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Search: Posts Made By: RChung
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Forum: Road Cycling
08-05-20, 10:02 PM
Replies: 75
Views: 3,422
Posted By RChung

Oh. That's different. Never mind.

Oh. That's different.

Never mind.
Forum: Road Cycling
08-05-20, 09:34 PM
Replies: 75
Views: 3,422
Posted By RChung

Many years ago I lived next door to a woman who...

Many years ago I lived next door to a woman who had toy dogs who barked all ****ing day. Cutting out their squeakers is a good idea but putting them in my shoes would have been messy.
Forum: Road Cycling
08-05-20, 01:52 PM
Replies: 75
Views: 3,422
Posted By RChung

Hey, we all once had 0 posts. BoraxKid isn't...

Hey, we all once had 0 posts. BoraxKid isn't wrong because he has 17 posts. He's wrong and he has 17 posts.
Forum: Road Cycling
07-26-20, 12:32 PM
Replies: 36
Views: 1,357
Posted By RChung

https://www.youtube.com/watch?v=ibycOXD-Mw0

https://www.youtube.com/watch?v=ibycOXD-Mw0
Forum: Road Cycling
07-14-20, 09:30 AM
Replies: 270
Views: 10,450
Posted By RChung

Hyperloop.

Hyperloop.
Forum: Road Cycling
07-13-20, 09:16 AM
Replies: 270
Views: 10,450
Posted By RChung

Um, I guess you could say that there has been...

Um, I guess you could say that there has been some discussion.
Forum: Road Cycling
07-13-20, 08:51 AM
Replies: 270
Views: 10,450
Posted By RChung

20 meters? Really? Even with no wind, that's way...

20 meters? Really? Even with no wind, that's way too far back. At one bike length off a field, you're feeling the wind. At two bike lengths, you'll be struggling. At three, you're dropped.[/QUOTE]...
Forum: Road Cycling
07-11-20, 07:48 AM
Replies: 125
Views: 5,923
Posted By RChung

That depends on how careful you're being in...

That depends on how careful you're being in testing. If you're being really careful, you can reliably discern a difference in Crr *on the road* of maybe around 5% or maybe a bit less (I prefer to...
Forum: Road Cycling
07-10-20, 05:18 PM
Replies: 125
Views: 5,923
Posted By RChung

Almost always, the rank ordering of tires on...

Almost always, the rank ordering of tires on rollers is the same as on the road. Sometimes two tires will swap ranking, but usually that's when the tires are pretty close to begin with. An exception...
Forum: Road Cycling
07-10-20, 05:04 PM
Replies: 125
Views: 5,923
Posted By RChung

You can do both, you know. That's allowed.

You can do both, you know. That's allowed.
Forum: Road Cycling
07-08-20, 08:52 AM
Forum: Road Cycling
07-03-20, 09:30 AM
Replies: 101
Views: 6,060
Posted By RChung

Actually, at the time I wrote that a month ago,...

Actually, at the time I wrote that a month ago, we were lacking a great deal of detail on racial and ethnic disparities in mortality reports: the initial data showed some info on age and sex, but...
Forum: Road Cycling
06-28-20, 09:51 PM
Replies: 15
Views: 719
Posted By RChung

We've measured differences in drive train losses....

We've measured differences in drive train losses. We know it wasn't chain angle because we jury-rigged a frankencassette with small cogs inboard of large cogs so the small-small combo had the same...
Forum: Road Cycling
06-28-20, 09:48 PM
Replies: 15
Views: 719
Posted By RChung

For the same gear ratio and same cadence, the...

For the same gear ratio and same cadence, the small chainring-small cog combo chain travels slower than a big chainring-big cog chain. For example, a 39-13 and a 54-18 are the same gear ratio, so if...
Forum: Road Cycling
06-28-20, 04:47 PM
Replies: 15
Views: 719
Posted By RChung

If the gear ratios are the same and the cadence...

If the gear ratios are the same and the cadence is the same then your speed will be the same and your power will be the same.

(There are small differences in drive train efficiency so it's not...
Forum: Road Cycling
06-27-20, 07:16 AM
Replies: 85
Views: 4,125
Posted By RChung

Ray has a lot more patience than I have. ...

Ray has a lot more patience than I have.


I've known Ray for years, and have worked on a few power meter related projects with him, including that one in the wind tunnel, but also a few others. I...
Forum: Road Cycling
06-26-20, 06:54 PM
Replies: 85
Views: 4,125
Posted By RChung

I don't have a philosophical problem with the...

I don't have a philosophical problem with the Power Pod or the way it measures drag force, and I certainly don't have a problem with measuring the "demand side" of power rather than the supply side...
Forum: Road Cycling
06-26-20, 01:57 PM
Replies: 85
Views: 4,125
Posted By RChung

https://en.wikipedia.org/wiki/Barometer_question#C...

https://en.wikipedia.org/wiki/Barometer_question#Calandra's_account
Forum: Road Cycling
06-25-20, 02:03 PM
Replies: 85
Views: 4,125
Posted By RChung

I don't sell power meters, nor do I fit riders....

I don't sell power meters, nor do I fit riders. The guy who did this study (https://pubmed.ncbi.nlm.nih.gov/28482367/) (from 2017) doesn't, either.

...
Forum: Road Cycling
06-25-20, 08:00 AM
Replies: 85
Views: 4,125
Posted By RChung

Yeah. You can often find used G3 models pretty...

Yeah. You can often find used G3 models pretty cheap--in January, a guy I know bought a used G3 hub mounted in a 28-spoke rim (okay but not great, and needed a little truing) with a still usable tire...
Forum: Road Cycling
06-22-20, 04:10 PM
Replies: 37
Views: 1,099
Posted By RChung

Yeah. Chris Yu talked about this on a cyclingtips...

Yeah. Chris Yu talked about this on a cyclingtips podcast, and I *think* he was saying closer to half (though he also agreed with you and said it depends on how aero the rest of the frame is).
Forum: Road Cycling
06-14-20, 06:45 PM
Replies: 57
Views: 3,138
Posted By RChung

Good racers are really good at not spending a...

Good racers are really good at not spending a joule more than they need to.

In The Rider, Krabbe says, "A man along the road shouts 'Faster!' Probably thinks bicycle racing is about going fast." A...
Forum: Road Cycling
06-14-20, 01:05 PM
Replies: 57
Views: 3,138
Posted By RChung

The average difference is small, but racing (and,...

The average difference is small, but racing (and, sometimes, just riding) isn't about average differences. It's about going way past threshold but managing to stay on the wheel in front of you....
Forum: Road Cycling
06-12-20, 08:07 AM
Replies: 57
Views: 3,138
Posted By RChung

Some sources of drag that fall beneath the...

Some sources of drag that fall beneath the threshold of "tangibility" matter a lot; some things that are tangible don't matter much at all. I'm not sure that tangibility is a good metric of drag.
...
Forum: Road Cycling
06-11-20, 10:01 PM
Replies: 57
Views: 3,138
Posted By RChung

Not recently. I was forced to a few years ago...

Not recently. I was forced to a few years ago when my beloved aluminum crit racing bike that had taken me years to get just right was stolen and I replaced it with a then-aero bike. I'm only...
Forum: Road Cycling
06-10-20, 09:13 AM
Replies: 8
Views: 242
Posted By RChung

The PT SL+ hub was the revision to make sure it...

The PT SL+ hub was the revision to make sure it worked with standard ANT+ devices. The "+" is essential: the non-plus SL model would work ONLY with Power Tap's own head unit. Make sure it's a "+"...
Forum: Road Cycling
06-04-20, 11:23 AM
Replies: 101
Views: 6,060
Posted By RChung

1. You can't measure rolling resistance in a wind...

1. You can't measure rolling resistance in a wind tunnel.
2. There are ways to measure rolling resistance without a power meter but they all require, at a minimum, known force.
3. I've presented...
Forum: Road Cycling
06-03-20, 09:06 AM
Replies: 101
Views: 6,060
Posted By RChung

84 miles of riding. Well, thanks for that. I...

84 miles of riding. Well, thanks for that. I agree that it's hard to know exactly what's happening, but it's nice that you're trying.


The power estimates come from the speed. The estimates are...
Forum: Road Cycling
05-27-20, 09:49 AM
Replies: 103
Views: 4,953
Posted By RChung

Whoa. Plot twist. Didn't see that coming.

Whoa. Plot twist. Didn't see that coming.
Forum: Road Cycling
05-27-20, 12:01 AM
Replies: 65
Views: 2,857
Posted By RChung

Yeah. It's easy to spot and handle anomalies like...

Yeah. It's easy to spot and handle anomalies like a second of 200+rpm. What's harder is spotting errors that are *almost but not quite* right. Elsewhere there's a discussion going on about pedaling...
Forum: Road Cycling
05-26-20, 10:34 PM
Replies: 65
Views: 2,857
Posted By RChung

People aren't constants. Their interests change,...

People aren't constants. Their interests change, and it's hard to know who's going to end up interested in something they aren't interested in right now. There do appear to be some riders here who...
Forum: Road Cycling
05-25-20, 08:18 PM
Replies: 65
Views: 2,857
Posted By RChung

Oh, I think I've said that too, since I think the...

Oh, I think I've said that too, since I think the majority of riders use their power meters in pretty simple ways. That said, some don't, and we can't know ahead of time who is going to be in which...
Forum: Road Cycling
05-24-20, 10:15 AM
Replies: 65
Views: 2,857
Posted By RChung

Sigh. 1. It's possible to check the accuracy...

Sigh.

1. It's possible to check the accuracy of a bathroom scale.
2. Whether consistency is all you need depends on what you're doing with the information.
3. My step dad was a butcher so I used...
Forum: Road Cycling
05-23-20, 09:14 AM
Replies: 65
Views: 2,857
Posted By RChung

You wouldn't need to prepare to pedal with one...

You wouldn't need to prepare to pedal with one leg if you always go into your yard with someone slower.
Forum: Road Cycling
05-23-20, 09:09 AM
Replies: 65
Views: 2,800
Posted By RChung

I already "liked" your post but I like it so much...

I already "liked" your post but I like it so much I wish I could "like" it again.


I wouldn't quite say that. I would say that NP is actually pretty transparent about what it's doing. It tells...
Forum: Road Cycling
05-20-20, 07:13 PM
Replies: 65
Views: 2,857
Posted By RChung

One-legged drills make a lot of sense if you have...

One-legged drills make a lot of sense if you have only one leg.

The overall rule is one should pedal with as many legs as one has.
Forum: Road Cycling
05-20-20, 03:29 PM
Replies: 65
Views: 2,857
Posted By RChung

Thanks. The P2M and Quarq impute L/R split but...

Thanks. The P2M and Quarq impute L/R split but don't actually observe it directly. But from a functional standpoint, I agree with you -- what matters is total power, and you seem to be pretty...
Forum: Road Cycling
05-19-20, 01:41 PM
Replies: 65
Views: 2,857
Posted By RChung

It depends on why there's an asymmetry, how big...

It depends on why there's an asymmetry, how big it is, and what you need the data for. I do some things with a power meter that require accuracy across the entire range of power from low up to high,...
Forum: Road Cycling
05-19-20, 01:15 PM
Replies: 65
Views: 2,857
Posted By RChung

There are lots of things you can do with a power...

There are lots of things you can do with a power meter and some require more accuracy, while others require less. Most (?) riders just use a PM for training FTP, and training FTP is one of the least...
Forum: Road Cycling
05-19-20, 11:48 AM
Replies: 65
Views: 2,857
Posted By RChung

Depends on how budget-constrained you are --...

Depends on how budget-constrained you are -- wired SRMs and PT hubs are out of fashion but rock solid. Everyone seems to want pedal or crank arm PMs so used hub and crank spider PMs are cheap. I know...
Forum: Road Cycling
04-16-20, 09:32 AM
Replies: 12
Views: 864
Posted By RChung

You're lucky. Frank was an incessant and...

You're lucky. Frank was an incessant and infatigable participant on many fora. His posts, both in quantity and quality, made a lot more sense when viewed as performance art.
Forum: Road Cycling
03-26-20, 08:19 PM
Replies: 65
Views: 2,800
Posted By RChung

I've been using a power meter for a reasonably...

I've been using a power meter for a reasonably long time, and I used a HRM for several years before that. Maybe 15 years ago my HR belt broke but by then I was so used to using power and RPE that I...
Forum: Road Cycling
03-25-20, 04:10 PM
Replies: 65
Views: 2,800
Posted By RChung

The best direct evidence of effectiveness is...

The best direct evidence of effectiveness is whether you're faster for longer durations, or more comfortable at the same speed for the same durations.
Forum: Road Cycling
03-25-20, 09:27 AM
Replies: 65
Views: 2,800
Posted By RChung

Sounds like you don't need a power meter at all.

Sounds like you don't need a power meter at all.
Forum: Road Cycling
03-24-20, 09:50 AM
Replies: 76
Views: 2,663
Posted By RChung

Bare skin is slower than well-fitting clothing....

Bare skin is slower than well-fitting clothing. That's been tested and measured.
Forum: Road Cycling
03-19-20, 10:25 PM
Replies: 76
Views: 2,663
Posted By RChung

I've been wondering this for a while. I asked...

I've been wondering this for a while. I asked Josh Poertner on his Marginal Gains podcast about it: he thought it would but he hadn't tested it either. OTOH, Tom Anhalt thinks it won't. If you know...
Forum: Road Cycling
02-20-20, 10:12 AM
Replies: 42
Views: 2,275
Posted By RChung

Close. It's kinda complicated, so if your eyes...

Close. It's kinda complicated, so if your eyes are already glazing it's time to skip this message.

Many crank spider-based power meters used to use a single magnet and reed switch to measure...
Forum: Road Cycling
02-16-20, 03:49 PM
Replies: 42
Views: 2,275
Posted By RChung

Actually, they haven't -- but they like it when...

Actually, they haven't -- but they like it when others think they do.
Forum: Road Cycling
02-15-20, 11:53 AM
Replies: 42
Views: 2,275
Posted By RChung

The research evidence seems to show mixed...

The research evidence seems to show mixed results, with no clear evidence that they either help or hurt. Some riders like the feel, others don't. What this means is that you can be free to choose...
Forum: Road Cycling
01-29-20, 04:47 PM
Replies: 24
Views: 845
Posted By RChung

I don't really have a comment to add. I'm just...

I don't really have a comment to add. I'm just responding so I can put a tag on your delicious post and visit it again and again.
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