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Search: Posts Made By: Kapusta
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08-07-20, 08:58 PM
Replies: 179
Views: 7,364
Posted By Kapusta

I agree.

I agree.
08-07-20, 04:29 PM
Replies: 179
Views: 7,364
Posted By Kapusta

It would appear that The Transportation Research...

It would appear that The Transportation Research Board of the National Academies of Science, Engineering and Medicine did not get your memo:
Coefficient of Friction Between Tires and Road Surfaces...
08-07-20, 05:06 AM
Replies: 15
Views: 251
Posted By Kapusta

Those cranks use a 9/16” pedal thread. 9/16”...

Those cranks use a 9/16” pedal thread. 9/16” thread is the modern standard, and most pedals out there these days are that size.

Pedals are one of the few things that component manufacturers have...
08-05-20, 11:51 AM
Replies: 179
Views: 7,364
Posted By Kapusta

You are correct, it is based on empirical...

You are correct, it is based on empirical observation..... such as a tire on a road. That is my whole point.

And when you talk about "eliminating" extraneous factors, what that really means is...
08-05-20, 09:19 AM
Replies: 179
Views: 7,364
Posted By Kapusta

No that is NOT correct. I was suggesting that...

No that is NOT correct. I was suggesting that somewhat sarcastically to point out the flaw in your assertion.

I believe you are making arbitrary distinctions (and ultimately meaningless ones in...
08-04-20, 10:05 PM
Replies: 3
Views: 131
Posted By Kapusta

I see no pictures.

I see no pictures.
08-04-20, 05:57 PM
Replies: 86
Views: 2,222
Posted By Kapusta

It is nuts that you only have one mountain bike...

It is nuts that you only have one mountain bike and no gravel bikes.
08-04-20, 03:27 PM
Replies: 179
Views: 7,364
Posted By Kapusta

Tread deformation does not count? I am...

Tread deformation does not count?

I am curious how you would meaningfully measure the coefficient of friction of a soft rubber on pavement, then, if the micro-deformations of the soft compound...
08-04-20, 02:11 PM
Replies: 179
Views: 7,364
Posted By Kapusta

I am pretty sure “coefficient of friction”...

I am pretty sure “coefficient of friction” encompasses all aspects of how much force it takes to slide one surface against another at any given moment.
08-04-20, 12:03 PM
Replies: 179
Views: 7,364
Posted By Kapusta

I think he is technically correct thaf the...

I think he is technically correct thaf the coefficient of friction does not necessarily increase with contact area. And that might be the end of the story if you are on a very smooth surface.

But...
08-04-20, 07:54 AM
Replies: 17
Views: 415
Posted By Kapusta

Raise the bars so that the drops are more usable?...

Raise the bars so that the drops are more usable? If you are not comfortable in your drops for very long, your bars are probably too low.

Also, if you concentrate on bending at the hips (tilt your...
08-04-20, 06:27 AM
Replies: 179
Views: 7,364
Posted By Kapusta

The difference between the bicycle industry’s...

The difference between the bicycle industry’s myopic obsession with pro road bike racing and athletic footwear companies’ affiliation with professional basketball is that the latter did not result in...
08-03-20, 09:39 AM
Replies: 10
Views: 360
Posted By Kapusta

It kind of cracks me up that something as...

It kind of cracks me up that something as forgiving as the high limit of a tube is specified to 3 decimal places.
08-02-20, 08:43 PM
Replies: 68
Views: 3,081
Posted By Kapusta

Yes. In the case of bikes being built for...

Yes. In the case of bikes being built for anything but pro racing, it probably helps.
08-02-20, 08:30 PM
Replies: 10
Views: 360
Posted By Kapusta

That pop would be normal and is what you guessed...

That pop would be normal and is what you guessed it was.

A deafening boom would be something different.

As far as sizing the tube.... go by the size of the actual tire, not the tube that was in...
08-01-20, 06:50 PM
Replies: 11
Views: 359
Posted By Kapusta

Frames are designed with wheel size in mind. So...

Frames are designed with wheel size in mind. So the bottom bracket can be height whatever the designer wants is to be.

Two things to look at to know how easy it will be to put a foot down while...
08-01-20, 05:03 PM
08-01-20, 01:46 PM
Replies: 11
Views: 359
Posted By Kapusta

Trailer might be the ticket: ...

Trailer might be the ticket:
https://youtu.be/jj0CmnxuTaQ
08-01-20, 07:50 AM
Replies: 11
Views: 359
Posted By Kapusta

Whatever bike recs you are seeing out there are...

Whatever bike recs you are seeing out there are probably not envisioning a 3-year-old on the top tube.
08-01-20, 07:41 AM
Replies: 57
Views: 2,046
Posted By Kapusta

When I lived in an apartment with a similar...

When I lived in an apartment with a similar situation, before coming inside I’d knock of the big chunks that might come loose on the way in, then put something down on the floor under the bike where...
07-31-20, 10:01 AM
Replies: 5
Views: 193
Posted By Kapusta

I don’t understand what this means. Is there...

I don’t understand what this means. Is there still a question?
07-30-20, 02:10 PM
Replies: 5
Views: 193
Posted By Kapusta

No, that is not true. I’ve never even heard that...

No, that is not true. I’ve never even heard that one.

People try different size tires all the time.

The only issue you’ll run into is if your rims are too narrow to be running a 2.6. The tire...
07-30-20, 06:55 AM
Replies: 29
Views: 823
Posted By Kapusta

I though bents were the bottom rung of cycling...

I though bents were the bottom rung of cycling cred..... until now :D
07-30-20, 06:49 AM
Replies: 59
Views: 1,912
Posted By Kapusta

I believe the reason many pedals come without...

I believe the reason many pedals come without reflectors (and don’t have mounts either) has to do with the shape. Most clip-less are too small and even a lot of nicer flats are shaped in ways that...
07-30-20, 05:45 AM
Replies: 8
Views: 240
Posted By Kapusta

Are you removing the valve core before trying to...

Are you removing the valve core before trying to seat the tires?

You need a lot of air flow and the valve core slows it down a lot.
07-29-20, 09:08 PM
Replies: 59
Views: 1,912
Posted By Kapusta

Having driven behind cyclists with pedal...

Having driven behind cyclists with pedal reflectors, I would emphatically disagree that they are ineffective.

They do not replace a light, but the fact that they are moving up and down make them...
07-29-20, 08:41 PM
Replies: 29
Views: 823
Posted By Kapusta

You don't need to explain yourself to that guy....

You don't need to explain yourself to that guy. He's just trying to push your buttons.
07-29-20, 07:56 PM
Replies: 179
Views: 7,364
Posted By Kapusta

Huh? What is it I am trying to peddle? And what...

Huh? What is it I am trying to peddle? And what on Earth is your crucifixion analogy referring to?

You need to be careful when responding on behalf of another forum poster. Your explanation has...
07-27-20, 02:19 PM
Replies: 38
Views: 862
Posted By Kapusta

What is the baseline comparison, here? Wind...

What is the baseline comparison, here?

Wind tunnel positioning.... compared to what? In the drops, on the hoods or bolt upright?

TT suit compared to..... what?
07-27-20, 09:55 AM
Replies: 179
Views: 7,364
Posted By Kapusta

To be fair, front and rear suspension really were...

To be fair, front and rear suspension really were game changers. At least once they get them sorted out.

But yeah, plenty of other things... not so much.
07-27-20, 07:51 AM
Replies: 17
Views: 364
Posted By Kapusta

Ignore the haters. The most important aspect of...

Ignore the haters. The most important aspect of any type of excersise equipment is that you want to use it.

If you think you will use it, get it.

We got an F80 about 10 years ago, It has been...
07-27-20, 07:46 AM
Replies: 17
Views: 364
Posted By Kapusta

Interesting use of bold font.

Interesting use of bold font.
07-27-20, 07:32 AM
Replies: 38
Views: 862
Posted By Kapusta

I never though much about aero. Then one day...

I never though much about aero.

Then one day I tried closing my ubrella for part of the ride and it made a difference.
07-27-20, 06:43 AM
Replies: 179
Views: 7,364
Posted By Kapusta

Is there a point here? in response to my...

Is there a point here?

in response to my pointing out issues with drum roller testing, you posted a chart showing how drastically drum roller test results differ from those on pavement. Were you...
07-26-20, 03:44 PM
Replies: 39
Views: 1,106
Posted By Kapusta

No, Much of this discussion is subjective. This...

No,
Much of this discussion is subjective. This point is not. The size of the tire patch is a function of tire pressure, NOT tire volume. For a given load, two tires of different sizes at the same...
07-26-20, 07:21 AM
Replies: 39
Views: 1,106
Posted By Kapusta

Because the lower pressure gives you better...

Because the lower pressure gives you better comfort, traction, and control on rough surfaces, such as what the OP is describing. Also more control and traction on loose stuff.

It is what is...
07-25-20, 05:52 PM
Replies: 179
Views: 7,364
Posted By Kapusta

He spec’ed them. That is critical. Had he not...

He spec’ed them. That is critical. Had he not done that, those kind of tires would not have come to market. Its not like Panaracer was already making them (they were not).

The fact that he does...
07-25-20, 05:02 PM
Replies: 9
Views: 426
Posted By Kapusta

Website says 1.8” tires max. Back in tje 90s...

Website says 1.8” tires max.

Back in tje 90s many folks were riding 1.8-2.0 tires on single track, so its not like you can’t do it.

But it kicked our asses and we crashed a lot.
07-25-20, 04:17 PM
Replies: 39
Views: 1,106
Posted By Kapusta

Yes, there is a lower limit... and the larger the...

Yes, there is a lower limit... and the larger the tire, the lower that limit is. Thus, as a I said, the larger tire alows lower pressure.

As far as rolling resistance.... Sure, if you drop it too...
07-25-20, 02:38 PM
Replies: 39
Views: 1,106
Posted By Kapusta

Well you’re certainly entitled to your opinion as...

Well you’re certainly entitled to your opinion as much as anybody else, but I disagree.

In my experience, going bigger without lowering the pressure on the road provides marginal benefit.

The...
07-25-20, 07:19 AM
Replies: 39
Views: 1,106
Posted By Kapusta

Yes, at high speeds if you eliminate all contact...

Yes, at high speeds if you eliminate all contact with the saddle it can feel a bit less stable. When I lift my weight off the saddle in this situation, the saddle is still braced against one or both...
07-24-20, 09:21 PM
Replies: 39
Views: 1,106
Posted By Kapusta

Mostly because you can run your pressure lower.

Mostly because you can run your pressure lower.
07-24-20, 06:43 AM
Replies: 39
Views: 1,106
Posted By Kapusta

That is not mental failing, that is simply good...

That is not mental failing, that is simply good risk/benefit analysis. Crashing at 50 mph may well have life-changing consequences so the benefits better be good, such as REALLY enjoying it (which...
07-24-20, 06:04 AM
Replies: 39
Views: 1,106
Posted By Kapusta

Riding on those lane divider bumps is a bad...

Riding on those lane divider bumps is a bad idea, and a terrible place to be braking.

You sould almost never be “riding the brakes”. Brake harder when conditions are good (going straight, smooth...
07-23-20, 08:11 PM
Replies: 179
Views: 7,364
Posted By Kapusta

Real world testing yields messy, less-than...

Real world testing yields messy, less-than consistent and somewhat subjective data, but it is describing the EXACT thing we are most interested in.

Roller Drum tests yield precise, quantifiable,...
07-23-20, 12:41 PM
Replies: 179
Views: 7,364
Posted By Kapusta

Drum testing is the gold standard for determining...

Drum testing is the gold standard for determining how well tires roll on indoor rollers.
07-23-20, 12:37 PM
Replies: 179
Views: 7,364
Posted By Kapusta

It tells us which is more-er better.

It tells us which is more-er better.
07-23-20, 09:47 AM
Replies: 179
Views: 7,364
Posted By Kapusta

Earning a PhD implies that you (under the...

Earning a PhD implies that you (under the guidance of a mentor) have shown expertise in the very specific field/topic in which you did research. Along with the topical knowledge of that very specific...
07-23-20, 07:05 AM
Replies: 179
Views: 7,364
Posted By Kapusta

I read that article, and it seems a bit thin and...

I read that article, and it seems a bit thin and overly specific to me.

What really caught my attention is that he used off-road vehicles to make his point, but if you look at off-road BIKES, it...
07-22-20, 01:37 PM
Replies: 52
Views: 2,099
Posted By Kapusta

Yes. It goes well with my oiled canvas handlebar...

Yes. It goes well with my oiled canvas handlebar bag and wool knickers. :)
Showing results 1 to 50 of 1000
 


 
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