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Search: Posts Made By: HTupolev
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Forum: Road Cycling
05-26-22, 09:41 PM
Replies: 6
Views: 162
Posted By HTupolev

He's right. Prior to 2015, Shimano 10-speed road...

He's right. Prior to 2015, Shimano 10-speed road rear derailleurs used the same actuation as 8/9-speed (road and mountain) rear derailleurs. Since you have a pre-2015 10-speed road drivetrain, an...
Forum: Road Cycling
05-25-22, 11:04 PM
Replies: 4
Views: 155
Posted By HTupolev

Even touring bikes can lose stability when...

Even touring bikes can lose stability when rear-heavy. They're usually better at dealing with it than non-touring bikes with otherwise-similar construction, but it's a poor situation to begin with....
Forum: Road Cycling
05-25-22, 02:14 PM
Replies: 56
Views: 1,085
Posted By HTupolev

I wasn't disagreeing with what you wrote. I was...

I wasn't disagreeing with what you wrote. I was criticizing some of the arguments that get made against significant front-rear pressure differences.
Forum: Road Cycling
05-25-22, 01:46 PM
Replies: 56
Views: 1,085
Posted By HTupolev

The problem that I have with the "use a small...

The problem that I have with the "use a small differential to avoid front tire collapse" reasoning is that it doesn't seem like a logical solution to the proposed issue. Many proponents of the...
Forum: Road Cycling
05-25-22, 01:38 PM
Replies: 56
Views: 1,085
Posted By HTupolev

Tubes impose almost zero resistance to stretching...

Tubes impose almost zero resistance to stretching when subjected to pressure. They always stretch to fill the cavity within the rim and tire no matter what nominal size they are.

Like, if you take...
Forum: Road Cycling
05-25-22, 10:52 AM
Replies: 56
Views: 1,085
Posted By HTupolev

How would a tube "push the tire out from the...

How would a tube "push the tire out from the rim"?

The tire is the pressure vessel with high tensile stiffness, not the inner tube. Inner tubes don't really have an engineered PSI threshold, and...
Forum: Road Cycling
05-24-22, 02:58 AM
Replies: 56
Views: 1,085
Posted By HTupolev

That's a dangerous blanket statement. It's...

That's a dangerous blanket statement.

It's true that some tire models are nominally tested against blowoffs to a very wide pressure margin, but that's not the same as guaranteeing that a tire will...
Forum: Road Cycling
05-24-22, 01:40 AM
Replies: 32
Views: 783
Posted By HTupolev

You wouldn't be the first person to strap aero...

You wouldn't be the first person to strap aero bars on them, but they don't have a TT/Tri-oriented geometry. Depending on your required fit, it may be challenging or impossible to get the saddle far...
05-19-22, 09:13 PM
Replies: 22
Views: 498
Posted By HTupolev

Not entirely true. Referring to 650b as a "26...

Not entirely true. Referring to 650b as a "26 inch" size is uncommon, but historically it has carried the "26 x 1 1/2" label.
Forum: Road Cycling
05-18-22, 11:55 PM
Replies: 26
Views: 458
Posted By HTupolev

Have you considered SPDs? Many recessed-cleat...

Have you considered SPDs? Many recessed-cleat shoes are viable for all-day use.
05-17-22, 12:59 PM
Replies: 15
Views: 407
Posted By HTupolev

That's contrary to my experience. The issue is...

That's contrary to my experience. The issue is even seating: the symptom of loose bead seat fit is that it's harder to get tires to mount without twists or hops.


On rims of what type and age?...
05-17-22, 12:32 AM
Replies: 7
Views: 330
Posted By HTupolev

SRAM 10-speed and 11-speed road rear derailleurs...

SRAM 10-speed and 11-speed road rear derailleurs use the same actuation ratio, so it's a Force 1 11-speed rear derailleur would work with your shifters. The medium-cage version is designed to deal...
Forum: Road Cycling
05-15-22, 06:28 PM
Replies: 50
Views: 1,461
Posted By HTupolev

Draft has a diminished impact when you're going...

Draft has a diminished impact when you're going slow up steep gradients, but being able to draft effectively on the flats has a huge effect on recovering and staying fresh for the hills.

Also, I'm...
Forum: Road Cycling
05-15-22, 06:13 PM
Replies: 50
Views: 1,461
Posted By HTupolev

In the OP you said that the flats are easy for...

In the OP you said that the flats are easy for you, but here you're showing a ~300W effort along the flats when the other guy is showing much lower choppy power. Are you doing big pulls right before...
05-15-22, 02:28 PM
Replies: 15
Views: 407
Posted By HTupolev

Why? In my experience, one nearly always...

Why?

In my experience, one nearly always wants rim tape under the tire's bead. Most rims are dimensioned for it, and can suffer from sloppy tire fitment otherwise. Tape that only covers the middle...
05-13-22, 09:38 PM
Replies: 71
Views: 1,187
Posted By HTupolev

Not as a primary driving design consideration,...

Not as a primary driving design consideration, no. But in many of their goals, they benefit from choices that result in greater comfort. The main reason that the use of racing bikes tends to be...
05-12-22, 09:45 PM
Replies: 31
Views: 679
Posted By HTupolev

I'm a little confused by the sequence of events....

I'm a little confused by the sequence of events. Your concern seems to be that the chain/derailleur will jump into the spokes on the rear wheel, but here you're saying that it was stuck between your...
05-10-22, 04:16 PM
Replies: 79
Views: 2,067
Posted By HTupolev

As someone who hasn't precisely tested the issue,...

As someone who hasn't precisely tested the issue, I'm not sure. Generally I do pump wider tires lower in like-for-like riding.


What do you mean? Adequately-low pressure to avoid discomfort from...
05-10-22, 11:23 AM
Replies: 79
Views: 2,067
Posted By HTupolev

It's unclear to me how Bierman evaluates that...

It's unclear to me how Bierman evaluates that equal drop against a flat surface is "equal comfort." At least under static testing, the spring rate of a tire depends on the curvature of the object...
Replies: 42
Views: 1,436
Posted By HTupolev

[/b] It's hard to guess without testing, but...

[/b]
It's hard to guess without testing, but none of the tires that you're bringing up are designed to put much emphasis on paved performance.


If your knobbies are worn bald, it might not be a...
05-08-22, 05:03 PM
Replies: 79
Views: 2,067
Posted By HTupolev

What are you comparing with what? Under many...

What are you comparing with what? Under many circumstances, it's true that the total aerodynamic drag on a bike+rider system is far higher than the rolling resistance. But aerodynamic drag happens...
Forum: Road Cycling
05-05-22, 07:25 PM
Replies: 11
Views: 610
Posted By HTupolev

Not necessarily. It's very difficult to determine...

Not necessarily. It's very difficult to determine a "good enough" pressure for pinch flats, because riding circumstances and the shape of the impact surface both dramatically affect how deeply the...
05-03-22, 09:09 PM
Replies: 17
Views: 407
Posted By HTupolev

The RD-RX812 is rated for large cogs because it's...

The RD-RX812 is rated for large cogs because it's targeted at 1x applications, not because it's intended for wider-range drivetrains than the RD-RX810.

I know a number of people who use RD-RX400...
Replies: 42
Views: 1,436
Posted By HTupolev

Within the range of common wheel sizes, wheel...

Within the range of common wheel sizes, wheel diameter really doesn't have a large effect on performance on pavement. At least not directly: availability of performance-oriented equipment is a...
04-30-22, 09:46 PM
Replies: 66
Views: 1,881
Posted By HTupolev

I'm not sure that that can be well-characterized...

I'm not sure that that can be well-characterized as an "origin." The Cambio Corsa was a rare example of a derailleur that required a horizontal dropout, but it's not where horizontal dropouts...
04-30-22, 09:19 PM
Replies: 66
Views: 1,881
Posted By HTupolev

Yes. It also offers versatility, allowing a frame...

Yes. It also offers versatility, allowing a frame to be readily used without any chain tensioners: this allows fixed gear, and also means that nothing kludgy needs to happen to support other...
Forum: Road Cycling
04-29-22, 10:55 AM
Replies: 54
Views: 1,596
Posted By HTupolev

Why is it less of a concern? A larger tire means...

Why is it less of a concern? A larger tire means potentially a larger penalty for poor aerodynamic shape. And today's "large" road tires are still ridden in road-cycling contexts and at road-cycling...
Forum: Road Cycling
04-27-22, 01:27 AM
Replies: 198
Views: 9,847
Posted By HTupolev

While latex tubes are softer than butyl, I'm not...

While latex tubes are softer than butyl, I'm not convinced that they're dramatically more vulnerable to being smashed with a lever than butyl. The trouble is, if you're employing a technique that...
04-23-22, 10:31 PM
Replies: 78
Views: 2,230
Posted By HTupolev

I've only had one snakebite flat in the normal...

I've only had one snakebite flat in the normal process of paved riding ever, and it was while riding tubed 25mm tubed tires at around 100r/90f with bike+rider weight of ~195lbs, which is higher than...
04-22-22, 10:38 AM
Replies: 78
Views: 2,230
Posted By HTupolev

Not necessarily. Depends on flat rate and the...

Not necessarily. Depends on flat rate and the particular tires being compared, and how long you take to resolve punctures. A fast racing tire can often be faster over a century than something like a...
04-21-22, 06:35 PM
Replies: 11
Views: 729
Posted By HTupolev

I think that the difference in compatibility spec...

I think that the difference in compatibility spec between the two derailleurs is a consequence of product lineup more than any actual design differences. I know several people running RD-RX810 on...
04-20-22, 11:18 AM
Replies: 11
Views: 729
Posted By HTupolev

Yes. Shimano's original 10-speed road groupsets...

Yes. Shimano's original 10-speed road groupsets used the same rear derailleur actuation as 8/9-speed. But starting with Tiagra 4700 in 2015, new Shimano 10-speed road uses the same rear derailleur...
04-08-22, 02:36 AM
Replies: 43
Views: 2,561
Posted By HTupolev

It can be as much as inches.

It can be as much as inches.
04-07-22, 05:25 PM
Replies: 43
Views: 2,561
Posted By HTupolev

And frames with headtubes that terminate...

And frames with headtubes that terminate significantly above the HT/TT junction.
04-07-22, 05:24 PM
Replies: 43
Views: 2,561
Posted By HTupolev

Because the assertion "Stack+BB=Standover" is...

Because the assertion "Stack+BB=Standover" is false. The center of the top of the head tube is generally at a different height from the spot on the top tube that "standover" is measured against. This...
04-07-22, 02:35 AM
Replies: 21
Views: 593
Posted By HTupolev

Yeah, this is basically what brake boosters exist...

Yeah, this is basically what brake boosters exist to address.


Avoiding compressionless housing is like deliberately leave air in the lines when setting up hydraulic discs. Flex causing...
04-06-22, 02:26 AM
Replies: 265
Views: 7,156
Posted By HTupolev

So do you favor foot-pounds per minute, or are...

So do you favor foot-pounds per minute, or are you strong enough that it's most convenient to quantify your pedaling in horsepower?
Forum: Road Cycling
04-03-22, 08:19 PM
Replies: 12
Views: 408
Posted By HTupolev

What model of Maxxis tires? If he's using...

What model of Maxxis tires?

If he's using knobby tires designed for unpaved traction, the first thing I'd suggest is going to something with a road-oriented tread pattern (i.e. slick or grooved)....
Forum: Road Cycling
04-03-22, 12:47 PM
Replies: 12
Views: 408
Posted By HTupolev

What tires has he been using? Is he using the...

What tires has he been using? Is he using the bicycle only for paved riding, or also on unpaved surfaces?
Forum: Road Cycling
03-23-22, 02:37 AM
Replies: 52
Views: 2,444
Posted By HTupolev

How big of a discrepancy were you looking for,...

How big of a discrepancy were you looking for, and how much precision did your testing have?

The speed advantage of latex tubes over butyl can be on the order of a couple tenths of a mph. It's...
Forum: Road Cycling
03-23-22, 01:05 AM
Replies: 52
Views: 2,444
Posted By HTupolev

If anything, I seem to get fewer flats on latex...

If anything, I seem to get fewer flats on latex than on butyl. Latex performs very poorly in plunger puncture tests, but it's not obvious that those tests are representative of how punctures actually...
Forum: Road Cycling
03-16-22, 10:34 PM
Replies: 19
Views: 1,146
Posted By HTupolev

...Come primarily as a result of using kludge...

...Come primarily as a result of using kludge fenders on bicycles that are designed aggressively against fenders. It's a self-fulfilling prophecy that has very little to do with how well-designed and...
03-14-22, 11:46 PM
Replies: 48
Views: 1,631
Posted By HTupolev

Rim brake tracks can absolutely wear rapidly if...

Rim brake tracks can absolutely wear rapidly if you're riding in an abrasive environment. It's a common problem for people who put in big miles in wet conditions in the PNW, for instance: the light...
Forum: Road Cycling
02-14-22, 01:47 AM
Replies: 70
Views: 4,976
Posted By HTupolev

It means that you require more power to overcome...

It means that you require more power to overcome the resistance, yes. But as I noted before:

The power required to overcome a given source of resistance is equal to the resistive force multiplied...
Forum: Road Cycling
02-13-22, 03:53 PM
Replies: 70
Views: 4,976
Posted By HTupolev

Lower speeds mean less power consumed from...

Lower speeds mean less power consumed from rolling resistance, but that's true about nearly all sources of resistance to a moving vehicle. As a proportion of total resistance, rolling resistance...
02-12-22, 11:27 PM
Replies: 15
Views: 552
Posted By HTupolev

https://www.bikeforums.net/21213012-post2.html

https://www.bikeforums.net/21213012-post2.html
02-12-22, 04:34 PM
Replies: 1,672
Views: 347,747
Posted By HTupolev

Pilchuck. https://i.imgur.com/sirrcZt.jpg ...

Pilchuck.

https://i.imgur.com/sirrcZt.jpg

https://i.imgur.com/kOJeTRv.jpg

https://i.imgur.com/R0wNFln.jpg
Forum: Road Cycling
02-12-22, 03:44 PM
Replies: 70
Views: 4,976
Posted By HTupolev

The worst thing about Gatorskins is that they...

The worst thing about Gatorskins is that they last a really long time.
Forum: Road Cycling
02-11-22, 10:07 PM
Replies: 70
Views: 4,976
Posted By HTupolev

Heh. For spirited riding, people almost...

Heh.

For spirited riding, people almost always come around after trying performance-oriented tires.
02-05-22, 03:01 PM
Replies: 1,672
Views: 347,747
Posted By HTupolev

Hampton gravel off Mountain Loop Highway. ...

Hampton gravel off Mountain Loop Highway.

https://i.imgur.com/W9UE0RQ.jpg

Pilchuck poking above the clouds.

https://i.imgur.com/UjGKy1k.jpg
Showing results 1 to 50 of 1000
 


 
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