Search: Posts Made By: RChung
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Forum: Recumbent
06-14-19, 04:10 PM
Replies: 41
Views: 4,743
Posted By RChung

Were you thinking of PurplePeople? He designed...

Were you thinking of PurplePeople? He designed and built a tilting trike.
Forum: Recumbent
06-14-19, 03:54 PM
Replies: 41
Views: 4,743
Posted By RChung

[/quote] And I stand by my old statement:

[/quote]
And I stand by my old statement:
Forum: Recumbent
06-14-19, 12:40 PM
Replies: 41
Views: 4,743
Posted By RChung

Um, thanks, but even I don't think I'm OK. ...

Um, thanks, but even I don't think I'm OK.

I'm just saying I didn't have ulterior motives.
Forum: Recumbent
06-13-19, 06:43 PM
Replies: 41
Views: 4,743
Posted By RChung

I was searching for something and came across...

I was searching for something and came across this thread from nearly a decade ago. Reading through it again was nostalgic. Man, you guys were suspicious back then.
Forum: Road Cycling
06-13-19, 11:36 AM
Replies: 78
Views: 5,813
Posted By RChung

You might be surprised. I've measured the CdA of...

You might be surprised. I've measured the CdA of several recumbent riders, and many riders on TT bikes. Most of the (unfaired) recumbent riders measure somewhere in the .17 to .35 m^2 range. Most of...
Forum: Road Cycling
06-13-19, 10:35 AM
Replies: 78
Views: 5,813
Posted By RChung

Yep. Actually, in terms of total "A", handlebars...

Yep. Actually, in terms of total "A", handlebars and rear wheels (and front rim shape and depth), and head tube size, have almost no effect. Their effect is almost entirely through the Cd part of...
Forum: Road Cycling
06-12-19, 10:28 PM
Replies: 78
Views: 5,813
Posted By RChung

Hmmm. Actually, usually, yes, but there are...

Hmmm. Actually, usually, yes, but there are situations where all of those things combined matter more than position.
Forum: Road Cycling
06-12-19, 05:14 PM
Replies: 78
Views: 5,813
Posted By RChung

Depends on which helmet and wheels you started...

Depends on which helmet and wheels you started with. That's particularly so for helmets, which tend to be much more individualized. That said, for most riders, in most common sizes, clothing matters...
Forum: Road Cycling
06-12-19, 10:23 AM
Replies: 78
Views: 5,813
Posted By RChung

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

You can do both, you know. That's allowed.
Forum: Road Cycling
06-12-19, 09:25 AM
Replies: 78
Views: 5,813
Posted By RChung

Then ride it on your TT.

Then ride it on your TT.
Forum: Road Cycling
06-01-19, 09:52 AM
Replies: 30
Views: 1,926
Posted By RChung

Yeah, I've done Mt. Diablo many times, including...

Yeah, I've done Mt. Diablo many times, including using that bike with the 39/26 before I took it to France. That final pitch could be pretty grim with that gearing, but I've never walked it. It would...
Forum: Road Cycling
06-01-19, 08:08 AM
Replies: 30
Views: 1,926
Posted By RChung

I think this is best. That said, the really...

I think this is best.

That said, the really steep pitches on Brasstown Bald are short. My weight and FTP are close to yours -- actually, my weight is a couple of kilos higher and my power is a few...
05-20-19, 09:30 PM
Replies: 67
Views: 3,791
Posted By RChung

Pereiro was elevated to the 2006 win after Landis...

Pereiro was elevated to the 2006 win after Landis was disqualified.
Schleck was elevated to the 2010 win after Contador was disqualified.
Forum: Road Cycling
05-18-19, 12:24 PM
Replies: 154
Views: 15,749
Posted By RChung

This really isn't a political post, just a post...

This really isn't a political post, just a post to clarify things so you can more effectively complain to the correct jurisdiction. The responsibility for different roads falls on four different...
Forum: Road Cycling
05-10-19, 11:41 PM
Replies: 56
Views: 2,755
Posted By RChung

Have you used the Aeropod? We only had it for a...

Have you used the Aeropod? We only had it for a day and were trying to compare it with two other on-bike airspeed sensors but it seemed kinda finicky.
Forum: Road Cycling
05-09-19, 03:09 PM
Replies: 154
Views: 15,749
Posted By RChung

That's not my experience. I've lived in different...

That's not my experience. I've lived in different parts of the US, and in Europe. There are definitely differences in the rates of flats I've suffered.
Forum: Road Cycling
05-09-19, 01:16 PM
Replies: 154
Views: 15,749
Posted By RChung

I don't know if there are differences in...

I don't know if there are differences in durability across the molding machines but we do know that for the 4000S there were differences in rolling resistance: one of them produced lower RR than the...
Forum: Road Cycling
05-06-19, 09:51 AM
Replies: 56
Views: 2,755
Posted By RChung

A friend has a cross bike and an older aluminum...

A friend has a cross bike and an older aluminum Cervelo Soloist, and a couple of years ago he did some field tests on them. His "standard hoods" positions were different enough that there was a...
Forum: Road Cycling
05-02-19, 09:44 AM
Replies: 65
Views: 6,555
Posted By RChung

Actually, I think these tests verify exactly what...

Actually, I think these tests verify exactly what we've known for quite a while: that there are differences in drivetrain losses, that those losses vary with chain tension, chain speed, and chain...
Forum: Road Cycling
04-28-19, 08:20 AM
Replies: 67
Views: 3,707
Posted By RChung

We know that additional bike weight doesn't...

We know that additional bike weight doesn't matter when it's flat, so you can add a lot of extra weight to a bike on flat terrain without costing you much in power. We know that as the road gets...
Forum: Road Cycling
04-27-19, 02:32 PM
Replies: 67
Views: 3,707
Posted By RChung

We can actually calculate the difference in...

We can actually calculate the difference in weight that's equivalent to a difference in rolling resistance. That difference will depend, of course, on whether you're riding on a flat road or up a...
Forum: Road Cycling
04-26-19, 10:51 AM
Replies: 67
Views: 3,707
Posted By RChung

That's kinda appropriate. The one time I used...

That's kinda appropriate. The one time I used Gatorskins I kept looking down to see if I had a flat. It was a false flat.
Forum: Road Cycling
04-26-19, 10:48 AM
Replies: 67
Views: 3,707
Posted By RChung

There's a lot of variation across individuals...

There's a lot of variation across individuals but, mostly, human beings are pretty much perceptual dullards. Whether something is perceptible to human senses isn't always a good standard. It depends...
Forum: Road Cycling
04-26-19, 08:34 AM
Replies: 67
Views: 3,707
Posted By RChung

That was just an example to convert Crr into...

That was just an example to convert Crr into something recognizable. Differences in Crr between two tires scale exactly like differences in slope: it doesn't just apply at .005. The difference...
Replies: 2,460
Views: 232,241
Posted By RChung

I didn't want to make a guess about his exact...

I didn't want to make a guess about his exact CdA. At that air density, he would've needed a watts/CdA ratio of somewhere between 1810 and 1835 (for watts at the track surface).
Replies: 2,460
Views: 232,241
Posted By RChung

This is power at the track surface. Add a few...

This is power at the track surface. Add a few watts (maybe 5 or so) if you want power at the crank spider.
...
Forum: Road Cycling
04-16-19, 09:22 AM
Replies: 45
Views: 2,108
Posted By RChung

Here's what I tell everyone once they get their...

Here's what I tell everyone once they get their very first power meter:

Just ride normally for a couple of weeks on your usual rides. Record every ride but for now keep your usual training log...
Forum: Road Cycling
04-05-19, 01:03 PM
Replies: 17
Views: 1,040
Posted By RChung

How about a power meter they paid you to use?...

How about a power meter they paid you to use? Plus, a pony.
Forum: Road Cycling
04-05-19, 11:10 AM
Replies: 17
Views: 1,040
Posted By RChung

You know what would be even better? Let's say for...

You know what would be even better? Let's say for the point of argument someone invented a free power meter. That would be better.
Forum: Road Cycling
03-23-19, 05:44 PM
Replies: 77
Views: 3,026
Posted By RChung

I've been old and slower, and old and faster. You...

I've been old and slower, and old and faster. You know what's liberating? Having a choice between the two.
03-23-19, 06:11 AM
Replies: 25
Views: 962
Posted By RChung

If you have several on all you other bikes and...

If you have several on all you other bikes and they're great, why don't you just swap one of those wheels over to your commuter/training bike?
03-22-19, 07:53 PM
Replies: 11
Views: 589
Posted By RChung

[/B][/COLOR] Thanks. Very nice. I remember...

[/B][/COLOR]

Thanks. Very nice. I remember these from that issue of Scientific American. I kept it on my bookshelf for several years. These bring back pleasant memories.
Forum: Road Cycling
03-18-19, 04:25 PM
Replies: 77
Views: 3,026
Posted By RChung

In the case of a power meter, you get both speed...

In the case of a power meter, you get both speed and power, and you can both roll down the hill and ride back up it -- so, yeah, the power meter is easier. In the case without a power meter, you're...
Forum: Road Cycling
03-18-19, 03:33 PM
Replies: 77
Views: 3,026
Posted By RChung

[/left]The general method is discussed on pp...

[/left]The general method is discussed on pp 106-108 here (http://anonymous.coward.free.fr/wattage/cda/indirect-cda.pdf), but there are some spreadsheets and sites on the intertoobs that implement...
Forum: Road Cycling
03-18-19, 12:10 PM
Replies: 77
Views: 3,026
Posted By RChung

If you absolutely can't afford a power meter and...

If you absolutely can't afford a power meter and you absolutely must know there do exist protocols that can help you estimate aero drag without a power meter (but they can be a big hassle, which is...
Forum: Road Cycling
03-15-19, 09:41 AM
Replies: 77
Views: 3,026
Posted By RChung

I don't think I said 3/4". I think I said a...

I don't think I said 3/4". I think I said a couple of inches. I don't remember exactly how far down the zipper was, but probably something like the width of two or possibly three fingers. Not much,...
Forum: Road Cycling
03-13-19, 07:35 PM
Replies: 77
Views: 3,026
Posted By RChung

The PM isn't just a training tool, or needn't be....

The PM isn't just a training tool, or needn't be. It's true that most riders use it just as they would a HRM but there are things that you can do with a PM you can't do with a HRM.

And, despite...
Forum: Road Cycling
03-13-19, 04:52 PM
Replies: 77
Views: 3,026
Posted By RChung

One of the things that can be hard to understand...

One of the things that can be hard to understand is conserving your energy for most of the time and then spending it at the best time is faster. That's especially true when racing, but still applies...
Forum: Road Cycling
03-13-19, 09:12 AM
Replies: 77
Views: 3,026
Posted By RChung

I have a story sorta like this. When my wife and...

I have a story sorta like this. When my wife and I learned that she was pregnant with our first daughter, I knew our lives would change in lots of ways. One (minor) way was that my hours on the bike...
Forum: Road Cycling
03-12-19, 07:04 PM
Replies: 43
Views: 1,424
Posted By RChung

You've gotten some good suggestions, but for...

You've gotten some good suggestions, but for others who are still on the fence:

there is relatively little difference between wheel brands and models nowadays. (I'm not saying there's no...
Forum: Road Cycling
03-12-19, 02:48 PM
Replies: 77
Views: 3,026
Posted By RChung

There are lots of ways to enjoy cycling. Some...

There are lots of ways to enjoy cycling. Some people get that enjoyment riding with a power meter. Others prefer to ride without one. A few like being killjoys. Cycling is a big tent and everyone has...
Forum: Road Cycling
03-11-19, 07:57 PM
Replies: 77
Views: 3,026
Posted By RChung

In your situation, there are actually two...

In your situation, there are actually two benefits: first, as you say, it will help you pace better so you don't go too hard early, burn out, then straggle in DFL. Second, when the friends you ride...
Forum: Road Cycling
03-07-19, 12:04 PM
Replies: 43
Views: 1,324
Posted By RChung

Josh has some pretty cool stories about testing...

Josh has some pretty cool stories about testing tire pressure and rolling resistance for Paris-Roubaix. To make sure they hit the right resonance frequency they had to test over the Arenberg at full...
Forum: Road Cycling
03-07-19, 11:06 AM
Replies: 43
Views: 1,324
Posted By RChung

Right, you don't want your tires to be so hard...

Right, you don't want your tires to be so hard that the elastomers are the most compliant part of the suspension. That's part of the "springs in series" issue.
Forum: Road Cycling
03-07-19, 09:57 AM
Replies: 52
Views: 1,848
Posted By RChung

Good point. Some smart trainers are not that...

Good point. Some smart trainers are not that expensive. That said, there are differences in how responsive smart trainers are, and how much power they can dissipate. I had an early Tacx ergometer...
Forum: Road Cycling
03-07-19, 09:46 AM
Replies: 43
Views: 1,324
Posted By RChung

Suspension systems can certainly have more...

Suspension systems can certainly have more compliance -- the question is really about how that compliance is distributed, and the "hysteresis" in the system.

I think this video shows why tire...
Forum: Road Cycling
03-06-19, 10:15 PM
Replies: 43
Views: 1,324
Posted By RChung

I like that podcast a lot and Josh is both smart...

I like that podcast a lot and Josh is both smart and fun to talk with. The "springs in series" model makes good predictions, so we have a lot of faith in it and, as Josh says, tire compliance...
Forum: Road Cycling
03-06-19, 10:14 AM
Replies: 52
Views: 1,848
Posted By RChung

A smart trainer is definitely more fun than a...

A smart trainer is definitely more fun than a dumb trainer with power meter but -- for me -- a dumb trainer+PM is *more* than halfway to a smart trainer. Since I already had a dumb trainer and a PM,...
Forum: Road Cycling
03-05-19, 05:04 PM
Replies: 35
Views: 1,244
Posted By RChung

So what you're saying is, he wasn't looking for...

So what you're saying is, he wasn't looking for cheap shots from the cheap seats so he came to bikeforums for advice and feedback?
Forum: Road Cycling
03-05-19, 02:14 PM
Replies: 35
Views: 1,244
Posted By RChung

That's a very mature outlook on life. I ain't...

That's a very mature outlook on life. I ain't that guy.
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