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Search: Posts Made By: HTupolev
Showing results 1 to 50 of 617
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04-02-24, 11:00 PM
Replies: 76
Views: 5,995
Posted By HTupolev

When using tougher materials, thinner and lighter...

When using tougher materials, thinner and lighter doesn't necessarily equate to less rolling resistance, if the material and/or construction introduces more hysteresis.

I haven't seen any data on...
02-27-24, 12:24 PM
Replies: 46
Views: 1,850
Posted By HTupolev

[i] Possibly insufficient tension. As...

[i]
Possibly insufficient tension.

As you're riding, the section of the rim at the contact patch gets flexed upwards a little relative to the hub. This momentarily shortens the spokes that are...
Forum: Road Cycling
02-17-24, 05:13 PM
Replies: 29
Views: 1,973
Posted By HTupolev

This is incorrect. The amount that a...

This is incorrect.

The amount that a derailleur moves laterally for a given amount of cable pull is often referred to as "actuation ratio." All Shimano derailleurs that are 9-speed and below...
02-16-24, 12:48 PM
Replies: 424
Views: 15,889
Posted By HTupolev

Due to the quadratic term, that's not how the...

Due to the quadratic term, that's not how the math shakes out. 20->40 is not the same as 0->20. For the static portion, it's not...
.5*85*(5.55556^2)
...but rather...
.5*85*(11.1111^2 - 5.55556^2)...
Forum: Road Cycling
02-16-24, 02:36 AM
Replies: 17
Views: 1,046
Posted By HTupolev

When the tire is a lot wider than the rim, a lot...

When the tire is a lot wider than the rim, a lot of the tire's "length" is spent curving inwards to the rim, so there's less left over to extend upwards.

Imagine a circle, and then imagine a...
Forum: Road Cycling
02-07-24, 02:31 AM
Replies: 101
Views: 8,442
Posted By HTupolev

You're right, I worded my explanation wrong. But...

You're right, I worded my explanation wrong. But my arithmetic does not make that mistake.

I just edited my post to correct the mistake.
Forum: Road Cycling
01-09-24, 11:59 PM
Replies: 21,461
Views: 5,396,494
Posted By HTupolev

A print of Cycling, Art, Energy and Locomotion,...

A print of Cycling, Art, Energy and Locomotion, originally published 1889.

It's got some gems

https://i.imgur.com/Z4qQag0.jpg
Forum: Road Cycling
01-03-24, 01:11 AM
Replies: 26
Views: 1,292
Posted By HTupolev

Wow!

Wow!
12-09-23, 02:05 AM
Replies: 62
Views: 7,627
Posted By HTupolev

A gravel bike is a bike with a frame made of...

A gravel bike is a bike with a frame made of gravel. Problem solved. Close the thread.
12-03-23, 12:19 AM
Replies: 59
Views: 3,471
Posted By HTupolev

A trivial answer doesn't exist. Increasing...

A trivial answer doesn't exist.

Increasing pressure tends to reduce rolling resistance because it causes you to lose less energy to deformation off the tire.
But.
Increasing pressure can...
10-08-23, 11:58 AM
Replies: 32
Views: 1,247
Posted By HTupolev

Wax's lubricating properties are quite good, and...

Wax's lubricating properties are quite good, and it doesn't break off from a chain as easily as you might think.

On a lubricated drivetrain, a main driver of chain wear is contamination. Oil...
10-07-23, 09:58 PM
Replies: 140
Views: 6,297
Posted By HTupolev

I am shocked that nobody is carrying the...

I am shocked that nobody is carrying the fixed-gear touring bike that you want.
10-04-23, 12:38 AM
Replies: 108
Views: 8,191
Posted By HTupolev

"Boiling" implies that the vapor pressure is...

"Boiling" implies that the vapor pressure is equal to the ambient pressure, i.e. that bubbles can form even in a region of the fluid that is fully surrounded by the liquid. The evaporation that...
09-15-23, 07:30 PM
Replies: 166
Views: 8,111
Posted By HTupolev

They don't need to directly depend on bicycle...

They don't need to directly depend on bicycle mass to have implications on the performance effects of changing bike mass. Total ride effort with respect to various resistance forces is not a linear...
09-15-23, 06:07 PM
Replies: 166
Views: 8,111
Posted By HTupolev

Not only that, but because the descent takes far...

Not only that, but because the descent takes far less time than the climb, the time costs and benefits are even bigger than the difference in the ratios of speed.
09-13-23, 04:52 PM
Replies: 382
Views: 19,727
Posted By HTupolev

The traditional option is to use several rounds...

The traditional option is to use several rounds of white spirits followed by a round of ethanol. This is effective, and the cost-of-entry for the raw material is very cheap, but there's a...
09-13-23, 02:17 PM
Replies: 382
Views: 19,727
Posted By HTupolev

Drip wax is wax suspended in a solvent. Once it's...

Drip wax is wax suspended in a solvent. Once it's applied and the solvent leaves, it's just wax.

Oil lubricants typically include quite a lot of solvent as well. But they stay liquid as the...
Forum: Touring
09-13-23, 01:03 PM
Replies: 67
Views: 4,874
Posted By HTupolev

That's easy. Just route the cabling all the way...

That's easy. Just route the cabling all the way to the handlebar clamp area like you would with brifter cables, rather than exiting below the levers. With modern shift housing it typically works...
Forum: Touring
09-12-23, 09:38 PM
Replies: 67
Views: 4,874
Posted By HTupolev

If you're willing to take the gamble that...

If you're willing to take the gamble that fiddling will be involved, one option is to simply take the dive and coax it into working. Modern chains are pickier with compatibility than the old stuff,...
09-06-23, 10:53 AM
Replies: 382
Views: 19,727
Posted By HTupolev

Controlled testing pretty consistently shows...

Controlled testing pretty consistently shows waxes outperforming oil-based lubricants, for example the work by ZFC (https://zerofrictioncycling.com.au/lubetesting/).
Forum: Road Cycling
09-05-23, 11:20 PM
Replies: 30
Views: 1,856
Posted By HTupolev

Only beach cruisers are mountain bikes. All...

Only beach cruisers are mountain bikes.

All bikes with frames made out of gravel are gravel bikes.
09-03-23, 11:28 PM
Replies: 21
Views: 2,110
Posted By HTupolev

Due to this thread, I decided to finally grab The...

Due to this thread, I decided to finally grab The Bicycle Wheel. In addition to The Data Book and a copy of whatever the book the thread is about is called.

https://i.imgur.com/blG93kd.jpg
08-28-23, 11:27 AM
Replies: 21
Views: 2,110
Posted By HTupolev

The book is about Jobst Brandt, written by...

The book is about Jobst Brandt, written by distinguished author Ride Bike.
08-03-23, 04:56 PM
Replies: 85
Views: 7,491
Posted By HTupolev

Install a 52-50-36-34 crankset. Cover all the...

Install a 52-50-36-34 crankset. Cover all the bases.
07-31-23, 08:34 PM
Replies: 122
Views: 4,613
Posted By HTupolev

This implies that half the shops you've gone into...

This implies that half the shops you've gone into do have a clue about frame geometry, which I'm not sure is a low ratio.
07-28-23, 11:26 AM
Replies: 89
Views: 3,878
Posted By HTupolev

This - and some adjacent subjects, like the...

This - and some adjacent subjects, like the merits or otherwise of 1930s racing derailleurs - is a topic covered by very little publicly available testing, and steeped in folklore. I'm surprised to...
07-25-23, 08:26 AM
Replies: 38
Views: 3,211
Posted By HTupolev

Relevant to the context of this thread. Is...

Relevant to the context of this thread.

Is the goal to have a low-cost lubricant, or for the lubricant to minimize the cost of riding a bike? Lubricants are fairly inexpensive, but decent metal...
Forum: Road Cycling
07-24-23, 09:52 PM
Replies: 3,307
Views: 673,259
Posted By HTupolev

On Wheeler Mountain, overlooking Oso. ...

On Wheeler Mountain, overlooking Oso.

https://i.imgur.com/AbaiV7r.jpg
07-24-23, 02:34 PM
Replies: 17
Views: 840
Posted By HTupolev

If the mechanic got it to work, the 2x10...

If the mechanic got it to work, the 2x10 drivetrain was probably either Tiagra 4700 or GRX400, in which case the Ultegra RX derailleur would be perfectly compatible. They use the same actuation...
Forum: Road Cycling
07-23-23, 05:12 PM
Replies: 57
Views: 4,098
Posted By HTupolev

To me, that can be just as good of an argument...

To me, that can be just as good of an argument for going to an even smaller big ring. If you're able to spend most of the time in the 1-tooth jump area, it can be nice to cross the 15-17 gap less...
07-23-23, 04:25 PM
Replies: 16
Views: 981
Posted By HTupolev

Yes. Movement of air within a pneumatic tire...

Yes. Movement of air within a pneumatic tire costs very little energy. As long as the tire isn't overinflated (i.e. it's able to serve as suspension), the primary contributor to rolling resistance is...
07-20-23, 08:23 PM
Replies: 108
Views: 3,934
Posted By HTupolev

Although some triples have been spec'd as...

Although some triples have been spec'd as expansions on the 52-42 double or similar, that's not how they originated.

When 52-42 and thereabouts rose to prominence in the 1960s, it was wider than...
07-19-23, 02:10 PM
Replies: 108
Views: 3,934
Posted By HTupolev

It's both. On upshifts, if the front derailleur...

It's both.
On upshifts, if the front derailleur were to magically disappear before the chain is meshing with the next ring, the chain would tend to go back to doing what it was doing on the initial...
07-18-23, 12:42 PM
Replies: 108
Views: 3,934
Posted By HTupolev

Besides exposure, the other problem with having...

Besides exposure, the other problem with having the front derailleur below the rings is that you'd need to backpedal to shift. Which people generally don't like.
07-09-23, 07:10 PM
Replies: 27
Views: 2,193
Posted By HTupolev

This is a very common sort of gravel drivetrain...

This is a very common sort of gravel drivetrain in my area. RD-RX400 or RD-RX810 paired to a cassette with a 40+ sprocket on some manner of subcompact double crank.
06-12-23, 12:34 PM
Replies: 63
Views: 9,228
Posted By HTupolev

When there's a "plus" in the name of a tire to...

When there's a "plus" in the name of a tire to indicate extra protection, it's a strong indicator that the tire is sacrificing a large amount of suppleness and performance for the extra durability.
Forum: Road Cycling
06-07-23, 07:01 PM
Replies: 36
Views: 2,326
Posted By HTupolev

This is heavily regional, heavily...

This is heavily regional, heavily rider-dependent, and also heavily dependent on the tire and tire setup. If you install 25mm Marathon Plus tires and pump them to over 100PSI, for example, you'll...
04-01-23, 05:48 PM
Replies: 164
Views: 8,096
Posted By HTupolev

My guess would be that manufacturers are...

My guess would be that manufacturers are providing models at high price points because there are consumers who are interested in buying models at those price points.
03-13-23, 12:57 PM
Replies: 31
Views: 1,239
Posted By HTupolev

Prior to the mass industrial adoption of rubber...

Prior to the mass industrial adoption of rubber products, tires were generally iron or steel.
03-13-23, 12:27 AM
Replies: 53
Views: 3,036
Posted By HTupolev

Cyclist: "What are good 650mmx47cc 26 inch tire...

Cyclist: "What are good 650mmx47cc 26 inch tire options?"
Salesperson: "Our tire sizing system is working as intended to minimize consumer confusion. The typical human is incapable of comprehending...
02-26-23, 06:29 PM
Replies: 65
Views: 3,062
Posted By HTupolev

No, but I might object to some equivocation in...

No, but I might object to some equivocation in how you're leveraging the word "using." Generally when someone "uses" a traditional search engine to assist in constructing a forum post, for example,...
02-24-23, 06:07 PM
Replies: 841
Views: 30,334
Posted By HTupolev

So why aren't you doing so? Why are you posting...

So why aren't you doing so? Why are you posting lists of "sources" where most of the entries don't actually exist?

Current LLM chatbots are not rigorous knowledge engines. GPT-3 contains 175...
02-24-23, 12:02 AM
Replies: 49
Views: 2,790
Posted By HTupolev

Velocity Cliffhanger or Velo Orange Voyager.

Velocity Cliffhanger or Velo Orange Voyager.
02-23-23, 06:28 PM
Replies: 841
Views: 30,334
Posted By HTupolev

I'm not saying that it's a poor analogy because...

I'm not saying that it's a poor analogy because there isn't mathematical equivalence between the things being analogized. I think it's a poor analogy because I don't think that the attributes being...
02-23-23, 12:01 AM
Replies: 841
Views: 30,334
Posted By HTupolev

The person who challenged you was not unaware of...

The person who challenged you was not unaware of the math. They challenged you because they're familiar with the math.


Not really. Newton's work is undeniably a foundation of modern kinematics,...
02-22-23, 04:42 PM
Replies: 841
Views: 30,334
Posted By HTupolev

No you didn't. The answers you gave are fairly...

No you didn't. The answers you gave are fairly meaningless, since they include neither your assumptions nor most of the relevant calculations.

As it happens, the specific answer you offered (10.2J...
02-21-23, 08:47 PM
Replies: 841
Views: 30,334
Posted By HTupolev

The issue isn't that you made it up on the fly....

The issue isn't that you made it up on the fly. It's that you're trying to apply it to a problem in a way that doesn't make sense, even as an analogy.
02-20-23, 10:20 PM
Replies: 841
Views: 30,334
Posted By HTupolev

Gyroscopic effects are just one aspect of a...

Gyroscopic effects are just one aspect of a bicycle's dynamic handling characteristics, and like all the others, not really something that bicycle stability uniquely depends on. Other factors, such...
02-19-23, 03:51 PM
Replies: 841
Views: 30,334
Posted By HTupolev

One of my bikes has two wheelsets that both use...

One of my bikes has two wheelsets that both use box-section clincher rims, but which differ by 600g, with much of the difference in the spokes and rims. The heavier set was dirt cheap, I bought it to...
02-18-23, 07:19 PM
Replies: 341
Views: 17,862
Posted By HTupolev

What terrymorse is getting at is the issue of...

What terrymorse is getting at is the issue of crank inertial load, or perhaps more generally, "what are the physiological consequences to changing how the pedals respond to pedaling force."...
Showing results 1 to 50 of 617
 


 
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