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Search: Posts Made By: RChung
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Forum: Road Cycling
07-27-22, 10:54 PM
Replies: 78
Views: 2,216
Posted By RChung

That falls under #4.

That falls under #4.
Forum: Road Cycling
07-25-22, 10:25 AM
Replies: 78
Views: 2,216
Posted By RChung

Almost every argument in cycling fora: 1. Only...

Almost every argument in cycling fora:
1. Only the pros need to worry about that. Are you a pro?
2. The best riders are the best because of what they do so just imitate them.
3. Things I don't...
07-18-22, 12:33 PM
Replies: 27
Views: 566
Posted By RChung

Elevation gain is a measurement used to classify...

Elevation gain is a measurement used to classify how difficult a ride was or would be, from the time before power meters. I blame Jobst.

That said, most riders still don't have power meters--but...
Forum: Road Cycling
07-16-22, 12:26 PM
Replies: 6
Views: 483
Posted By RChung

How fast was your driveway spin? You can...

How fast was your driveway spin?

You can check this by holding your front wheel in the air and turning the bars left and right, then spinning it as fast as you can and turning the bars left and...
07-11-22, 10:05 PM
Replies: 52
Views: 1,783
Posted By RChung

Well, if you have a power meter you can calculate...

Well, if you have a power meter you can calculate the energy used for all those accelerations and decelerations. Yes, you need to accelerate each additional kilo of mass, but your momentum is thereby...
07-06-22, 07:22 PM
Replies: 13
Views: 455
Posted By RChung

No. But TTs are done in competition against...

No.

But TTs are done in competition against others. There are conditions (wind, hills) where even though everyone is slower, you might lose less than they do. At least, that's what you're aiming...
Forum: Road Cycling
07-02-22, 03:55 PM
Replies: 125
Views: 2,465
Posted By RChung

They certainly shift more than I do, but I don't...

They certainly shift more than I do, but I don't know whether that's because they use di2 and I don't. I shift more with modern brifters and 11-speed than I did when I used downtube shifters and...
07-01-22, 05:57 PM
Replies: 41
Views: 1,238
Posted By RChung

This is a variant of point #3 in post 36 above:...

This is a variant of point #3 in post 36 above: "If it's not important to me, it needn't be important to anyone else; and if it *is* important to you, then you don't count."
Forum: Road Cycling
06-30-22, 06:13 PM
Replies: 125
Views: 2,465
Posted By RChung

The relationship between cadence and metabolic...

The relationship between cadence and metabolic efficiency has been studied quite a lot. Here are a couple that use "well-trained" cyclists as the subjects....
Forum: Road Cycling
06-30-22, 02:12 PM
Replies: 125
Views: 2,465
Posted By RChung

The study population was "capable but not...

The study population was "capable but not competitive cyclists."
Forum: Road Cycling
06-30-22, 02:11 PM
Replies: 125
Views: 2,465
Posted By RChung

I have Matthieu van der Poel's data file from his...

I have Matthieu van der Poel's data file from his winning ride in this year's Ronde. Here's the distribution of his cadence data:
median: 91 rpm
75th percentile: 98
90th percentile: 102
95th...
06-28-22, 04:24 PM
Replies: 22
Views: 523
Posted By RChung

If the temp is too high (a few degrees below...

If the temp is too high (a few degrees below normal body temperature) then wind works like a convection oven and cooks you faster. It's the opposite of wind-chill.
06-26-22, 09:48 AM
Replies: 41
Views: 1,238
Posted By RChung

Unless the tire has really thick tread and knobs,...

Unless the tire has really thick tread and knobs, most of the rolling resistance isn't because of the tread per se, nor the size of the contact patch. It's not the compression of the tire where...
06-24-22, 08:45 AM
Replies: 41
Views: 1,238
Posted By RChung

Tests by Al Morrison and Tom Anhalt show that...

Tests by Al Morrison and Tom Anhalt show that brand new out-of-the-box tires have slightly higher Crr than a tire that's been run for 40 or 50 km, but that over time Crr slightly increases. The...
Forum: Road Cycling
06-23-22, 10:07 AM
Forum: Road Cycling
06-23-22, 09:00 AM
Replies: 73
Views: 1,968
Posted By RChung

That chart was made a few years ago, comparing...

That chart was made a few years ago, comparing the very good Conti 4000 with the (then new) even slightly better Conti 5000. The moral of that chart is that even small improvements in Crr can matter...
Forum: Road Cycling
06-22-22, 11:29 AM
Replies: 73
Views: 1,968
Posted By RChung

TPU tubes appear to be better than lightweight...

TPU tubes appear to be better than lightweight butyl tubes in terms of Crr, but the best latex tubes are still better than that. However, TPU tubes are lighter than latex, and hold air longer....
Forum: Road Cycling
06-22-22, 10:48 AM
Replies: 73
Views: 1,968
Posted By RChung

For the purposes of hill climbing, weight matters...

For the purposes of hill climbing, weight matters but tire rolling resistance matters a lot, too. Good tires/tubes and proper inflation can be worth a fair bit of weight, and is often cheaper.

...
Forum: Road Cycling
06-01-22, 06:55 PM
Replies: 11
Views: 318
Posted By RChung

That's a good reason.

That's a good reason.
Forum: Road Cycling
06-01-22, 03:21 PM
Replies: 11
Views: 318
Posted By RChung

You know how Stages sold their PM on the idea...

You know how Stages sold their PM on the idea that consistency is all that matters, and everyone who bought one repeats that? If they really believed that, they'd just report the left side and not...
Forum: Road Cycling
06-01-22, 09:09 AM
Replies: 11
Views: 318
Posted By RChung

Would you use a 96% (or maybe 104% -- I don't...

Would you use a 96% (or maybe 104% -- I don't remember which was the one-sided PM) scaling factor to adjust these data?

...
05-09-22, 09:50 AM
Replies: 79
Views: 2,441
Posted By RChung

Actually, if he still has the original raw data...

Actually, if he still has the original raw data and his test protocol is/was robust enough, we can often figure out why the 3-year-old test is different. It's a little bit easier if there were more...
05-09-22, 09:47 AM
Replies: 79
Views: 2,441
Posted By RChung

So, your question is exactly why for so long so...

So, your question is exactly why for so long so few people even tried to do drag estimation. Direction has no effect but wind can definitely screw up the calculations. However, wind affects the aero...
05-09-22, 09:33 AM
Replies: 79
Views: 2,441
Posted By RChung

So, you're mostly right: If Tire A < B in a BRR...

So, you're mostly right: If Tire A < B in a BRR test, very rarely do you find B < A in a road test. That's partly why Ghostrider62's findings are so anomalous, and we're trying to nail down the...
05-08-22, 04:08 PM
Replies: 79
Views: 2,441
Posted By RChung

I wouldn't at all say it's an order of magnitude...

I wouldn't at all say it's an order of magnitude less important. Effect size isn't the same as importance. It's true that at the speeds we normally ride at, for riders of a normal size and weight, a...
05-08-22, 01:15 PM
Replies: 79
Views: 2,441
Posted By RChung

Almost every argument in cycling fora: 1. Only...

Almost every argument in cycling fora:
1. Only the pros need to worry about that. Are you a pro?
2. The best riders are the best because of what they do so just imitate them.
3. Things I can't...
05-08-22, 10:26 AM
Replies: 79
Views: 2,441
Posted By RChung

0.0066 is a lot for those tires. How much has the...

0.0066 is a lot for those tires. How much has the road surface changed? Sometimes I take a photo of the road surface with my phone cam so I can keep track of the surface.

What was the drive train...
04-12-22, 08:10 PM
Replies: 6
Views: 225
Posted By RChung

This is good advice. If your budget is...

This is good advice.

If your budget is really limited and you're unsure if you really want to get into it, you can often find a dumb wheel-on trainer on Craigslist or Ebay for under $50 (or better...
Forum: Road Cycling
04-06-22, 06:30 PM
Replies: 57
Views: 3,128
Posted By RChung

A guy I know once said if you don't see a drop or...

A guy I know once said if you don't see a drop or two of blood on your chamois after the race, you weren't going full out.

I once described to a friend (a different friend, not the one above) what...
Forum: Road Cycling
04-06-22, 04:25 PM
Replies: 57
Views: 3,128
Posted By RChung

I concur, it *can.* More than that, the...

I concur, it *can.* More than that, the correlations we see between swim-bike-run legs of a triathlon and run-bike-run legs of duathlons show that athletes participating in those events appear to...
Forum: Road Cycling
04-05-22, 05:35 PM
Replies: 57
Views: 3,128
Posted By RChung

That's why in that link I said the faster the...

That's why in that link I said the faster the runner, the lower the equivalent distance; the slower the runner the longer the equivalent distance. Just saying "3x distance" is a ballpark. I showed a...
Forum: Road Cycling
04-01-22, 09:52 AM
Replies: 77
Views: 3,025
Posted By RChung

That's a fair thought, although I've always found...

That's a fair thought, although I've always found it tough to work through all the variants in the ways "ough" ought to be pronounced. Just reading that sentence right now made me cough.
Forum: Road Cycling
03-30-22, 09:39 AM
Replies: 77
Views: 3,025
Posted By RChung

My English isn't bad for a non-native speaker,...

My English isn't bad for a non-native speaker, and I understood. Perhaps English *is* your native tongue but you're just bad at it? Making fun of others' speech or writing isn't a good look to...
Forum: Road Cycling
03-29-22, 05:54 PM
Replies: 77
Views: 3,025
Posted By RChung

No. Speed in m/s roughly translates to watts/kg...

No. Speed in m/s roughly translates to watts/kg needed to run that speed. It takes roughly X watts/kg to run X m/s. Runners generally know their pace in terms of minutes per mile, or minutes per km....
Forum: Road Cycling
03-13-22, 08:25 PM
Replies: 38
Views: 1,037
Posted By RChung

I was in a similar situation a year or so ago and...

I was in a similar situation a year or so ago and thought I'd try IpBike ANT+, but then a friend loaned me his old Garmin 500 for a week so I never had to find out if IpBike would have worked.
02-23-22, 03:29 AM
Replies: 25
Views: 830
Posted By RChung

Not always. You may recall the big debates...

Not always. You may recall the big debates several years ago about "flat" vs. "lenticular" disc wheels. I believe that the empirical result was that on a front wheel (such as something you'd use for...
Forum: Road Cycling
02-21-22, 05:20 AM
Replies: 70
Views: 3,090
Posted By RChung

Yes, I do, but I was unhappy when I had to patch...

Yes, I do, but I was unhappy when I had to patch a flat because the patch threw off the balancing, so now when I get a flat I add three patches, one over the hole and two others at 120-degree...
Forum: Recumbent
02-17-22, 01:08 AM
Replies: 71
Views: 6,254
Posted By RChung

Sorry. I'll try to do better.

Sorry. I'll try to do better.
Forum: Recumbent
02-12-22, 02:27 AM
Replies: 71
Views: 6,254
Posted By RChung

BROL had been declining in functionality for a...

BROL had been declining in functionality for a while. That's too bad because there's a lot of knowledge, experience, and data in its archives that are essentially inaccessible.
01-14-22, 02:22 AM
Replies: 48
Views: 1,265
Posted By RChung

Very nice. Just FYI, from a standing start, 10...

Very nice. Just FYI, from a standing start, 10 seconds would put you into pretty elite company. Here are some data from a standing start for a "national-level" master's pursuiter (note the IP is 4000...
01-06-22, 02:04 AM
Replies: 142
Views: 5,206
Posted By RChung

Welcome to BikeForums ! I have three kids,...

Welcome to BikeForums !

I have three kids, the youngest of whom is also 15. When my kids were little and asked, "am I fast?" or "do I hit the ball well?" or "was that good?" my return question was...
12-15-21, 12:37 PM
Replies: 86
Views: 4,464
Posted By RChung

I haven't. I ride when it gets cold but I'm not...

I haven't. I ride when it gets cold but I'm not eager to do much testing when it's cold (there's some standing around recording stuff and making notes) so the range of temperatures I've tested in are...
12-15-21, 06:31 AM
Replies: 86
Views: 4,464
Posted By RChung

"At some point, many of these threads come down...

"At some point, many of these threads come down to some version of 'I don't know how to do a test and I'm a smart guy so you can't possibly know how to do such a test either.'"
12-15-21, 01:07 AM
Replies: 86
Views: 4,464
Posted By RChung

At some point, many of these threads come down to...

At some point, many of these threads come down to some version of "I don't know how to do a test and I'm a smart guy so you can't possibly know how to do such a test either."

We've looked at...
12-14-21, 12:32 AM
Replies: 86
Views: 4,464
Posted By RChung

Watts are watts, but the actual number of watts...

Watts are watts, but the actual number of watts depends on your actual weight and your actual speed; that's why we often compare rolling resistance in terms of a coefficient. Then anyone can multiply...
12-06-21, 12:42 AM
Replies: 86
Views: 4,464
Posted By RChung

The relevant piece is that he discovered it by...

The relevant piece is that he discovered it by doing field tests on the road, not in the lab. Until then, doing high-precision road tests was a huge PITA so no one did them (it's still kind of a...
12-05-21, 10:02 AM
Replies: 86
Views: 4,464
Posted By RChung

That Zinn article isn't bad. Here's a link to...

That Zinn article isn't bad. Here's a link to Tom's original discussion of impedance (https://www.slowtwitch.com/Tech/What_s_in_a_tube__1034.html) (note how he "undertook an experiment 'on the road'...
12-05-21, 04:20 AM
Replies: 86
Views: 4,464
Posted By RChung

Size of contact patch doesn't actually have much...

Size of contact patch doesn't actually have much to do with rolling resistance. Rolling resistance depends much more on frictional losses in other parts of the tire/tube system. It's sort of...
10-29-21, 12:34 PM
Replies: 38
Views: 1,321
Posted By RChung

Hmmm. No, but I know how one could find out.

Hmmm. No, but I know how one could find out.
10-27-21, 03:04 AM
Replies: 84
Views: 3,660
Posted By RChung

Yes.

Yes.
Showing results 1 to 50 of 246
 


 
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