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Search: Posts Made By: HTupolev
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06-26-22, 03:51 PM
Replies: 83
Views: 1,129
Posted By HTupolev

Current-gen XT (M8100) does not have gear...

Current-gen XT (M8100) does not have gear indicators. Previous-gen XT (M8000) only included the indicators on the non-i-spec model, and they were specifically designed and marketed for easy removal.
06-26-22, 01:44 PM
Replies: 83
Views: 1,129
Posted By HTupolev

Some people wouldn't. Gear indicators are...

Some people wouldn't. Gear indicators are associated with cheap components, and many cyclists think it looks noobish.
Forum: Road Cycling
06-24-22, 02:33 AM
Replies: 64
Views: 1,331
Posted By HTupolev

Well, he did say that he used higher low-end...

Well, he did say that he used higher low-end gearing to go faster, which is a strategy that works best when you're trying to go slow.
Forum: Road Cycling
06-24-22, 02:22 AM
Replies: 37
Views: 712
Posted By HTupolev

I have a hard time believing that. Do you have...

I have a hard time believing that. Do you have photos of latex tubes herniating out of a fully-intact sidewall? Totally excluding rubber from the sidewalls is about as porous as it gets, and yet,...
06-24-22, 12:14 AM
Replies: 523
Views: 18,596
Posted By HTupolev

Eh, depends. There's significantly less...

Eh, depends.

There's significantly less intrinsic disadvantage to old road bikes than most cyclists imagine. Aerodynamically they do generally take a hit to a modern aero-oriented build, and of...
06-23-22, 10:01 PM
Replies: 6
Views: 221
Posted By HTupolev

Long front-center is primarily about keeping the...

Long front-center is primarily about keeping the rider behind the front wheel, i.e. stability in the fore-aft direction.


Depends on what "multisurface" means.
06-23-22, 12:01 PM
Replies: 8
Views: 152
Posted By HTupolev

The small-small method gives the max amount of...

The small-small method gives the max amount of chain if the chain wrap is adequate. If not, and you size with the big-big method, the drivetrain will have enough chain that it's overly slack in...
06-22-22, 11:13 PM
Replies: 19
Views: 467
Posted By HTupolev

Neither rubber cement nor Gorilla Glue are very...

Neither rubber cement nor Gorilla Glue are very good fluids for patching butyl tubes. You want a fluid that will react properly with the patch: the safest bet that's widely-available and convenient...
06-22-22, 04:27 PM
Replies: 374
Views: 7,826
Posted By HTupolev

If that was all that was on offer, sure. An...

If that was all that was on offer, sure. An extreme price differential doesn't make a good part work any less well.

I have one wheelset with $30 rims and $90 tires. Works great.
06-22-22, 02:28 PM
Replies: 374
Views: 7,826
Posted By HTupolev

Have you actually looked very hard? Tange makes a...

Have you actually looked very hard? Tange makes a variety of BBs under multiple brands (i.e. IRD) and at multiple quality tiers, for instance.

I'd also question whether a lack of intermediate-tier...
06-22-22, 12:43 PM
Replies: 374
Views: 7,826
Posted By HTupolev

FC-7200 is a fairly standard square-taper crank,...

FC-7200 is a fairly standard square-taper crank, you only "had to" use a forty-year-old part because you decided to use an exact period replacement. Most bikes in the 40-year-old range are still...
Forum: Road Cycling
06-21-22, 09:17 PM
Replies: 64
Views: 1,331
Posted By HTupolev

How heavy is your current frame, and what road...

How heavy is your current frame, and what road frame would you be looking at?

For instance, a Giant Revolt frameset versus an S-Works Aethos frameset is around a pound. For a 170lb road rider...
Forum: Road Cycling
06-21-22, 05:26 PM
Replies: 37
Views: 712
Posted By HTupolev

Low stiffness. Specifically low stiffness in...

Low stiffness. Specifically low stiffness in compression if we're talking about tires, since they're always very stiff in tension.
06-21-22, 02:23 PM
Replies: 83
Views: 1,129
Posted By HTupolev

If there's some particular gear you want...

If there's some particular gear you want indicated for some purpose, you could certainly mark an alignment line to serve this purpose. Just draw the line between the shifter body and the shifter grip...
06-13-22, 06:27 PM
Replies: 200
Views: 4,895
Posted By HTupolev

It's true that "1+1=2" is dependent on certain...

It's true that "1+1=2" is dependent on certain assumptions, but it can be said that under those assumptions, it is a factual statement. Furthermore, the degree to which those assumptions have...
Forum: Road Cycling
06-12-22, 06:06 PM
Replies: 40
Views: 1,189
Posted By HTupolev

Different postures need to be trained for in...

Different postures need to be trained for in general, and recumbents are a big change in posture.

I don't ride recumbent, but I know a couple guys with Bacchettas. Right now they aren't getting...
06-11-22, 01:39 AM
Replies: 374
Views: 7,826
Posted By HTupolev

It's a regional and seasonal thing. Dry-weather...

It's a regional and seasonal thing. Dry-weather bikes most anywhere don't see much rim wear. Wet-weather bikes also can escape most rim wear if the wetness isn't very abrasive, or if there's minimal...
06-10-22, 09:44 PM
Replies: 200
Views: 4,895
Posted By HTupolev

Texturing the drum can theoretically allow you to...

Texturing the drum can theoretically allow you to characterize the hysteresis consequences of more complex tread deformation than a smooth drum, although it's not obvious how much value there is in...
06-10-22, 03:51 PM
Replies: 200
Views: 4,895
Posted By HTupolev

No, Crr*W is the force. If you multiply by d...

No, Crr*W is the force. If you multiply by d you're calculating the work overcoming that force over that distance.

If you want power, multiple F by your speed.



When aerodynamics are...
06-10-22, 01:18 AM
Replies: 9
Views: 276
Posted By HTupolev

Mount one drive-side crank to one side of your...

Mount one drive-side crank to one side of your BB, and the other to the other side of your BB. Mount a fixed cog to both sides of a wheel with a two-sided hub, attach it to your bicycle, and chain up...
06-09-22, 11:02 PM
Replies: 200
Views: 4,895
Posted By HTupolev

After you account for the fact that larger wheels...

After you account for the fact that larger wheels rotate slower at a given bicycle speed, rotational kinetic energy for a given bicycle speed is double for mass at the rim than the same mass on the...
06-09-22, 06:48 PM
Replies: 200
Views: 4,895
Posted By HTupolev

Yes, but inertia works both ways. A heavier rim...

Yes, but inertia works both ways. A heavier rim that resists acceleration also resists deceleration.
06-09-22, 05:46 PM
Replies: 45
Views: 1,427
Posted By HTupolev

Mostly fine, although if it's a spirited group...

Mostly fine, although if it's a spirited group taking tight corners at speed it could be an issue depending on BB height and crank length, if they're really trying to ride in with the group and...
06-09-22, 02:38 PM
Replies: 200
Views: 4,895
Posted By HTupolev

What, rotational inertia within Newtonian...

What, rotational inertia within Newtonian mechanics?

Yeah, it hasn't been updated since the 18th century. Whenever I'm riding my bicycle at 200,000,000mph on the surface of a neutron star, the...
Forum: Road Cycling
06-08-22, 11:26 PM
Replies: 17
Views: 385
Posted By HTupolev

The OP makes it sound like they have tried it. ...

The OP makes it sound like they have tried it.


In many places, the gravel right-of-ways are much more vertical than the paved right-of-ways.

Out in the Seattle area, I'm nearly always...
06-08-22, 03:17 PM
Replies: 200
Views: 4,895
Posted By HTupolev

How did you conclude a 9-11s difference? That...

How did you conclude a 9-11s difference? That would be an incredibly low impact for a Crr delta of .001 to have.
06-08-22, 10:27 AM
Replies: 23
Views: 469
Posted By HTupolev

Depends on the frameset and the brakes. You're in...

Depends on the frameset and the brakes. You're in a better position to know this than we are since you have the bicycle on hand. If not, Paul Motolites will likely work as a solution, albeit a pricey...
06-08-22, 10:19 AM
Replies: 8
Views: 269
Posted By HTupolev

In the event that you do need a new rear...

In the event that you do need a new rear derailleur, any 7/8/9-speed Shimano rear derailleur that isn't a 74xx Dura Ace should be compatible as long as it can handle your cog size and chain wrap....
06-07-22, 09:02 PM
Replies: 200
Views: 4,895
Posted By HTupolev

1-Friction forces between a typical sealed road...

1-Friction forces between a typical sealed road surface and a tire are substantially more proportional to total normal force than to contact area. A small contact area mostly just makes the friction...
Forum: Road Cycling
06-07-22, 11:13 AM
Replies: 11
Views: 558
Posted By HTupolev

I don't get the impression that the photo was...

I don't get the impression that the photo was taken during the race.
Forum: Touring
06-07-22, 03:10 AM
Replies: 79
Views: 1,944
Posted By HTupolev

It's certainly possible to do lighter touring...

It's certainly possible to do lighter touring builds, but it's not atypically heavy.


No, but I don't think that it makes sense to worry about overall weight in lieu of individual choices.
...
06-06-22, 04:04 PM
Replies: 24
Views: 446
Posted By HTupolev

Shimano. Yes, and also Shimano. ...

Shimano.


Yes, and also Shimano.


Shimano still has multiple current-generation 9-speed groupsets in its catalog, including a 3x9 road-targeted offering in the form of Sora R3030.
Forum: Road Cycling
06-05-22, 10:40 PM
Replies: 27
Views: 835
Posted By HTupolev

When you say "old cam", are you referring to ones...

When you say "old cam", are you referring to ones where the leverage doesn't fall into a very pronounced valley at the end of the closure?
06-05-22, 08:20 PM
Replies: 27
Views: 861
Posted By HTupolev

If you're getting sidewall cuts, the solution...

If you're getting sidewall cuts, the solution will probably be to go wider and/our tougher. Paselas are not built with beefy sidewalls.
Forum: Road Cycling
06-02-22, 10:29 AM
Replies: 20
Views: 616
Posted By HTupolev

What "ride benefits" do you expect tubeless to...

What "ride benefits" do you expect tubeless to offer compared with supple low-hysteresis inner tubes? Are you currently inflating your road tires harder-than-optimal because of the tubed setup?
Forum: Road Cycling
06-02-22, 09:31 AM
Replies: 16
Views: 472
Posted By HTupolev

That really just depends on how heavily used...

That really just depends on how heavily used those things are.


If we're talking 20-year old Ultegra or 105, what single point of failure would require two new parts in addition to the failed...
06-02-22, 12:52 AM
Replies: 43
Views: 1,119
Posted By HTupolev

That's because people are all over the place....

That's because people are all over the place. Gravel bike use cases are very heavily regional, depending on the geology, geography, and types of right-of-ways. I wouldn't choose a gravel bike based...
05-31-22, 11:16 AM
Replies: 20
Views: 516
Posted By HTupolev

It's been a few years since I've used one, but in...

It's been a few years since I've used one, but in my experience, they do. Or at least the 6-speed 14-28 ones that I use do. It's a consequence of a sloppy bearing assembly. Wear can lead to squeals...
Forum: Road Cycling
05-30-22, 06:17 PM
Replies: 177
Views: 3,258
Posted By HTupolev

It's difficult as an end user because very few...

It's difficult as an end user because very few 11/12-speed cassettes are designed with evenly-stepped ratios, and because matching half-step cranksets don't exist. But that's not something that a...
Forum: Road Cycling
05-30-22, 06:05 PM
Replies: 177
Views: 3,258
Posted By HTupolev

Err, I think now that I'm confused as to what you...

Err, I think now that I'm confused as to what you mean by "cog tracking." I had assumed that you were referring to the geometric path that the jockey wheel takes relative to the cassette, but now I'm...
Forum: Road Cycling
05-30-22, 03:04 PM
Replies: 177
Views: 3,258
Posted By HTupolev

The use of pulleys does not in and of itself...

The use of pulleys does not in and of itself facilitate cog-tracking. Rear derailleurs may employ a jockey offset or b-pivot rotation, but these aspects exist in part to circumvent challenges created...
Forum: Road Cycling
05-30-22, 01:20 PM
Replies: 177
Views: 3,258
Posted By HTupolev

That's not a very useful way to frame the size of...

That's not a very useful way to frame the size of a gearing jump. 40gi-to-48gi and 80gi-to-88gi are both jumps of 8gi, but the former will have twice the impact on cadence and torque because it's a...
Forum: Road Cycling
05-26-22, 09:41 PM
Replies: 6
Views: 264
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: 5
Views: 320
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: 58
Views: 1,445
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: 58
Views: 1,445
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: 58
Views: 1,445
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: 58
Views: 1,445
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: 58
Views: 1,445
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: 921
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...
Showing results 1 to 50 of 1000
 


 
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