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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: 3,429
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: 3,429
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: 3,429
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: 1,359
Posted By RChung

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

https://www.youtube.com/watch?v=ibycOXD-Mw0
Forum: Road Cycling
07-21-20, 08:05 AM
Replies: 101
Views: 6,062
Posted By RChung

Would you describe how you do these tests? I'm...

Would you describe how you do these tests? I'm always looking for tips and tricks.
Forum: Road Cycling
07-14-20, 12:30 PM
Replies: 270
Views: 10,458
Posted By RChung

This is part of the discussion I mentioned in a...

This is part of the discussion I mentioned in a post way above.
In track racing, racers have complained for years about one country turning ventilation fans on/off when their/others' athletes were...
Forum: Road Cycling
07-14-20, 09:30 AM
Replies: 270
Views: 10,458
Posted By RChung

Hyperloop.

Hyperloop.
Forum: Road Cycling
07-13-20, 02:54 PM
Replies: 270
Views: 10,458
Posted By RChung

I suspect so. The geometry of the track, the...

I suspect so. The geometry of the track, the banking, and the shape and volume of the enclosing building matter, too. The effect size is small so if we'd been outdoors, we might've attributed it to a...
Forum: Road Cycling
07-13-20, 09:16 AM
Replies: 270
Views: 10,458
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: 10,458
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: 5,925
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: 5,925
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: 5,925
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, 04:27 PM
Replies: 125
Views: 5,925
Posted By RChung

The example I always use is the 1996 Elite Men's...

The example I always use is the 1996 Elite Men's NCNCA (that is, Northern California Nevada) District Championship 40km TT. NCNCA is pretty competitive.

PLACE TIME NAME
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07-08-20, 03:04 PM
Replies: 70
Views: 4,143
Posted By RChung

I just ran across this thread from 9 years ago....

I just ran across this thread from 9 years ago. I'd completely forgotten about it, but I think it held up pretty well.
Forum: Road Cycling
07-08-20, 12:28 PM
Replies: 125
Views: 5,925
Posted By RChung

Here's a plot that translates the difference...

Here's a plot that translates the difference between a Conti GP4K (already a pretty good tire) and a Conti GP5K in terms of equivalent weight at different gradients. If you're a weight weenie, you...
Forum: Road Cycling
07-08-20, 12:17 PM
Replies: 125
Views: 5,925
Posted By RChung

https://marginalgainspodcast.cc/tire-pressure-pion...

https://marginalgainspodcast.cc/tire-pressure-pioneer-tom-anhalt/
Forum: Road Cycling
07-08-20, 08:52 AM
Forum: Road Cycling
07-03-20, 09:30 AM
Replies: 101
Views: 6,062
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
07-02-20, 07:10 PM
Replies: 101
Views: 6,062
Posted By RChung

So, I've done tests at varying speeds including...

So, I've done tests at varying speeds including accelerations (and decelerations) to see how Crr varies. I haven't done 1000+ watt sprints (mostly because I'd need to get out of the saddle to do that...
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: 4,128
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, 11:11 PM
Replies: 85
Views: 4,128
Posted By RChung

Ah. In post #66...

Ah. In post #66 (https://www.bikeforums.net/usertag.php?do=list&action=hash&hash=66) above I mentioned a comparison "we" tried to do in 2018 of the Power Pod, the Notio Konect, and the Aerostick?...
Forum: Road Cycling
06-26-20, 10:36 PM
Replies: 85
Views: 4,128
Posted By RChung

I'm not quite sure which "YouTube guy" you're...

I'm not quite sure which "YouTube guy" you're talking about but "steady pace riding" is the lowest bar. For steady state riding all you really need is a speedometer.
Forum: Road Cycling
06-26-20, 06:54 PM
Replies: 85
Views: 4,128
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, 02:35 PM
Replies: 85
Views: 4,128
Posted By RChung

We tried doing some comparison aero testing of...

We tried doing some comparison aero testing of the Power Pod, the Notio Konect, and the Alphamantis Aerostick in the wind tunnel and the road (with a Power Tap wheel). The Power Pod was hobbled by...
Forum: Road Cycling
06-26-20, 01:57 PM
Replies: 85
Views: 4,128
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, 03:30 PM
Replies: 85
Views: 4,128
Posted By RChung

I wouldn't say "always." Not by people who know...

I wouldn't say "always." Not by people who know how to measure accuracy and precision.

That study, by the way, was mostly of power meters "out in the wild" that were on bikes that people were...
Forum: Road Cycling
06-25-20, 02:03 PM
Replies: 85
Views: 4,128
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: 4,128
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, 06:18 PM
Replies: 37
Views: 1,099
Posted By RChung

I sorta like looking dumb and mismatched. It...

I sorta like looking dumb and mismatched. It gives me an excuse when I get passed, and pleasure when I pass.
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
06-15-20, 09:02 AM
Replies: 57
Views: 3,138
Posted By RChung

Except in the title of this thread, which...

Except in the title of this thread, which contains the words "race bike."
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, 03:04 PM
Replies: 101
Views: 6,062
Posted By RChung

I just saw that, and sent a note to Josh about...

I just saw that, and sent a note to Josh about it. He should have an altitude field in the air density section.

Calculators like this are handy for steady-state approximation if given CdA, Crr,...
Forum: Road Cycling
06-04-20, 11:23 AM
Replies: 101
Views: 6,062
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
06-04-20, 09:17 AM
Replies: 101
Views: 6,062
Posted By RChung

In your very first post in this thread. You wrote:

In your very first post in this thread. You wrote:
Forum: Road Cycling
06-03-20, 09:45 PM
Replies: 101
Views: 6,062
Posted By RChung

Whoa. I checked in on this thread just 12 hours...

Whoa. I checked in on this thread just 12 hours ago. It went downhill fast.
Forum: Road Cycling
06-03-20, 09:06 AM
Replies: 101
Views: 6,062
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
05-31-20, 09:30 AM
Replies: 27
Views: 1,237
Posted By RChung

This would be measurable. When climbing, small...

This would be measurable. When climbing, small improvements in Crr dominate small improvements in either aero or mass, and we can measure all of those.
Forum: Road Cycling
05-27-20, 09:49 AM
Replies: 103
Views: 4,954
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, 11:38 PM
Replies: 65
Views: 2,857
Posted By RChung

On the newer 4-arm asymmetric right hand cranks,...

On the newer 4-arm asymmetric right hand cranks, yes. But that means Ultegra and Dura-Ace (and possibly the newest 105??). It turns out, ironically for this part of the thread, that the RHS cranks...
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...
Showing results 1 to 50 of 1000
 


 
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