubes appear to be better than lightweight butyl tubes in terms of Crr, but the best latex tubes are still better than that. However, TPU tubes are lighter than latex, and hold air longer....
Forum: Road Cycling
06-22-22, 10:48 AM
Replies: 73
Views: 2,025
Posted By RChung

For the purposes of hill climbing, weight matters...

For the purposes of hill climbing, weight matters but tire rolling resistance matters a lot, too. Good tires/tubes and proper inflation can be worth a fair bit of weight, and is often cheaper.

...
Forum: Commuting
06-13-22, 01:25 PM
Replies: 36
Views: 2,098
Posted By RChung

First off, congratulations on your commitment to...

First off, congratulations on your commitment to commuting.

We've long known how to get faster: more power and less drag. You'll get more powerful with continued riding, so that's taken care of.
...
Forum: Road Cycling
06-02-22, 09:33 PM
Replies: 11
Views: 323
Posted By RChung

Almost 15 years ago after a distasteful and...

Almost 15 years ago after a distasteful and infamous situation on another forum, someone put together an app that would inflate the power column of a data file by a chosen percentage. We called that...
Forum: Road Cycling
06-01-22, 06:55 PM
Replies: 11
Views: 323
Posted By RChung

That's a good reason.

That's a good reason.
Forum: Road Cycling
06-01-22, 03:21 PM
Replies: 11
Views: 323
Posted By RChung

You know how Stages sold their PM on the idea...

You know how Stages sold their PM on the idea that consistency is all that matters, and everyone who bought one repeats that? If they really believed that, they'd just report the left side and not...
Forum: Road Cycling
06-01-22, 09:09 AM
Replies: 11
Views: 323
Posted By RChung

Would you use a 96% (or maybe 104% -- I don't...

Would you use a 96% (or maybe 104% -- I don't remember which was the one-sided PM) scaling factor to adjust these data?

...
Forum: Road Cycling
05-20-22, 08:01 PM
Replies: 35
Views: 1,207
Posted By RChung

Talk to a reputable custom frame builder in your...

Talk to a reputable custom frame builder in your area about the characteristics of the bike you want. It might not be much more expensive than a big name brand and you'll get a bike that'll make you...
Showing results 1 to 50 of 1000
 


 
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