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Search: Posts Made By: RChung
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Forum: Road Cycling
07-19-24, 08:45 AM
Replies: 46
Views: 777
Posted By RChung

I don't think it necessarily necessitates it, but...

I don't think it necessarily necessitates it, but I think the issue isn't "closed hip angle" as much as "thigh-chest clearance." You're being rotated around the BB and most riders are thinking more...
Forum: Road Cycling
07-19-24, 08:13 AM
Replies: 46
Views: 777
Posted By RChung

It's not just the weight of the aero bars (and...

It's not just the weight of the aero bars (and the stuff you hang off one). In addition, TT or tri bikes typically have a steeper seat tube angle: that's because they're "rotating" you clockwise...
Forum: Road Cycling
07-18-24, 09:38 PM
Replies: 46
Views: 777
Posted By RChung

I disagree. A properly fit TT bike can be quite...

I disagree. A properly fit TT bike can be quite comfortable--it's not always, but it can be. That's why they're used on RAAM, and in full IMs where you have to run a marathon afterward. I broke my...
07-13-24, 05:23 PM
Replies: 142
Views: 5,908
Posted By RChung

When I was a kid I was told of a headline in the...

When I was a kid I was told of a headline in the SF Chronicle: "Tenth day of 70+ temps: no relief in sight."
07-11-24, 08:37 PM
Replies: 142
Views: 5,908
Posted By RChung

Sure, but London, Ontario is half a degree...

Sure, but London, Ontario is half a degree *north* of the California state line, i.e., it's at a latitude equivalent to Oregon. That's like saying "Oregon is about at the same latitude as Northern...
07-11-24, 04:02 PM
Replies: 142
Views: 5,908
Posted By RChung

Yeah, right.

Yeah, right.
07-11-24, 08:08 AM
Replies: 43
Views: 2,757
Posted By RChung

Yep. When looking at the oldest individuals, we...

Yep. When looking at the oldest individuals, we use official birth records to verify date of birth (and thus current age), so the oldest old always come from countries with good vital statistics...
Forum: Road Cycling
07-07-24, 10:34 AM
Replies: 45
Views: 1,132
Posted By RChung

Ventilation is a big issue nowadays and designs...

Ventilation is a big issue nowadays and designs try to manage air flow both around the helmet and through the helmet. A large part of the flow management for TT helmets is how the air comes off the...
07-06-24, 10:13 AM
Replies: 17
Views: 842
Posted By RChung

I see what you did there.

I see what you did there.
07-06-24, 10:08 AM
Replies: 81
Views: 3,177
Posted By RChung

https://www.youtube.com/watch?v=Oo9buo9Mtos

https://www.youtube.com/watch?v=Oo9buo9Mtos
07-05-24, 05:02 PM
Replies: 159
Views: 5,179
Posted By RChung

The fastest second halves (the descent and run-in...

The fastest second halves (the descent and run-in to the finish line) were done by guys whose start times were 2 and 3 hours ahead of Pogacar, Evenepoel, Roglic, and Vingegaard. There was also a...
07-05-24, 02:00 PM
Replies: 159
Views: 5,179
Posted By RChung

Yep. There's also weak evidence that the...

Yep.

There's also weak evidence that the wind may have changed during the afternoon
07-05-24, 01:23 PM
Replies: 159
Views: 5,179
Posted By RChung

https://cimg5.ibsrv.net/gimg/bikeforums.net-vbulle...

https://cimg5.ibsrv.net/gimg/bikeforums.net-vbulletin/672x672/tdf2024_7_0830fe4a2634e28080a3b457f16277b0c46b3240.png
Forum: Road Cycling
07-04-24, 01:46 PM
Replies: 57
Views: 1,590
Posted By RChung

My weakness is that I'm old, fat, and slow. My...

My weakness is that I'm old, fat, and slow. My strength is that I'm a good listener. When we start up the hill, I find a guy who's faster and say, "So, how's work?" Then he slows down to talk while...
Forum: Fatbikes
07-04-24, 08:47 AM
Replies: 6
Views: 1,381
Posted By RChung

Thanks for that. People often try to do...

Thanks for that.

People often try to do these tests by controlling power (and position) and looking at differences in speed. You can get better results by varying power and speed and controlling...
Forum: Road Cycling
07-03-24, 04:34 PM
Replies: 34
Views: 1,520
Posted By RChung

Every bike I've had exceeded my needs and...

Every bike I've had exceeded my needs and gloriously so.
06-15-24, 12:55 PM
Replies: 117
Views: 7,527
Posted By RChung

Zwift introduced some new roads on Wednesday, and...

Zwift introduced some new roads on Wednesday, and on Thursday I did the new segment up "The Grade." I think that's the first time I've ever ranked so highly on a climbing segment: I was in the top 10...
06-12-24, 11:09 PM
Replies: 27
Views: 1,519
Posted By RChung

Ummm, I was being facetious. There're several...

Ummm, I was being facetious. There're several things you can learn from data like that; you can learn even more if you combine the power data with something else, like speed or cadence or heart rate;...
Forum: Road Cycling
06-10-24, 11:24 AM
Replies: 60
Views: 2,322
Posted By RChung

When you're running a negative cash flow is...

When you're running a negative cash flow is exactly when you most need to track your bank balance.
06-10-24, 12:28 AM
Replies: 37
Views: 3,957
Posted By RChung

Ah! Much better than before. Paris is a beautiful...

Ah! Much better than before. Paris is a beautiful city but it used to be prudent not to walk and admire at the same time: you'd walk carefully then when you wanted to see something you'd stop and...
06-09-24, 09:44 PM
Replies: 37
Views: 3,957
Posted By RChung

There are two types of Velib bikes, electric and...

There are two types of Velib bikes, electric and "acoustic." Both are sturdy but the acoustic bikes cost less so there's high demand for them at commute hours -- for a tourist, this is less of a...
05-31-24, 09:17 AM
Replies: 10
Views: 556
Posted By RChung

If what you're doing isn't producing the results...

If what you're doing isn't producing the results you want then continuing to do what you're doing probably won't either.
05-30-24, 09:51 AM
Replies: 27
Views: 1,519
Posted By RChung

I think one of the uses of power data is to...

I think one of the uses of power data is to figure out what you're good at, and what you need to work on. People say, "train your weakness, race your strength" but I used to choose my races to...
05-28-24, 09:23 AM
Replies: 27
Views: 1,519
Posted By RChung

In this matter, I agree more with PeteHski than...

In this matter, I agree more with PeteHski than Jughed. I think simply monitoring what you're doing and how it feels for a while is a perfectly fine, even appropriate, way forward. I don't think you...
Forum: Road Cycling
05-27-24, 07:48 PM
Replies: 60
Views: 2,322
Posted By RChung

I advise people who get their first power meter...

I advise people who get their first power meter to just do their ordinary rides at their normal pace for a little while -- maybe 10 rides or so. Record the data in a little notebook, but don't change...
Forum: Road Cycling
05-23-24, 08:17 AM
Replies: 20
Views: 694
Posted By RChung

As long as the BB is compatible, moving a...

As long as the BB is compatible, moving a crank-spider-based PM is simpler and faster than moving two pedals (if you have the right wrench): there's only one fastener to undo and tighten, rather than...
05-22-24, 08:18 AM
Replies: 33
Views: 2,592
Posted By RChung

Let's say "au revoir," not "adieu." Best...

Let's say "au revoir," not "adieu." Best wishes.
05-20-24, 04:54 PM
Replies: 21
Views: 932
Posted By RChung

Good clue. Here's the Garmin support page that...

Good clue. Here's the Garmin support page that identifies where the port is on a 540 -- I'm not sure where it is on the 530, but you could look. I think they say not to blow compressed air into it,...
05-20-24, 01:51 PM
Replies: 21
Views: 932
Posted By RChung

Then I'll repeat my suggestion: compare the...

Then I'll repeat my suggestion: compare the downloaded elevation profile with the actual elevation profile. What you're looking for is 1) if it was recording properly for a while and then suddenly...
05-15-24, 02:39 PM
Replies: 43
Views: 2,757
Posted By RChung

We think so, but we're mostly doing age-specific...

We think so, but we're mostly doing age-specific sex-specific cause-specific mortality, and you can't get that by zip code (or even many counties: some counties in the US are really small). That...
05-15-24, 10:48 AM
Replies: 43
Views: 2,757
Posted By RChung

Not sure. AFAIK, we don't have a lot of...

Not sure. AFAIK, we don't have a lot of longitudinal cross-national measurements of VO2Max. But, as I mentioned in the other post, you have to be among the richest decile in the US to get the average...
05-15-24, 10:32 AM
Replies: 43
Views: 2,757
Posted By RChung

Alas, we've also looked at trends in life...

Alas, we've also looked at trends in life expectancy by income levels. Males have to be in the top 10% of income in the US to have the same life expectancy as the *average* in the UK: the other 90%...
05-11-24, 11:16 AM
Replies: 37
Views: 2,444
Posted By RChung

https://cimg4.ibsrv.net/gimg/bikeforums.net-vbulle...

https://cimg4.ibsrv.net/gimg/bikeforums.net-vbulletin/672x672/giro24_7_85342ada3300b281ecb3b90df02271642def0281.png
05-09-24, 03:59 PM
Replies: 6
Views: 423
Posted By RChung

Zones are used to clarify communication,...

Zones are used to clarify communication, especially between a coach and an athlete. The coach may have a specific workout goal in mind and to make sure the athlete follows the plan, more specificity...
05-09-24, 11:13 AM
Replies: 44
Views: 2,196
Posted By RChung

Back when I was a grad student, the then-chair of...

Back when I was a grad student, the then-chair of the department, a member of the NAS, used to remind us, "Argumentum ad hominem is, 'Your argument is trash because you're a dick,' it's not 'Your...
Forum: Road Cycling
05-08-24, 09:36 AM
Replies: 35
Views: 2,709
Posted By RChung

There are (at least) three things to consider: ...

There are (at least) three things to consider:

1. Which tire matches your rims best?
2. How fast do you expect to ride?
3. How rough/smooth do you expect the road surface to be?

I would think...
05-07-24, 09:08 AM
Replies: 43
Views: 2,757
Posted By RChung

Is VO2Max the best predictor of lifespan?

Peter Attia has been saying this, and now a new GCN video repeats it. GCN video

This is not a criticism of the main point, which is that cardiorespiratory fitness is a good thing to have. That...
Forum: Road Cycling
05-06-24, 07:30 PM
Replies: 61
Views: 3,915
Posted By RChung

"Every once in a while someone along the road...

"Every once in a while someone along the road lets us know how far behind we are. A man shouts: ‘Faster!’ He probably thinks bicycle racing is about going fast." -- Tim Krabbe, The Rider
Forum: Road Cycling
05-06-24, 12:40 PM
Replies: 61
Views: 3,915
Posted By RChung

Damon Rinard, my friend now at Cannondale (but...

Damon Rinard, my friend now at Cannondale (but ex-Cervelo, ex-Trek, ex-Kestrel, and ex-rec.bicycles.tech) sometimes says we got it wrong when we started obsessing about how much *faster* a change...
Forum: Road Cycling
05-06-24, 10:40 AM
Replies: 85
Views: 4,488
Posted By RChung

Deflection is not the main "cause" of rolling...

Deflection is not the main "cause" of rolling resistance. When dropped on a hard floor, a basketball will bounce higher than a bowling ball even though the basketball "deflects" more. On a hard...
Forum: Road Cycling
05-06-24, 10:33 AM
Replies: 85
Views: 4,488
Posted By RChung

Back in the day, we relied on Jobst to address...

Back in the day, we relied on Jobst to address this.
Forum: Road Cycling
05-06-24, 09:48 AM
Replies: 85
Views: 4,488
Posted By RChung

Close. The OP asked about both wheels and tires....

Close. The OP asked about both wheels and tires. The tires effect scales like slope, and that effect can outweigh (heh) weight differences. The wheel effect is almost entirely captured by difference...
Forum: Road Cycling
05-06-24, 08:55 AM
Replies: 85
Views: 4,488
Posted By RChung

Oh, I'm *not* saying that wheel weight doesn't...

Oh, I'm *not* saying that wheel weight doesn't matter: I'm saying that the acceleration component of the total effect is small compared to the wheel weight effect. Nor am I saying that the...
Forum: Road Cycling
05-04-24, 09:32 AM
Replies: 85
Views: 4,488
Posted By RChung

Yeah. I think Ballard does pretty good analysis,...

Yeah. I think Ballard does pretty good analysis, though I was surprised that, in that video, he said that he was surprised about the result. I thought that was well-understood even if not always...
Forum: Road Cycling
05-03-24, 11:34 PM
Replies: 85
Views: 4,488
Posted By RChung

Yup. Tom is a very careful experimentalist, and...

Yup. Tom is a very careful experimentalist, and gets high precision results -- better than I, damn him. We didn't do many simulations (a few, but not many). We mostly worked with data that we or...
Forum: Road Cycling
05-02-24, 07:01 PM
Replies: 61
Views: 3,915
Posted By RChung

Lower gearing allows for lower maximum crank...

Lower gearing allows for lower maximum crank torque and lower minimum speed (before falling over), and thus lower power. Lower gearing isn't so much to make you climb faster, it's to allow you to...
Forum: Road Cycling
05-02-24, 06:35 PM
Replies: 85
Views: 4,488
Posted By RChung

I'd put handlebars between tires and wheels.

I'd put handlebars between tires and wheels.
Forum: Road Cycling
05-02-24, 04:38 PM
Replies: 61
Views: 3,915
Posted By RChung

An eighth of a millenium.

An eighth of a millenium.
05-02-24, 08:06 AM
Replies: 17
Views: 1,566
Posted By RChung

https://youtu.be/dVXZh6oVhqI?feature=shared

https://youtu.be/dVXZh6oVhqI?feature=shared
Forum: Road Cycling
05-01-24, 02:17 PM
Replies: 85
Views: 4,488
Posted By RChung

Ironically, the improvement in speed from tires...

Ironically, the improvement in speed from tires works like climbing a hill: a reduction in Crr (the coefficient of rolling resistance) of .004 (=0.4%) has an effect on speed exactly like reducing the...
Showing results 1 to 50 of 544
 


 
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