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Search: Posts Made By: HTupolev
Showing results 1 to 50 of 1000
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Forum: Road Cycling
04-05-24, 01:14 PM
Replies: 102
Views: 14,624
Posted By HTupolev

If you mount it on the front rim, absolutely! ...

If you mount it on the front rim, absolutely!


Even if we're talking about performance rather than feel, "99%" is a very optimistic guess for the tires. GP5000 are a lot faster than Gators, but...
Forum: Road Cycling
04-05-24, 12:38 AM
Replies: 102
Views: 14,624
Posted By HTupolev

Not necessarily. Rolling resistance is likely to...

Not necessarily. Rolling resistance is likely to be responsible for much larger performance differences, but if someone is "feeling" something, it wouldn't be surprising if it predominantly arises...
Forum: General Cycling Discussion
04-02-24, 11:00 PM
Replies: 65
Views: 2,673
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...
Forum: General Cycling Discussion
04-02-24, 01:59 AM
Replies: 65
Views: 2,673
Posted By HTupolev

The main caveat with tire liners (and protection...

The main caveat with tire liners (and protection belts integrated beneath the tread of a tire) isn't the weight, its the rolling resistance.
Forum: General Cycling Discussion
02-27-24, 02:10 PM
Replies: 61
Views: 1,929
Posted By HTupolev

Quantifying the ergonomic load of shifting by...

Quantifying the ergonomic load of shifting by counting total gear steps between the ends of a setup sounds like a joke someone would make about meeting Robert McNamara on a bike ride.
Forum: Bicycle Mechanics
02-27-24, 12:24 PM
Replies: 46
Views: 1,349
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: 1,404
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...
Forum: General Cycling Discussion
02-16-24, 12:48 PM
Replies: 424
Views: 13,203
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: 663
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: 7,492
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
02-07-24, 01:41 AM
Replies: 101
Views: 7,492
Posted By HTupolev

Could you show the math? I'm electrical and not...

Could you show the math? I'm electrical and not mech, so it's very possible that I have this totally wrong, but: some of this seems to linearize quite a bit when the wall thickness is small relative...
Forum: Road Cycling
02-06-24, 06:56 PM
Replies: 101
Views: 7,492
Posted By HTupolev

Given the same weight and outer diameter, tube...

Given the same weight and outer diameter, tube stiffness is almost identical between aluminum and steel.

The high stiffness of aluminum tubes is achieved by giving them larger diameters than...
Forum: General Cycling Discussion
02-06-24, 12:35 PM
Replies: 480
Views: 20,276
Posted By HTupolev

Nah, that's the one thing that downtube shifters...

Nah, that's the one thing that downtube shifters are pretty good at, since the ergonomic cost of double-shifting isn't much different from that of single-shifting.


Quickly getting through a...
Forum: General Cycling Discussion
02-05-24, 05:17 PM
Replies: 480
Views: 20,276
Posted By HTupolev

No, but the shifting ergonomics usually aren't as...

No, but the shifting ergonomics usually aren't as good from the drops. When doing complex shifts (like a front shift with a lot of compensatory rear shifting), I'll sometimes put one or both hands on...
Forum: General Cycling Discussion
02-05-24, 04:20 PM
Replies: 480
Views: 20,276
Posted By HTupolev

On an older road bike with non-aero brake levers,...

On an older road bike with non-aero brake levers, it often makes sense to fit it so that the drops are a primary cruising position. Whereas modern hoods are designed as handrests, those hoods are...
Forum: Road Cycling
01-09-24, 11:59 PM
Replies: 21,328
Views: 5,182,471
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: 947
Posted By HTupolev

Wow!

Wow!
Forum: Cyclocross and Gravelbiking (Recreational)
12-09-23, 02:05 AM
Replies: 62
Views: 6,543
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.
Forum: General Cycling Discussion
12-03-23, 12:19 AM
Replies: 59
Views: 2,913
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...
Forum: Cyclocross and Gravelbiking (Recreational)
11-05-23, 08:23 PM
Replies: 11
Views: 1,031
Posted By HTupolev

Same mold doesn't imply that the material stackup...

Same mold doesn't imply that the material stackup hasn't changed. Generally an inflatable bladder is used to press the tire against the mold, so slight changes to the profile of the material being...
Forum: Road Cycling
11-02-23, 01:03 AM
Replies: 18
Views: 1,101
Posted By HTupolev

There's no front shifting, and to my...

There's no front shifting, and to my understanding, SunRace downtube rear shifters are typically indexed-only. So there's probably no friction shifter on that bike.
Forum: Road Cycling
10-29-23, 12:19 PM
Replies: 19
Views: 1,665
Posted By HTupolev

Unfortunately, while a "110/74" triple like that...

Unfortunately, while a "110/74" triple like that would normally be quite versatile, the Tiagra 4703 uses a special asymmetric bolt circle. You can't stick just any 74BCD ring with the correct number...
Forum: Road Cycling
10-28-23, 02:16 PM
Replies: 19
Views: 1,665
Posted By HTupolev

Unfortunately road doubles that small aren't...

Unfortunately road doubles that small aren't common. Personally I think they should be, because there are a lot of riders for which it serves as an effective 1x-plus-granny arrangement.
And the...
Forum: General Cycling Discussion
10-17-23, 02:12 AM
Replies: 52
Views: 2,104
Posted By HTupolev

Body builders often deliberately force themselves...

Body builders often deliberately force themselves into catastrophic dehydration and other sorts of malnourishment, so it doesn't surprise me that one would be exhausted after trying to race a bicycle...
Forum: Bicycle Mechanics
10-11-23, 09:45 PM
Replies: 84
Views: 4,314
Posted By HTupolev

Yes. They specify minimum chainstay length,...

Yes. They specify minimum chainstay length, because allowing shorter means having to tolerate more and more oblique angles. It's geometrically simpler to tolerate unconstrained long chainstays,...
Forum: Bicycle Mechanics
10-11-23, 06:47 PM
Replies: 84
Views: 4,314
Posted By HTupolev

No, because in order to absolutely guarantee that...

No, because in order to absolutely guarantee that rub does happen in specific combos, the drivetrain manufacturers would have to put some very odd over-specifications in place. Such as having strict...
Forum: Classic & Vintage
10-08-23, 11:58 AM
Replies: 32
Views: 1,067
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...
Forum: General Cycling Discussion
10-07-23, 09:58 PM
Replies: 140
Views: 5,303
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.
Forum: Bicycle Mechanics
10-06-23, 01:12 PM
Replies: 107
Views: 6,732
Posted By HTupolev

Maybe. "Condensation" can refer pretty generally...

Maybe. "Condensation" can refer pretty generally to gas-to-liquid phase transitions, whereas boiling is a specific sort of liquid-to-gas phenomenon. "Condensation" is a somewhat obvious answer to the...
Forum: Bicycle Mechanics
10-04-23, 12:38 AM
Replies: 107
Views: 6,732
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...
Forum: General Cycling Discussion
09-20-23, 05:51 PM
Replies: 212
Views: 7,256
Posted By HTupolev

It depends on basically everything. A 2x that...

It depends on basically everything. A 2x that leaves one rider "between rings" might instead function nicely as a "1x-plus-granny" for a different rider, even on the same routes.

As you alluded...
Forum: Classic & Vintage
09-19-23, 01:20 PM
Replies: 159
Views: 6,776
Posted By HTupolev

A sundial is a totally different sort of device....

A sundial is a totally different sort of device. It doesn't track time, it measures local solar time, so even a hypothetical "perfect" sundial would be useless for things like marine chronometry.
Forum: Classic & Vintage
09-17-23, 10:31 PM
Replies: 159
Views: 6,776
Posted By HTupolev

Is it still able to keep time well when all of...

Is it still able to keep time well when all of the cellular networks and GPS satellites are down?
Forum: General Cycling Discussion
09-15-23, 07:30 PM
Replies: 166
Views: 6,758
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...
Forum: General Cycling Discussion
09-15-23, 06:07 PM
Replies: 166
Views: 6,758
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.
Forum: General Cycling Discussion
09-15-23, 03:00 PM
Replies: 382
Views: 16,767
Posted By HTupolev

A sloppier outer surface just means the chain...

A sloppier outer surface just means the chain will pick up contamination faster. The oil itself lubricates fine whether it's just been applied or has sat around for a couple days.
Forum: Cyclocross and Gravelbiking (Recreational)
09-14-23, 12:58 PM
Replies: 34
Views: 1,733
Posted By HTupolev

Negative reach. If the gnarliness demands a big...

Negative reach. If the gnarliness demands a big front-center, and you don't want trail super high because you're intending to use handlebars that aren't super wide, and those bars have primary...
Forum: Cyclocross and Gravelbiking (Recreational)
09-14-23, 12:07 PM
Replies: 34
Views: 1,733
Posted By HTupolev

It feels to me like one of the biggest problems...

It feels to me like one of the biggest problems for gnarly drop-bar bikes is bicycle designers terrified of negative stem.
Forum: Touring
09-13-23, 05:03 PM
Replies: 67
Views: 3,784
Posted By HTupolev

In the context of bar-end rear shifting on a...

In the context of bar-end rear shifting on a modern drivetrain, one reason to go friction is that it often requires less force to get the shifter to move. Sometimes this means that you can do...
Forum: General Cycling Discussion
09-13-23, 04:52 PM
Replies: 382
Views: 16,767
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...
Forum: General Cycling Discussion
09-13-23, 02:17 PM
Replies: 382
Views: 16,767
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: 3,784
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: 3,784
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,...
Forum: Cyclocross and Gravelbiking (Recreational)
09-11-23, 02:44 PM
Replies: 4
Views: 486
Posted By HTupolev

If you're going to be dealing with mud or wet...

If you're going to be dealing with mud or wet foliage or other stuff where some knobs are going to make a big difference, the K161 isn't a bad choice. For gravel which is mostly dry aggregate, and...
Forum: Cyclocross and Gravelbiking (Recreational)
09-10-23, 08:36 PM
Replies: 7
Views: 753
Posted By HTupolev

Not really. Most of what the rider has to deal...

Not really. Most of what the rider has to deal with it stuff that's low-frequency for the tires to filter out, so heavier just means more mass for you to wrangle.

It's often worth paying a price...
Forum: General Cycling Discussion
09-06-23, 10:53 AM
Replies: 382
Views: 16,767
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: 1,398
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.
Forum: Classic & Vintage
09-03-23, 11:28 PM
Replies: 21
Views: 1,868
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
Forum: Classic & Vintage
08-28-23, 11:27 AM
Replies: 21
Views: 1,868
Posted By HTupolev

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

The book is about Jobst Brandt, written by distinguished author Ride Bike.
Forum: General Cycling Discussion
08-27-23, 04:48 PM
Replies: 29
Views: 970
Posted By HTupolev

What are you using as rim strip and tape? Why are...

What are you using as rim strip and tape? Why are you using tape over a rim strip? This sounds very weird, and the sort of thing that might create mounting issues.
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