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Search: Posts Made By: RChung
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04-18-21, 09:16 AM
Replies: 96
Views: 4,458
Posted By RChung

So, Ronan asked. The Everesting rules guy said it...

So, Ronan asked. The Everesting rules guy said it would be disallowed.

Which makes me want to supertuck, throw a bottle to a bystander, and hit a ramp on a ride.
Forum: Road Cycling
04-16-21, 01:56 PM
Replies: 20
Views: 870
Posted By RChung

https://www.nytimes.com/2001/04/24/health/maximum-...

https://www.nytimes.com/2001/04/24/health/maximum-heart-rate-theory-is-challenged.html
Forum: Road Cycling
04-15-21, 03:02 PM
Replies: 20
Views: 870
Posted By RChung

It depends on your goals. Are you thinking about...

It depends on your goals. Are you thinking about competing, or are you just trying to stay up with your friends, or do you have a goal to ride across the country once you retire, or do you just want...
04-13-21, 03:40 PM
Replies: 96
Views: 4,458
Posted By RChung

The road was quite narrow. The bottom turnaround...

The road was quite narrow. The bottom turnaround was determined by a spot where a tiny little side road came in at a "T." That made the road a tiny bit wider so he could make the turnaround at a...
04-13-21, 12:51 PM
Replies: 96
Views: 4,458
Posted By RChung

That decision was made pretty early and was...

That decision was made pretty early and was already set, so I didn't ask why. There're a couple of hundred email messages discussing some hare-brained schemes we had. Fortunately, Ronan ignored the...
04-13-21, 12:03 PM
Replies: 96
Views: 4,458
Posted By RChung

Yup, but tubulars. 74 and 76 psi. Slightly used...

Yup, but tubulars. 74 and 76 psi. Slightly used tires have lower RR than brand new tires, so he used them for a few runs to break them in. He did skid on a couple of the bottom turnarounds, which is...
04-13-21, 10:23 AM
Replies: 96
Views: 4,458
Posted By RChung

Depends on how critical your needs are, and...

Depends on how critical your needs are, and different people have different needs. Some people achieve their goals not because of one single thing but because of the accretion of several tiny...
04-12-21, 07:25 PM
Replies: 96
Views: 4,458
Posted By RChung

I talked with Chris and Jon about their test...

I talked with Chris and Jon about their test protocols a while back but I don't know exactly what the road surface looked like -- they were using a not very trafficked dead end road near their...
04-12-21, 05:32 PM
Replies: 96
Views: 4,458
Posted By RChung

Whitt & Wilson give a couple of formulas to find...

Whitt & Wilson give a couple of formulas to find the equivalent drag on drums of different diameters. Both bicyclerollingresistance.com and Tom Anhalt's tests make this adjustment to convert from...
04-11-21, 12:12 PM
Replies: 12
Views: 691
Posted By RChung

From a message sent yesterday to UC Berkeley...

From a message sent yesterday to UC Berkeley faculty, students, and staff via the WarnMe list:
04-10-21, 12:00 PM
Replies: 41
Views: 1,403
Posted By RChung

I'm slower than I used to be, I have no illusions...

I'm slower than I used to be, I have no illusions about that. That's why I need a power meter: to keep me from being even slower.

As for price, I usually recommend that new users buy a used power...
04-09-21, 10:23 AM
Replies: 96
Views: 4,458
Posted By RChung

Jan appears to think that, too, so he disbelieves...

Jan appears to think that, too, so he disbelieves that any method of testing could have a smaller margin of error to any other method of testing, which is why he doubts that any other method could be...
04-08-21, 08:13 PM
Replies: 96
Views: 4,458
Posted By RChung

He appears not to believe in the "V" shape. He...

He appears not to believe in the "V" shape. He appears to believe that RR is flat, or nearly so, and then increases. Because he doesn't think there's a "V," he doesn't believe that the slope of the...
04-08-21, 06:35 PM
Replies: 96
Views: 4,458
Posted By RChung

Actually, I think Jan has said that he doubts the...

Actually, I think Jan has said that he doubts the tests that Josh and Tom Anhalt and others have done. Jan doesn't believe there's an impedance breakpoint, for example. He thinks the impedance...
04-08-21, 06:15 PM
Replies: 96
Views: 4,458
Posted By RChung

Ugh. Jan's popular and he says counter-intuitive...

Ugh. Jan's popular and he says counter-intuitive things so I'm sure I'm going to get criticized for this.

I use wider tires at lower pressures than I used to but I don't currently have a bike that...
Forum: Road Cycling
04-07-21, 07:38 PM
Replies: 95
Views: 4,914
Posted By RChung

Oh dear.

Oh dear.
Forum: Road Cycling
04-04-21, 02:36 PM
Replies: 96
Views: 2,163
Posted By RChung

Not always.

Not always.
Forum: Road Cycling
04-04-21, 02:35 PM
Replies: 96
Views: 2,163
Posted By RChung

"A little bit"? You know, although it's...

"A little bit"?

You know, although it's faster and easier to do with a power meter, there are ways to measure Crr even without a power meter. That's good because in that case, its accuracy doesn't...
Forum: Road Cycling
04-02-21, 08:35 PM
Replies: 25
Views: 709
Posted By RChung

I once told my then-gf I was interested in buying...

I once told my then-gf I was interested in buying a sextant and she said 1) she didn't know they made tents specific to that purpose and 2) we didn't need one anyway.
Forum: Road Cycling
04-02-21, 08:19 AM
Replies: 25
Views: 709
Posted By RChung

You go faster on a bike by making more power,...

You go faster on a bike by making more power, having less drag, or using smarter tactics. The stopwatch and finish line don't care which. Used properly, a high quality power meter can help you with...
Forum: Road Cycling
04-02-21, 07:56 AM
Replies: 25
Views: 709
Posted By RChung

Double check to make sure with each of the...

Double check to make sure with each of the particular models of power meters you're considering, but most of the left side modules require 10 mm of clearance between the crank and the chainstay. So...
Forum: Road Cycling
04-01-21, 11:46 AM
Replies: 29
Views: 661
Posted By RChung

Oh dear. To the OP: Sorry.

Oh dear.

To the OP: Sorry.
Forum: Road Cycling
04-01-21, 09:02 AM
Replies: 29
Views: 661
Posted By RChung

This post makes me sad. Power meters are...

This post makes me sad.

Power meters are expensive, and we buy them to help answer questions, not raise a new one: "Is my power meter off?"

The good news is that those Dura Ace power meters can...
Forum: Road Cycling
03-29-21, 11:10 AM
Replies: 40
Views: 1,295
Posted By RChung

Ah. I come from a field where inaccurate data is...

Ah. I come from a field where inaccurate data is an opportunity. Everyone has given up on those data so anything we can salvage is a plus. It turns out that even though bad data from cycling sensors...
Forum: Road Cycling
03-29-21, 09:30 AM
Replies: 40
Views: 1,295
Posted By RChung

Depends on your goals and, to some extent, your...

Depends on your goals and, to some extent, your disposition. Before I used power I tried using a HRM but couldn't quite wrap my head around the information it was telling me. Once I got power I...
Forum: Road Cycling
03-28-21, 09:42 PM
Replies: 40
Views: 1,295
Posted By RChung

I'm pretty concise.

I'm pretty concise.
Forum: Road Cycling
03-28-21, 09:23 PM
Replies: 40
Views: 1,295
Posted By RChung

Ugh. That's a simple question but a full answer...

Ugh. That's a simple question but a full answer is complex.

I'll give a short answer now and you can do some research to fill in the details. The short answer is partly that FTP is only one...
Forum: Road Cycling
03-28-21, 08:21 PM
Replies: 40
Views: 1,295
Posted By RChung

Depends on what you're doing with the data. If,...

Depends on what you're doing with the data. If, as you say, you were unaware of the lack of accuracy, then you might think your performance sucked one day and soared the next, just because you were...
Forum: Road Cycling
03-28-21, 06:46 PM
Replies: 40
Views: 1,295
Posted By RChung

On the internet nobody knows you're a dog. ...

On the internet nobody knows you're a dog.


https://cimg7.ibsrv.net/gimg/bikeforums.net-vbulletin/300x337/internet_dog_5c90fa3dcaf610c6c81c7d8a0215d79acb624426.jpg
Forum: Road Cycling
03-28-21, 02:50 PM
Replies: 40
Views: 1,295
Posted By RChung

People trained successfully for about 150 years...

People trained successfully for about 150 years without super structured interval training. Highly structured training is the recent result of power meter availability, they're not the raison d'etre...
Forum: Road Cycling
03-28-21, 01:52 PM
Replies: 40
Views: 1,295
Posted By RChung

1. I took it as *he* doesn't have a real need for...

1. I took it as *he* doesn't have a real need for a power meter.

2. I wouldn't say "significantly flawed" at all. Training (especially training FTP) is one of the least demanding things you can do...
03-26-21, 07:03 PM
Replies: 61
Views: 2,176
Posted By RChung

Approximately? In broad strokes? Okay,...

Approximately? In broad strokes?

Okay, here's an approximate rule that gets you within a percent or two for converting percent grade to degrees.

Take percent grade, divide it in half. Add a...
Forum: Road Cycling
03-20-21, 07:51 PM
Replies: 41
Views: 5,734
Posted By RChung

Whoa. That's a little big, and pretty ugly.

Whoa. That's a little big, and pretty ugly.
Forum: Road Cycling
03-18-21, 09:30 AM
Replies: 41
Views: 5,734
Posted By RChung

Depends on use case. Oddly, I just ran...

Depends on use case.

Oddly, I just ran across an example: someone was looking at the aerodynamics of handlebar bags and claimed that the bags could act as a fairing to reduce drag rather than as a...
03-17-21, 10:30 PM
Replies: 17
Views: 754
Posted By RChung

[/h1]He didn't hit a tree, or a pothole, and his...

[/h1]He didn't hit a tree, or a pothole, and his handlebar or fork didn't break; those are accidents. He was hit from behind by a motorist.

In other news, eight Atlanta-area massage workers die in...
03-17-21, 11:21 AM
Replies: 37
Views: 899
Posted By RChung

Oh god. This is why we can't have nice things.

Oh god. This is why we can't have nice things.
Forum: Road Cycling
03-02-21, 08:54 AM
Replies: 38
Views: 1,649
Posted By RChung

That's probably a fair assessment. Times when...

That's probably a fair assessment. Times when cadence (and therefore power) can be off are when you're accelerating really hard, or when you suddenly go from pedaling hard to coasting. In many power...
Forum: Road Cycling
03-01-21, 04:54 PM
Replies: 38
Views: 1,649
Posted By RChung

There are ways to check, if you wanted to know....

There are ways to check, if you wanted to know. Most people don't.
Forum: Road Cycling
02-23-21, 03:34 PM
Replies: 38
Views: 1,649
Posted By RChung

So your max cadence is in the 240 range? Wooooo!...

So your max cadence is in the 240 range? Wooooo! :D [/quote]
For some of us, "somewhere near" is somewhat loose, at least sometimes. (Last time I measured it, my max cadence was closer to 200 than...
Forum: Road Cycling
02-23-21, 09:28 AM
Replies: 38
Views: 1,649
Posted By RChung

Max power occurs neither at max force nor max...

Max power occurs neither at max force nor max rpm. Max power usually occurs somewhere near (max rpm)/2. Here are two plots taken from the same ride but perhaps an hour apart. In the black dots, I was...
02-21-21, 11:25 AM
Replies: 18
Views: 834
Posted By RChung

Ugh. All of those *could* be true, or it could be...

Ugh. All of those *could* be true, or it could be the virtual power from Zwift. There's not enough info to know.

We get power meters because we want them to help us answer questions, not raise new...
02-16-21, 01:47 PM
Replies: 82
Views: 2,358
Posted By RChung

Sometimes, smart people think if they can't...

Sometimes, smart people think if they can't figure out how to do something then no one else can, either. So if you say you can do something they can't figure out how to do they think you're either...
Forum: Road Cycling
02-15-21, 12:54 PM
Replies: 38
Views: 2,387
Posted By RChung

I agree. The most important characteristic of a...

I agree. The most important characteristic of a power meter is that it helps you answer your questions, not raise a new one ("I wonder if that's because my power meter isn't telling me the truth?")....
Forum: Road Cycling
02-13-21, 02:46 PM
Replies: 38
Views: 2,387
Posted By RChung

The G3 hub weighed less than a stock Shimano...

The G3 hub weighed less than a stock Shimano Ultegra hub, and way less than a 105 hub. In addition, you didn't need a separate speed sensor, which saved another 35-40 g (depending on which speed...
Forum: Road Cycling
02-05-21, 09:01 AM
Replies: 63
Views: 2,777
Posted By RChung

Yeah. In statistical decision theory, we...

Yeah. In statistical decision theory, we distinguish between a thing, an estimate of that thing, and an estimator used to get an estimate of that thing. For example, we talk about the least squares...
Forum: Road Cycling
02-04-21, 10:15 PM
Replies: 63
Views: 2,777
Posted By RChung

Andy has definitely disassociated himself from...

Andy has definitely disassociated himself from the 20 minute test. I think he doesn't bring it up himself unless asked *specifically* about it for understandable reasons.

That said, FTP is kinda...
Forum: Road Cycling
01-31-21, 04:36 PM
Replies: 24
Views: 1,379
Posted By RChung

Well, maybe. We had discussed Tom's "breakpoint"...

Well, maybe. We had discussed Tom's "breakpoint" findings on Wattage and ST (and via email) before that in part because we weren't sure that he hadn't made a mistake and perhaps there was something...
Forum: Road Cycling
01-31-21, 03:19 PM
Replies: 24
Views: 1,379
Posted By RChung

Yeah, that was 2009. I think of that as opening...

Yeah, that was 2009. I think of that as opening the door, but I don't think people started walking through it until they could replicate and verify the results themselves. Here's a link to Tom's 2009...
Forum: Road Cycling
01-31-21, 10:50 AM
Replies: 108
Views: 4,658
Posted By RChung

My condolences. You'll never get that part of...

My condolences. You'll never get that part of your life back. Sorry for your loss.
Forum: Road Cycling
01-31-21, 09:47 AM
Replies: 24
Views: 1,379
Posted By RChung

I think the former was way (way way) more...

I think the former was way (way way) more important than the latter.

As historical context, the first version of my paper was written and distributed in April 2007, the week *after* Paris-Roubaix....
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