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Search: Posts Made By: unterhausen
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04-16-24, 11:25 AM
Replies: 13
Views: 337
Posted By unterhausen

I offer a service where you tell me the results...

I offer a service where you tell me the results you want from a geometry change, and I'll convince you that's what you'll get.
04-15-24, 07:18 AM
Replies: 39
Views: 855
Posted By unterhausen

The only problem with using tool chests for...

The only problem with using tool chests for storage becomes apparent if you ever have to empty them. I decided to repurpose one for the storage of tools, and the stuff I had in there filled up 6...
04-13-24, 08:44 AM
Replies: 56
Views: 2,087
Posted By unterhausen

It seems to me that the mathematician that...

It seems to me that the mathematician that introduced the cycling world to Hopf bifurcations didn't even look at the dynamics of a bicycle, so it bothers me a little that people talk about it like...
04-13-24, 08:17 AM
Replies: 31
Views: 905
Posted By unterhausen

I have a saddle with crabon rails, and it has a...

I have a saddle with crabon rails, and it has a warning sticker only to use it on a road bike, no off-road. It matches the paint job of my gravel bike, so that's a bummer. Probably going to use it on...
Forum: Framebuilders
04-11-24, 09:59 AM
Replies: 24
Views: 595
Posted By unterhausen

It might be worthwhile to look at Paterek, Talbot...

It might be worthwhile to look at Paterek, Talbot and the Proteus manual. Just treat them all with skepticism. I'm sure Dave Levy has more experience and knowledge than all those authors combined....
03-26-24, 03:11 PM
Replies: 52
Views: 2,424
Posted By unterhausen

I'm a little surprised this happened, tbh. Back...

I'm a little surprised this happened, tbh. Back in the '70s, we used to get replacement forks that were meant to fit every frame possible and thus had a very long threaded section. Thankfully, I...
Forum: Road Cycling
03-24-24, 07:28 AM
Replies: 162
Views: 7,882
Posted By unterhausen

You can request that your account be deleted, but...

You can request that your account be deleted, but not in a random thread. Happens occasionally. Make a request in the user assistance subforum.
This user appears to be a person to me, I wish people...
03-22-24, 07:20 PM
Replies: 150
Views: 5,160
Posted By unterhausen

I keep hoping prices will come back down a...

I keep hoping prices will come back down a little, but so far I have been disappointed. It's not like they are that more expensive than they were before, unless you're buying fatbike tires
At least...
03-22-24, 07:17 PM
Replies: 1,093
Sticky Banned Users
Views: 574,545
Posted By unterhausen

rydabent -- permanent. Repeated rules violations...

rydabent -- permanent. Repeated rules violations - High Maintenance
03-21-24, 08:52 PM
Replies: 642
Views: 16,407
Posted By unterhausen

I take it you have never done any engineering...

I take it you have never done any engineering work with carbon? I was mostly addressing people's examples of vintage carbon that wasn't much lighter than contemporary steel frames. Designers were...
Forum: Framebuilders
03-16-24, 01:56 PM
Replies: 32
Views: 969
Posted By unterhausen

Maybe I shouldn't have brought alignment into it,...

Maybe I shouldn't have brought alignment into it, but I feel like it's a common reason for shimmy. Bob Dopolina (BDop bike parts founder) used to post in every thread about shimmy that he knew that...
03-16-24, 09:25 AM
Replies: 16
Views: 609
Posted By unterhausen

I agree about the lag. Back when my chest strap...

I agree about the lag. Back when my chest strap still worked, the lag in my heartrate doing intervals was pretty long. I suppose regulating to heartrate would be more useful if you wanted to do...
Forum: Framebuilders
03-15-24, 08:16 PM
Replies: 32
Views: 969
Posted By unterhausen

Like I said, shimmy is a fundamental aspect of...

Like I said, shimmy is a fundamental aspect of the steering geometry. I'll admit this doesn't prove it's not stiffness, but I have presented extremely good evidence that it's not on normal bikes. I'm...
Forum: Framebuilders
03-15-24, 03:17 PM
Replies: 32
Views: 969
Posted By unterhausen

Bicycle steering geometry is self-righting, the...

Bicycle steering geometry is self-righting, the front wheel automatically goes back to center. There is also the matter of flop, which drives the wheels away from center. It's a situation that's...
Forum: Framebuilders
03-15-24, 03:06 PM
Replies: 4
Views: 357
Posted By unterhausen

Yeah, sorry I was wrong about it, I guess I was...

Yeah, sorry I was wrong about it, I guess I was thinking about zona. The big difference for the tubes I buy is that life tubes are usually at least a little thicker. But nowadays they have "life...
Forum: Framebuilders
03-14-24, 07:54 PM
Replies: 32
Views: 969
Posted By unterhausen

That's not how structural vibration works, it's...

That's not how structural vibration works, it's really pretty deterministic in a structure like a bicycle. With the right equipment, you can measure the frequencies where it will vibrate. There is...
03-14-24, 04:30 PM
Replies: 12
Views: 532
Posted By unterhausen

that only matters if the newspaper is from the...

that only matters if the newspaper is from the future. That would be weird. Here's how my scenario works. Pick very old newspaper from hoarders stack, wrap bike in it, and then seal the box.
Forum: Framebuilders
03-14-24, 12:07 PM
Replies: 32
Views: 969
Posted By unterhausen

There has been plenty of research on shimmy on...

There has been plenty of research on shimmy on motorcycles. You can find videos of "tank slappers." They generally don't consider stiffness at all, but the one (simulation based) paper I read that...
03-14-24, 07:33 AM
Replies: 25
Views: 874
Posted By unterhausen

All the Cygolyte headlights I have seen have a...

All the Cygolyte headlights I have seen have a Fresnel lens. So it's shaped, but the shape is symmetric vertically. It actually works fairly well, I keep forgetting there is a cutoff until I turn...
Forum: Framebuilders
03-14-24, 07:26 AM
Replies: 32
Views: 969
Posted By unterhausen

I have seen people that the test in the Pyrenees....

I have seen people that the test in the Pyrenees. was conducted on bikes that didn't fit properly. My '80s racing bike can be terrifying to descend on, because it shimmies at around 30mph if you...
Forum: Framebuilders
03-12-24, 12:20 PM
Replies: 32
Views: 969
Posted By unterhausen

I try to ignore shimmy being blamed on frame...

I try to ignore shimmy being blamed on frame stiffness, but single oversize tubing generally the same torsional stiffness as standard tubing. Because of wall thickness. But if a touring frame...
Forum: Framebuilders
03-12-24, 09:04 AM
Replies: 32
Views: 969
Posted By unterhausen

I'm not light, and I tend to push big gears...

I'm not light, and I tend to push big gears occasionally. Standard tubing really isn't as bad as people say, but the effects of propaganda last a very long time. The steel tube manufactures had to...
03-11-24, 02:06 PM
Replies: 67
Views: 1,648
Posted By unterhausen

I have had that experience. Riding with a 1.1...

I have had that experience. Riding with a 1.1 w/kg group isn't easy because it takes too little effort. But then get behind for some reason and it feels like they are in an all-out sprint. But...
03-10-24, 01:31 PM
Replies: 7
Views: 359
Posted By unterhausen

I imagine using edge for login is enough to get...

I imagine using edge for login is enough to get Norton excited. Microsoft pops something up from the task bar occasionally due to zwift starting up, but I'm never wearing my glasses when it happens...
03-10-24, 01:27 PM
Replies: 67
Views: 1,648
Posted By unterhausen

I definitely am a neophyte on zwift not thinking...

I definitely am a neophyte on zwift not thinking about drops. I guess I just have false memories of seeing it affecting xp.

The problem I have is going too hard up the hills and getting too far in...
03-09-24, 09:36 AM
Replies: 24
Views: 813
Posted By unterhausen

Top tube length doesn't matter, unless it's too...

Top tube length doesn't matter, unless it's too long. But even then, it would have to be vastly too long to be a problem Have we all forgotten that stems come in more than one length?

If you...
Forum: Framebuilders
03-06-24, 09:52 AM
Replies: 17
Views: 615
Posted By unterhausen

I think the failure of that fork Andy is talking...

I think the failure of that fork Andy is talking about can be traced back to drilling vent holes on the outside diameter of the crown segment. Those crown segments see a lot of fatigue cycles. They...
Forum: Framebuilders
03-05-24, 06:22 PM
Replies: 12
Views: 603
Posted By unterhausen

What PPE do you use? I probably should start...

What PPE do you use? I probably should start wearing a mask when I braze. When I search online for my asthma symptoms, they may actually be COPD symptoms. So brazing/welding is bad news.
Forum: Framebuilders
03-05-24, 10:23 AM
Replies: 12
Views: 603
Posted By unterhausen

It's going to be difficult to flow silver into...

It's going to be difficult to flow silver into there because you can't clean it properly. I have had luck with brass and dirty surfaces, but that takes a real torch. The problem with not having any...
02-23-24, 06:46 PM
Replies: 13
Views: 291
Posted By unterhausen

I'm sure polarity matters on the trainer side. ...

I'm sure polarity matters on the trainer side. Many a kickr has been smoked due to getting the right voltage power supply with the wrong polarity. I expect other trainers are the same.

Are you...
02-17-24, 03:20 PM
Replies: 41
Views: 1,501
Posted By unterhausen

Closing for moderator review.

Closing for moderator review.
Forum: Framebuilders
02-15-24, 09:01 AM
Replies: 3
Views: 233
Posted By unterhausen

There is always some blacksmithing involved in...

There is always some blacksmithing involved in getting fork blades into fork crowns. I might not even notice the difference. If there is a gap anywhere, you can bend the crown into compliance and...
Forum: Framebuilders
02-14-24, 05:42 PM
Replies: 17
Views: 902
Posted By unterhausen

That's too bad. Apropos of nothing, Philly bike...

That's too bad. Apropos of nothing, Philly bike show is coming up in March. I can't decide if I'm going. Maybe.
02-14-24, 11:35 AM
Replies: 30
Views: 1,260
Posted By unterhausen

I don't know why we have to have this...

I don't know why we have to have this conversation over and over again. Maybe save it for an ebike thread in General or Road?
I am not sure what motivation for the argument against calling an ebike...
Forum: Framebuilders
02-13-24, 10:45 AM
Replies: 17
Views: 902
Posted By unterhausen

There aren't too many pro framebuilders in here...

There aren't too many pro framebuilders in here and those pros that lurk probably aren't going to want to weigh in on your issues. I also wonder if you really want to air out your problems in a...
Forum: Framebuilders
02-12-24, 10:03 AM
Replies: 6
Views: 311
Posted By unterhausen

There is a forum about fitting.

There is a forum about fitting.
Forum: Framebuilders
02-10-24, 01:34 PM
Replies: 11
Views: 490
Posted By unterhausen

Side tack twin top tubes were pretty common on...

Side tack twin top tubes were pretty common on cruisers at one time. Look for pictures of a bike with a fake gas tank.
Forum: Framebuilders
02-04-24, 09:34 AM
Replies: 21
Views: 896
Posted By unterhausen

I'm not sure why we're arguing springs though, it...

I'm not sure why we're arguing springs though, it doesn't seem relevant to bike frames. Spring failure occurs after obvious plastic deformation across the full section of the spring. Bike frames...
02-02-24, 09:19 AM
Replies: 61
Views: 2,348
Posted By unterhausen

Since we drifted to the other end of the scale...

Since we drifted to the other end of the scale from the OP, I dropped my trainer difficulty to 25%, and I like it a lot better. Still enough that you can pedal downhill, but the climbs aren't as...
02-01-24, 04:26 PM
Replies: 57
Views: 2,100
Posted By unterhausen

I have a spot tracker. It turns out that there is...

I have a spot tracker. It turns out that there is no cell service just over the next mountain, only about 10 miles from our house. On my spot, there are 3 buttons, which I will call: "sos", "oh...
Forum: Framebuilders
01-31-24, 08:37 AM
Replies: 43
Views: 2,346
Posted By unterhausen

I'd just like to note that on the danger scale...

I'd just like to note that on the danger scale from zero to Mr. Bulgier wouldn't do it, this mod has failed.
01-27-24, 03:40 PM
Replies: 53
Views: 2,039
Posted By unterhausen

Shimmy is much more likely from a load on the...

Shimmy is much more likely from a load on the back. My '80s road bike would shimmy reliably at about 40mph if I put my weight too far back. In the absence of a crash, shimmy is unlikely to cause any...
01-26-24, 12:24 PM
Replies: 80
Views: 2,943
Posted By unterhausen

Shimano says the Cues cassette isn't compatible. ...

Shimano says the Cues cassette isn't compatible. I wouldn't bother finding out if they are being too conservative and just go with the Alivio. Or go visit a bike shop
01-26-24, 12:19 PM
Replies: 24
Views: 1,035
Posted By unterhausen

teleporting is nice. Just before they introduced...

teleporting is nice. Just before they introduced it, I was riding with a robopacer group and they went right and I went left. There was no way I was going to catch them. Now I use it a lot. Start...
01-24-24, 06:09 PM
Replies: 3,898
Views: 473,325
Posted By unterhausen

Moved some posts here from 50+

Moved some posts here from 50+
Forum: Framebuilders
01-24-24, 12:34 PM
Replies: 5
Views: 332
Posted By unterhausen

People do all kinds of unwise things for internet...

People do all kinds of unwise things for internet clout. From what I have seen of aluminum forks, it makes no sense to cut holes in them. And I doubt most people can cut a hole in carbon without...
01-24-24, 09:04 AM
Replies: 27
Views: 2,657
Posted By unterhausen

But they are not driving now and the congestion...

But they are not driving now and the congestion pricing won't hurt them. It will make the bus ride take less time. If the city wasn't run by car brains, there would be more bus lanes and they...
01-21-24, 06:36 PM
Replies: 144
Views: 5,502
Posted By unterhausen

In my experience, Shimano's garbage derailleurs...

In my experience, Shimano's garbage derailleurs work pretty well. I actually had one on my backup road bike for a while, I forget why exactly. It came off a hybrid that got hit by a motorist. But the...
Forum: Framebuilders
01-21-24, 06:20 AM
Replies: 12
Views: 1,243
Posted By unterhausen

My gravel bike is going to run 650b x monster...

My gravel bike is going to run 650b x monster tires, or 700c x 44mm. Seemed to me to be the best compromise. I hate the idea of yokes, admittedly for no good reason. Okay, the reason is I'm cheap. I...
Forum: Framebuilders
01-18-24, 06:45 PM
Replies: 23
Views: 874
Posted By unterhausen

The video I have seen of the guy using that...

The video I have seen of the guy using that method has horrible miters, so I can still feel superior.
I'll admit I don't have the patience for it.
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