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Search: Posts Made By: tanhalt
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Forum: Road Cycling
04-11-11, 02:28 PM
Replies: 43
Views: 1,576
Posted By tanhalt

By the looks of the pic, that tire is REALLY...

By the looks of the pic, that tire is REALLY squared off (i.e. worn)...it may have only been ~1500 miles, but that's on the rear of a tandem, right? With the higher weight loading on the rear it's...
Forum: Road Cycling
04-11-11, 11:40 AM
Replies: 43
Views: 1,576
Posted By tanhalt

Tube installation error.

Tube installation error.
Forum: Road Cycling
04-11-11, 11:39 AM
Replies: 43
Views: 1,576
Posted By tanhalt

Again, the order of failure is incorrect in that...

Again, the order of failure is incorrect in that statement. You most likely had the tube "pinched" under the bead of the tire and upon inflation it eventually pushed the bead up out of the rim,...
Forum: Road Cycling
04-11-11, 11:33 AM
Replies: 43
Views: 1,576
Posted By tanhalt

As is typical in these discussions, you got the...

As is typical in these discussions, you got the order of failure incorrect. The tire casing failed first, causing the tube to "escape" and ultimately fail as well. That rear tire looks pretty well...
02-28-11, 07:14 PM
Replies: 12,012
Views: 677,632
Posted By tanhalt

Don't forget the "Whoah, whoah...Oh ****" moment...

Don't forget the "Whoah, whoah...Oh ****" moment ;)

http://i54.tinypic.com/2jb76e.jpg
02-28-11, 05:56 PM
Replies: 12,012
Views: 677,632
Posted By tanhalt

...and yet, you left that part out ;) What's...

...and yet, you left that part out ;)

What's with you guys from Las Vegas raising your hands after a Cat 4 win and then promptly crashing? Don't you guys know there's a rule against removing your...
02-28-11, 05:40 PM
Replies: 12,012
Views: 677,632
Posted By tanhalt

Ahem...are you SURE you were awarded 1st place...

Ahem...are you SURE you were awarded 1st place for the RR? I think a teammate of mine might take issue with that... ;-)
11-29-10, 04:21 PM
Replies: 47
Views: 4,212
Posted By tanhalt

If you're going to have 2 bottles on your bike...

If you're going to have 2 bottles on your bike and a bunch of crap stuffed in your grippers for merely a 40 mile bike race in cool conditions, why bother with the skinsuit?

Now then, if you plan...
Forum: Road Cycling
11-03-10, 11:05 AM
Replies: 53
Views: 2,798
Posted By tanhalt

Either M-Dub or Ben. I'll go with M-Dub.

Either M-Dub or Ben. I'll go with M-Dub.
Forum: Road Cycling
11-03-10, 09:40 AM
Replies: 48
Views: 1,909
Posted By tanhalt

Road tubeless...a solution in search of a problem.

Road tubeless...a solution in search of a problem.
Forum: Road Cycling
11-03-10, 09:39 AM
Replies: 53
Views: 2,798
Posted By tanhalt

I'm amazed that people think that 4 minutes total...

I'm amazed that people think that 4 minutes total is a blazing fast time to change a tube (including checking for whatever punctured). If it takes me more than 4-5 minutes, I know I've been REALLY...
11-03-10, 09:01 AM
Replies: 85
Views: 5,671
Posted By tanhalt

Well, another way of looking at seeing if it...

Well, another way of looking at seeing if it passes the "smell test" is to calculate the change in frontal area caused by the 3 hole vs. 4 hole configurations (the 3 hole has a thin adapter plate)...
11-02-10, 11:18 PM
Replies: 85
Views: 5,671
Posted By tanhalt

As compared to a 23mm Vittoria though? Are you...

As compared to a 23mm Vittoria though? Are you saying that if you were to put a 23mm Vittoria on there it would result in lower aero drag?

In any case, what's the logic in testing a wheel with a...
11-02-10, 11:06 PM
Replies: 85
Views: 5,671
Posted By tanhalt

I thought it was on the Speedplay site...

I thought it was on the Speedplay site itself...but maybe it was somewhere else. I do remember discussing it with a bike industry aerodynamicist (i.e. someone with an actual degree in the field and...
11-02-10, 09:59 PM
Replies: 85
Views: 5,671
Posted By tanhalt

Actually...a close look at the data plot will...

Actually...a close look at the data plot will reveal the real reason that report was a "fail". I don't think they actually saw the difference they thought they saw ;-)
11-02-10, 09:57 PM
Replies: 85
Views: 5,671
Posted By tanhalt

Actually, the narrower than recommended tire on...

Actually, the narrower than recommended tire on that rim helped it's drag values, not hindered. It would have made more sense to test the wheels the way they would actually be used (if one didn't...
11-02-10, 06:53 PM
Replies: 85
Views: 5,671
Posted By tanhalt

Knowing that their wheels WILL be tested by 3rd...

Knowing that their wheels WILL be tested by 3rd parties, what incentive do they have to "gild the lily"?
11-02-10, 06:38 PM
Replies: 85
Views: 5,671
Posted By tanhalt

I understand what you're saying all too well,...

I understand what you're saying all too well, since I deal with FEA and CFD on a nearly daily basis. I'm just saying that just because you, Brian, and I don't always find it exactly EASY to do such...
11-02-10, 06:34 PM
Replies: 85
Views: 5,671
Posted By tanhalt

He's THIS guy: ...

He's THIS guy:
http://www.zipp.com/support/askjosh/askjosh.php

AKA "Zipp's Head of Engineering" :thumb:
11-02-10, 06:31 PM
Replies: 85
Views: 5,671
Posted By tanhalt

What? You don't trust me? :( Sheesh...I...

What? You don't trust me? :(

Sheesh...I point you guys to a veritable "mother lode" of interesting info and you make me spoon feed it to you? :rolleyes:

From another post later in that same...
11-02-10, 06:26 PM
Replies: 85
Views: 5,671
Posted By tanhalt

That might work...I could send you my narrow...

That might work...I could send you my narrow Jet90 with the Bonty Aerowing TT tire on it to run head to head against the C2 Jet 9. That would be the most "apples to apples" test. What tire would...
11-02-10, 06:07 PM
Replies: 85
Views: 5,671
Posted By tanhalt

Take it up with Mr. Poertner. ...

Take it up with Mr. Poertner.

http://forum.slowtwitch.com/gforum.cgi?post=3054556;search_string=;#3054556



Yes...they even do the simulations of the shedding behavior in CFD.
11-02-10, 05:52 PM
Replies: 85
Views: 5,671
Posted By tanhalt

It doesn't take much yaw for the back half of the...

It doesn't take much yaw for the back half of the wheel to be out of the wind shadow of the front of the wheel. Take a look at this vid by Zipp's Josh Poertner taken at Interbike. He shows a CFD...
11-02-10, 04:52 PM
Replies: 85
Views: 5,671
Posted By tanhalt

That might be possible...when are you going? It...

That might be possible...when are you going? It would be nice if the wheels were tested alone, but I'd settle for a comparison on the bike to a C2 Jet 9 with a 23c tire on it.




Don't get...
11-02-10, 04:30 PM
Replies: 85
Views: 5,671
Posted By tanhalt

I think you guys are looking for something like...

I think you guys are looking for something like Fig. 1 in this article...

http://img146.imageshack.us/img146/5936/trispokedesign.jpg
11-02-10, 03:24 PM
Replies: 85
Views: 5,671
Posted By tanhalt

I'm talking about width at the brake track, not...

I'm talking about width at the brake track, not the overall rim width...plus, you need to look at some of the stuff Zipp has done lately with the Firecrest models where they majority of the "gains"...
11-02-10, 03:18 PM
Replies: 85
Views: 5,671
Posted By tanhalt

Actually...fairly good CFD software (including...

Actually...fairly good CFD software (including rotating elements) is available currently that runs on PCs. No "supercomputers" needed ;-)
11-02-10, 03:16 PM
Replies: 85
Views: 5,671
Posted By tanhalt

What's wrong with 19mm?...there's an awfully good...

What's wrong with 19mm?...there's an awfully good tire out there still (for a short while, anyways) that works REALLY well on rims designed for that width of tire (think DuPont/Specialized/H3...
11-02-10, 12:11 PM
Replies: 85
Views: 5,671
Posted By tanhalt

Yup, as the guys at VN apparently discovered when...

Yup, as the guys at VN apparently discovered when they did their testing of the Stinger 9s.

And just recently I was told that the 2011 models will have a shallower tire bed to allow narrower than...
11-02-10, 10:26 AM
Replies: 85
Views: 5,671
Posted By tanhalt

IMHO it's basically all "hype" driven by the base...

IMHO it's basically all "hype" driven by the base assumption that everyone wants/needs to run a 23mm wide tire.

An "optimized" narrow tire/narrow rim will be faster at lower yaw angles, and no...
09-29-10, 09:46 AM
Replies: 190
Views: 12,407
Posted By tanhalt

One of the bigger issues is that most of the rear...

One of the bigger issues is that most of the rear of the fork brake implementations end up preventing a close fit between the front wheel and the downtube...
09-28-10, 04:34 PM
Replies: 190
Views: 12,407
Posted By tanhalt

Everything I've heard from "guys who should know"...

Everything I've heard from "guys who should know" is that putting the brakes on the back of the fork tends to create an "aero mess"...for various reasons. Not to mention, of course, that the current...
09-16-10, 04:59 PM
Replies: 146
Views: 5,322
Posted By tanhalt

Where's the breakpoint for you? Or, to put...

Where's the breakpoint for you?

Or, to put it in Cervelo parlance, the "Col de la Tipping Point?" (see the "Aero vs. Weight" tech presentation here:...
09-16-10, 04:55 PM
Replies: 146
Views: 5,322
Posted By tanhalt

Actually...I've been told by a few people who...

Actually...I've been told by a few people who should know that the main reason Sastre preferred the R3SL over the SLC was because he's got a "trick" back. The big thing for him was the better...
09-16-10, 04:51 PM
Replies: 146
Views: 5,322
Posted By tanhalt

Even if it ends up being slightly (i.e. 100-150...

Even if it ends up being slightly (i.e. 100-150 gm) heavier? Knowing how much of a weight weenie you are, I have a feeling that's not an easier question for you to answer ;)
09-16-10, 04:16 PM
Replies: 146
Views: 5,322
Posted By tanhalt

I was told by Specialized's full-time...

I was told by Specialized's full-time aerodynamicist (Mark Cote) at Interbike last year that one of the design requirements for the Shiv headheadtube/downtube was that it needed to be as stiff as an...
09-14-10, 03:20 PM
Replies: 59,818
Views: 2,375,176
Posted By tanhalt

That requirement is for the tubular wheels (i.e....

That requirement is for the tubular wheels (i.e. Stingers) and is because the rim is so wide and the rim bed so deep, the likelihood of rim damage with a tire smaller than 23c is pretty high (see the...
09-14-10, 03:15 PM
Replies: 59,818
Views: 2,375,176
Posted By tanhalt

Well, don't know about the 3s (yet)...but yeah,...

Well, don't know about the 3s (yet)...but yeah, the 40+ 1/2/3/4 races in SoCal are no "picnic"...
09-14-10, 03:14 PM
Replies: 59,818
Views: 2,375,176
Posted By tanhalt

Mine are actually the non-C2 Jet 90s...they just...

Mine are actually the non-C2 Jet 90s...they just have the newer Hed stickers on them. The narrow Jet 90s with Bontrager Aerowing TT 19C tires and latex tubes are "the cat's meow"...

If you get...
09-14-10, 03:06 PM
Replies: 59,818
Views: 2,375,176
Posted By tanhalt

Ha! If I showed you my "palmares" over the last...

Ha! If I showed you my "palmares" over the last few years and, more importantly, my FTP, I don't think "sandbagging" would quite be the word that immediately came to mind...probably more like...
09-14-10, 03:04 PM
Replies: 59,818
Views: 2,375,176
Posted By tanhalt

It's too bad TT's don't count for upgrade...

It's too bad TT's don't count for upgrade points...and in the 4s they don't even count stage race overalls, so you can't even use a TT as part of a stage race to try to grab some points. As of this...
09-14-10, 09:32 AM
Replies: 59,818
Views: 2,375,176
Posted By tanhalt

Danke!

Danke!
09-14-10, 09:02 AM
Replies: 59,818
Views: 2,375,176
Posted By tanhalt

Yup...tis I. I clocked a 27:34 over 20K. ...

Yup...tis I. I clocked a 27:34 over 20K. Exactly 27mph average. Good enough for first place in Cat 4/5 and a set of "flaming stopwatch" socks :D
...
Forum: Road Cycling
09-07-10, 01:27 PM
Replies: 86
Views: 3,422
Posted By tanhalt

It's "Violet" to YOU...

It's "Violet" to YOU...
Forum: Road Cycling
09-07-10, 10:22 AM
Replies: 86
Views: 3,422
Posted By tanhalt

Yep...after I lace it up into an appropriate rim,...

Yep...after I lace it up into an appropriate rim, it's going on my '86 Bianchi Sport SX :thumb:
Forum: Road Cycling
09-07-10, 10:01 AM
Replies: 86
Views: 3,422
Posted By tanhalt

Here's more detail in how you do it: ...

Here's more detail in how you do it:

http://blog.mitsukuni.org/2010/08/03/changing-slop-value-of-quarq-cinqo-en

I followed those instructions and ran quarqd on a Vista laptop by running Ubuntu...
Forum: Road Cycling
08-31-10, 06:07 PM
Replies: 67
Views: 3,171
Posted By tanhalt

If you're talking about me, you're wrong about...

If you're talking about me, you're wrong about that...oh, and "safer?"...gee, why did race officials commonly check how well racers tires were glued on the starting line back when tubulars where most...
Forum: Road Cycling
08-31-10, 06:04 PM
Replies: 67
Views: 3,171
Posted By tanhalt

I see folks doing that with tubulars all the...

I see folks doing that with tubulars all the time...what could possibly be the reason? I don't get it...
Forum: Road Cycling
08-31-10, 06:00 PM
Replies: 67
Views: 3,171
Posted By tanhalt

Sure you can...you just can't care about the...

Sure you can...you just can't care about the rim...just like Olano.

I find it funny that invariably this is the ONLY video that is ever trotted out when someone is talking about how you can "ride...
Forum: Road Cycling
08-31-10, 05:58 PM
Replies: 67
Views: 3,171
Posted By tanhalt

Why would I want compare those tires? If you're...

Why would I want compare those tires? If you're going to make the comparison, you might as well use good ones. How about if you roll on some Vittoria Corsa CXs and Open Corsa CXs (with latex tubes...
Showing results 1 to 50 of 772
 


 
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