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Search: Posts Made By: unterhausen
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Forum: Framebuilders
03-16-24, 01:56 PM
Replies: 32
Views: 585
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: 5
Views: 172
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: 585
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: 585
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: 151
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: 585
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: 451
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: 585
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: 14
Views: 278
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: 585
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: 585
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: 585
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: 1,088
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: 295
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: 1,088
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: 677
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: 424
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: 416
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: 416
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: 216
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: 1,360
Posted By unterhausen

Closing for moderator review.

Closing for moderator review.
Forum: Framebuilders
02-15-24, 09:01 AM
Replies: 3
Views: 181
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: 786
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: 1,106
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: 786
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: 260
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: 433
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: 792
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: 1,966
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: 1,892
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: 2,026
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: 1,932
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: 2,735
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: 875
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: 3,765
Views: 464,637
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: 292
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...
01-21-24, 06:36 PM
Replies: 144
Views: 5,183
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: 1,174
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: 766
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.
Forum: Framebuilders
01-18-24, 06:03 PM
Replies: 23
Views: 766
Posted By unterhausen

I watch car guys doing miters just to make myself...

I watch car guys doing miters just to make myself feel superior. Same with motorcycle guys brazing fillets.
01-18-24, 06:00 PM
Replies: 48
Views: 2,012
Posted By unterhausen

I'd just like to thank wheelreason for...

I'd just like to thank wheelreason for reinforcing my statement about people that don't know they aren't funny.
01-18-24, 01:17 PM
Replies: 48
Views: 2,012
Posted By unterhausen

This is your reminder that political posting is...

This is your reminder that political posting is not allowed outside of the P&R forum. Everyone agreed to this when they signed up for an account. It really doesn't matter if you are joking or not,...
Forum: Framebuilders
01-17-24, 01:08 PM
Replies: 23
Views: 766
Posted By unterhausen

Interesting, I have some of those. I'll have to...

Interesting, I have some of those. I'll have to try it. The tubes I want to strip are cut out of frames already, so no hidden parts. Removing paint mechanically is much better than the alternatives
Forum: Framebuilders
01-17-24, 10:16 AM
Replies: 23
Views: 766
Posted By unterhausen

I'm assuming a bird's nest wheel is called a "cup...

I'm assuming a bird's nest wheel is called a "cup wheel" here in the states. I never had much luck with a grinder, always had to burn off the paint. Which isn't a good idea. I have a stack of tubes...
Forum: Framebuilders
01-16-24, 01:59 PM
Replies: 21
Views: 792
Posted By unterhausen

I think you'll have to drop your rant, road...

I think you'll have to drop your rant, road racing outside of parking lot crits is dying in the U.S.

I see shops saying they can't sell low-end road bikes, just $5000 road bikes. That certainly...
01-16-24, 01:27 PM
Replies: 69
Views: 2,250
Posted By unterhausen

I have never been able to feel any resistance...

I have never been able to feel any resistance from a dynohub. It's certainly not like the old days with sidewall dynos. I know intellectually that it's stealing power, but I can't feel it.
I much...
Forum: Framebuilders
01-14-24, 02:08 PM
Replies: 7
Views: 322
Posted By unterhausen

To me, it looks like your adjuster is drooping a...

To me, it looks like your adjuster is drooping a bit. If that's not true, did they drill the hole crooked?
Forum: Framebuilders
01-14-24, 02:06 PM
Replies: 21
Views: 792
Posted By unterhausen

There is so much B.S. in the bike community that...

There is so much B.S. in the bike community that I really have to work to ignore it most of the time. This definitely includes opinions from framebuilders. There are no qualifications for becoming a...
01-13-24, 04:16 PM
Replies: 80
Views: 2,735
Posted By unterhausen

I recommend looking at the files section. ...

I recommend looking at the files section. Although the person that runs that group has posted the "ultimate guide" on zwift insider, recently updated https://zwiftinsider.com/zwift-pc-guide-2/
It...
Replies: 21
Views: 1,377
Posted By unterhausen

It's really hard for a randonneur to agree that...

It's really hard for a randonneur to agree that there isn't overlap between distance racing and randonneuring. RUSA is run by a batch of people who have been ignoring the fact that randonneuring...
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