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Search: Posts Made By: RChung
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Forum: Road Cycling
06-24-21, 09:36 AM
Replies: 7
Views: 235
Posted By RChung

So, the important questions are: do you have to...

So, the important questions are: do you have to brake on approaching the turns (probably), how much speed do you lose from that, and how quickly do you accelerate when coming out of each turn. If you...
06-20-21, 07:05 AM
Replies: 93
Views: 1,940
Posted By RChung

Thanks. You should hold on to it--it's a classic....

Thanks. You should hold on to it--it's a classic. Purple is cool.
06-19-21, 10:55 AM
Replies: 93
Views: 1,940
Posted By RChung

Been there, done that. About 20 years ago a...

Been there, done that. About 20 years ago a vicious stick jumped up from the road, attacked, and ripped off my RD. I pulled out my late lamented Ritchey CPR-9 (see below), shortened the chain to a...
Forum: Road Cycling
06-19-21, 06:56 AM
Replies: 8
Views: 328
Posted By RChung

Yup. The best thing is be in perfect position...

Yup. The best thing is be in perfect position with the best helmet that's perfectly matched to that perfect position -- but not everyone can always do that. Roundish helmets can be more "robust" in...
Forum: Road Cycling
06-17-21, 08:42 AM
Replies: 8
Views: 328
Posted By RChung

Depends on your individual body shape. Look for...

Depends on your individual body shape. Look for no wrinkles around the neck/shoulders when you're in riding position, tight sleeves that go down close to the elbow, and that doesn't bunch up along...
Forum: Road Cycling
06-16-21, 09:40 AM
Replies: 14
Views: 508
Posted By RChung

Congratulations on meeting your goal. To be...

Congratulations on meeting your goal.

To be 10 minutes faster on the same route with the same weather conditions would require just about 10% more power.
Forum: Road Cycling
06-15-21, 01:15 PM
Replies: 36
Views: 1,105
Posted By RChung

A woman I know says her ex put them on her bike...

A woman I know says her ex put them on her bike when she went to pick up her stuff.
06-10-21, 08:07 PM
Replies: 110
Views: 3,077
Posted By RChung

Sometimes, yup.

Sometimes, yup.
06-10-21, 05:59 PM
Replies: 110
Views: 3,077
Posted By RChung

One person's bug is another person's opportunity.

One person's bug is another person's opportunity.
06-10-21, 10:14 AM
Replies: 110
Views: 3,077
Posted By RChung

A few weeks ago Jan Heine had a post on his blog...

A few weeks ago Jan Heine had a post on his blog about the aero drag of handlebar bags. He was using max speed while coasting down a big hill to determine that. We were curious about that and asked...
Forum: Road Cycling
06-02-21, 08:12 PM
Replies: 62
Views: 3,450
Posted By RChung

I bought a Przewalski bib for $25, and I thought...

I bought a Przewalski bib for $25, and I thought it was easily worth $35.
Forum: Road Cycling
05-31-21, 10:46 PM
Replies: 71
Views: 1,874
Posted By RChung

Yeah, some of his ideas are intriguing--what's...

Yeah, some of his ideas are intriguing--what's hard is figuring out the magnitude of the effects he's proposed.

Here's Josh Poertner's take on Hambini's wind tunnel protocol (Damon Rinard's take...
Forum: Road Cycling
05-31-21, 10:23 PM
Replies: 71
Views: 1,874
Posted By RChung

So, I've done this but it's kind of a pain in the...

So, I've done this but it's kind of a pain in the butt to do. Basically, you substitute one drag parameter then you go back to the original data and using the new parameter but the original power and...
Forum: Road Cycling
05-31-21, 06:06 PM
Replies: 71
Views: 1,874
Posted By RChung

WhyFi was being facetious. And to be fair, Coggan...

WhyFi was being facetious. And to be fair, Coggan wasn't the only one with doubts -- I had doubts about it for quite a while, too. Hmmm. Sometimes now.


Ugh. I've said this elsewhere: sometimes...
Forum: Road Cycling
05-31-21, 05:12 PM
Replies: 71
Views: 1,874
Posted By RChung

Andy Coggan called it something like "borderline...

Andy Coggan called it something like "borderline academic fraud" so there's that.
Forum: Road Cycling
05-31-21, 05:11 PM
Replies: 71
Views: 1,874
Posted By RChung

That appears to be the case, mostly. That is, if...

That appears to be the case, mostly. That is, if Crr for Tire A < Crr for Tire B on the drum, almost always Crr(A) < Crr(B) on the road for close to comparable surfaces. There may be some cases where...
Forum: Road Cycling
05-31-21, 05:05 PM
Replies: 71
Views: 1,874
Posted By RChung

Is that a M5 CHR?

Is that a M5 CHR?
Forum: Road Cycling
05-31-21, 09:48 AM
Replies: 71
Views: 1,874
Posted By RChung

If only there were some way to measure actual Crr...

If only there were some way to measure actual Crr on real roads.
Forum: Road Cycling
05-26-21, 04:25 PM
Replies: 79
Views: 2,219
Posted By RChung

Here's my standard advice to new users of power...

Here's my standard advice to new users of power meters. (https://www.bikeforums.net/training-nutrition/1051004-just-got-power-meter-help.html#post18611150)
Forum: Road Cycling
05-24-21, 11:10 AM
Replies: 79
Views: 2,219
Posted By RChung

I suppose it's a possibility, but a lot depends...

I suppose it's a possibility, but a lot depends on why your left is weaker: some things may be correctable, others may not be. I have a friend who's a cycling coach, pretty well known, who had to...
Forum: Road Cycling
05-24-21, 08:06 AM
Replies: 79
Views: 2,219
Posted By RChung

The problem is with the right side crank, not the...

The problem is with the right side crank, not the left -- more precisely, the problem is with the right side Shimano DuraAce, Ultegra, and 105 cranks. More more precisely, it's with putting a strain...
Forum: Road Cycling
05-23-21, 02:26 PM
Replies: 20
Views: 16,836
Posted By RChung

VO2Max measurement pre-dates power meters, and is...

VO2Max measurement pre-dates power meters, and is a summary measure of overall aerobic production of energy that could be measured without getting into the weeds of exactly how that energy was...
Forum: Road Cycling
05-23-21, 01:55 PM
Replies: 79
Views: 2,219
Posted By RChung

Oh, so you *do* care about accuracy, and not just...

Oh, so you *do* care about accuracy, and not just precision.
Forum: Road Cycling
05-23-21, 09:14 AM
Replies: 79
Views: 2,219
Posted By RChung

You know what's precise? A wristwatch. You'll get...

You know what's precise? A wristwatch. You'll get very precise numbers over time, and it's a lot cheaper than a power meter.
Forum: Road Cycling
05-23-21, 08:28 AM
Replies: 79
Views: 2,219
Posted By RChung

You're reading that correctly. To be fair,...

You're reading that correctly.

To be fair, back when that study was done, I think the Stages may have been the only power meter in that study that was left-side only, so another way to look at...
Forum: Road Cycling
05-22-21, 10:31 PM
Replies: 79
Views: 2,219
Posted By RChung

This is from here...

This is from here (https://pubmed.ncbi.nlm.nih.gov/28482367/), which was a 2017 check on power meters out in the hands of actual riders. Since this was done a few years ago, there weren't many pedal...
Forum: Road Cycling
05-22-21, 05:13 PM
Replies: 11
Views: 668
Posted By RChung

Rest in peace.

Rest in peace.
Forum: Road Cycling
05-22-21, 04:36 PM
Replies: 79
Views: 2,219
Posted By RChung

Well, it makes me feel even better about my...

Well, it makes me feel even better about my purchase. It wasn't just a bare hub but came in a wheel, and I did a static torque check to validate that it's working properly. I still use rim brakes and...
Forum: Road Cycling
05-22-21, 04:13 PM
Replies: 79
Views: 2,219
Posted By RChung

If you have the same BB on different bikes (not...

If you have the same BB on different bikes (not everyone does), swapping crank spiders can be faster than swapping pedals.
Forum: Road Cycling
05-22-21, 02:56 PM
Replies: 79
Views: 2,219
Posted By RChung

It really depends on what you hope to do with the...

It really depends on what you hope to do with the data. For many purposes, single-sided is fine; for a few, it isn't. I happen to do some of those things, so I need as much accuracy (not just...
Forum: Road Cycling
05-22-21, 02:34 PM
Replies: 79
Views: 2,219
Posted By RChung

The issue is with the asymmetrical 4-arm right...

The issue is with the asymmetrical 4-arm right side cranks, so that means Shimano's current 105, Ultegra, and DuraAce cranks. It doesn't apply to the older 5-arm cranks.
Forum: Road Cycling
05-22-21, 10:53 AM
Replies: 79
Views: 2,219
Posted By RChung

With the 105 group, I wouldn't bother going to a...

With the 105 group, I wouldn't bother going to a dual-sided in the future. There are known issues with instrumenting the right side crank arm for that design. If you're set on a left-side crank arm,...
05-18-21, 10:07 PM
Replies: 18
Views: 1,022
Posted By RChung

He spends a lot of time doing volunteer work at a...

He spends a lot of time doing volunteer work at a local food bank. I'd say that's pretty important.
Forum: Road Cycling
05-17-21, 09:26 PM
Replies: 40
Views: 1,499
Posted By RChung

Yup. W/kg tells you something about your...

Yup. W/kg tells you something about your potential to go fast on climbs. Anhalts tell you something about your potential to go fast on the flat. Tom Anhalt was way underpowered compared to many of...
Forum: Road Cycling
05-17-21, 04:16 PM
Replies: 40
Views: 1,499
Posted By RChung

Sometimes the things we display on a head unit in...

Sometimes the things we display on a head unit in real time aren't what we would want to know about after the ride.

That said, I was just talking with some people a couple of weeks ago about what...
Forum: Road Cycling
05-16-21, 10:15 AM
Replies: 148
Views: 5,467
Posted By RChung

Oh, those models exist--I worked on one about a...

Oh, those models exist--I worked on one about a decade ago, and reviewed another one this last year. In both of those cases we were focused on track pursuit where times are recorded to the...
Forum: Road Cycling
05-15-21, 12:41 PM
Replies: 40
Views: 1,499
Posted By RChung

Not much, which is kind of interesting--pedals...

Not much, which is kind of interesting--pedals are a "noisier" platform, which is why pedal-based power meters took much longer to come to the market. The crank can also be noisy (especially the...
Forum: Road Cycling
05-15-21, 07:54 AM
Replies: 40
Views: 1,499
Posted By RChung

I think that's pretty important. I use power to...

I think that's pretty important. I use power to calibrate RPE, and RPE to modulate power.


Yes. That's often quite helpful. I've been saying that some uses of power data are more dependent on...
Forum: Road Cycling
05-14-21, 09:57 PM
Replies: 40
Views: 1,499
Posted By RChung

That's the right idea, but not quite the right...

That's the right idea, but not quite the right calculation. The "equivalent" steady state power in your example would be 85% of FTP and the training stress would be 146.

Also, Strava doesn't quite...
Forum: Road Cycling
05-14-21, 05:43 PM
Replies: 40
Views: 1,499
Posted By RChung

Makes sense to me. The algorithm is based...

Makes sense to me. The algorithm is based (mostly) on the Lp vector norm (where p=4).
Forum: Road Cycling
05-14-21, 01:07 PM
Replies: 40
Views: 1,499
Posted By RChung

Not everyone needs (or wants) to do the things I...

Not everyone needs (or wants) to do the things I do, so not everyone needs the same degree of data fidelity. However, the key is to match your needs and expectations to what the device is capable of...
Forum: Road Cycling
05-14-21, 12:06 PM
Replies: 40
Views: 1,499
Posted By RChung

Here's my advice to riders new to using power...

Here's my advice to riders new to using power (https://www.bikeforums.net/training-nutrition/1051004-just-got-power-meter-help-post18611150.html?post18611150).
Forum: Road Cycling
05-14-21, 12:00 PM
Replies: 40
Views: 1,499
Posted By RChung

If you're getting into TT, you'll probably...

If you're getting into TT, you'll probably eventually get into thinking about drag estimation. People used to ask me to help them with that. It didn't really take that long for me to ask, "what power...
05-10-21, 08:52 PM
Replies: 18
Views: 1,022
Posted By RChung

It was pretty hot so he quit after Everesting in...

It was pretty hot so he quit after Everesting in 9 hours.
Forum: Road Cycling
05-04-21, 12:03 AM
Replies: 27
Views: 1,289
Posted By RChung

Oh dear.

Oh dear.
Forum: Road Cycling
05-03-21, 06:18 PM
Replies: 27
Views: 1,289
Posted By RChung

I'm glad I still have the ability to surprise,...

I'm glad I still have the ability to surprise, ocasionally.

Astrophysicists don't get to do experimental control on stars or galaxies. Seismologists don't get to randomly assign earthquakes and...
Forum: Road Cycling
05-03-21, 02:43 PM
Replies: 27
Views: 1,289
Posted By RChung

Oh dear.

Oh dear.
Forum: Road Cycling
05-03-21, 01:51 PM
Replies: 27
Views: 1,289
Posted By RChung

Not everything has to be controlled, as long as...

Not everything has to be controlled, as long as you can measure them and know how to account for them. That is, you don't have to do experimental control if you can collect what you need to do...
Forum: Road Cycling
05-02-21, 09:34 AM
Replies: 69
Views: 2,864
Posted By RChung

Thanks. I'd missed that thread. So, standing...

Thanks. I'd missed that thread. So, standing costs you both in Crr and CdA ... but sometimes you have no other choice and you have to stand. Just try to train and get the right gearing so you still...
Forum: Road Cycling
05-01-21, 06:41 PM
Replies: 69
Views: 2,864
Posted By RChung

I'm not as sceptical as some of you that Crr is...

I'm not as sceptical as some of you that Crr is constant with rider position. I think it at least possible. That said, I have 3 questions:
1. If this effect occurs, how large is it?
2. If this...
Showing results 1 to 50 of 1000
 


 
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