Search: Posts Made By: beezaur
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11-06-12, 09:19 PM
Replies: 8,742
Views: 462,892
Posted By beezaur

Right . . . This kind of stuff is why I'm...

Right . . .

This kind of stuff is why I'm not going to get into a technical discussion on this site. If you want to go fight with someone over stuff that is totally foreign to you, go find...
11-06-12, 08:24 PM
Replies: 8,742
Views: 462,892
Posted By beezaur

Go look up the information in the links I...

Go look up the information in the links I provided. There are dozens and dozens of studies there.

To reiterate, here is the fact of the matter about helmet foam:

Some helmets use softer foam...
11-06-12, 08:14 PM
Replies: 8,742
Views: 462,892
Posted By beezaur

I never claimed to be a certified ski anything. ...

I never claimed to be a certified ski anything.

The 2/3 figure comes from long experience in doing similar materials testing and analysis. Do you have any experience with energy calculations and...
11-06-12, 11:32 AM
Replies: 8,742
Views: 462,892
Posted By beezaur

I saw that one, but couldn't get info on whether...

I saw that one, but couldn't get info on whether it was CPSC 1203 (US bicycle helmet) certified. I went with the plain old Receptor +.

Given my current point of view on the subject, I'm sure...
11-06-12, 12:12 AM
Replies: 8,742
Views: 462,892
Posted By beezaur

I have the benefit of extensive special training....

I have the benefit of extensive special training. I can identify bogus math right away. Likewise for structural and dynamical aspects of these kinds of physical systems.

You won't have to be an...
11-05-12, 09:45 PM
Replies: 8,742
Views: 462,892
Posted By beezaur

What I meant by that was I am not going to...

What I meant by that was I am not going to attempt to "prove" anyone's study's validity. You would need a year of math for that, and I'm not even going to attempt.

The way I look at things,...
11-05-12, 09:40 PM
Replies: 8,742
Views: 462,892
Posted By beezaur

I reviewed numerous test standards, especially...

I reviewed numerous test standards, especially the one used in the US. I also studied up on the actual materials in my helmet. There is a lot of information I looked through on tests that actually...
11-05-12, 07:19 PM
Replies: 8,742
Views: 462,892
Posted By beezaur

My opinion is based on a whole lot of things I'm...

My opinion is based on a whole lot of things I'm not going to get into. Short answer: your guess is wildly inaccurate.

If you are actually interested in understanding bicycle helmet safety, I...
11-05-12, 05:09 PM
Replies: 8,742
Views: 462,892
Posted By beezaur

Here is what happened to me a couple of months...

Here is what happened to me a couple of months ago:

I was riding along about 20 mph when a kid (salmon) popped out and hit me. I was knocked off my bike and landed head-first on pavement. Broken...
11-05-12, 09:44 AM
Replies: 8,742
Views: 462,892
Posted By beezaur

You've been badly misled. Helmets do not...

You've been badly misled.

Helmets do not protect against minor concussion by design. They don't even start deforming until you get to impacts that would cause major injury. Here is a set of...
10-15-12, 09:06 PM
Replies: 8,742
Views: 462,892
Posted By beezaur

Hey, knock yourself out (literally). I just...

Hey, knock yourself out (literally).

I just had a crash a month ago that left me with serious injuries from my head impacting pavement. Wasn't even going very fast. Had I not been wearing a...
10-14-12, 08:49 PM
Replies: 31
Views: 1,481
Posted By beezaur

Since this thread is going, I'll ask here: ...

Since this thread is going, I'll ask here:

What would you guys say is the safest helmet for road riding?

I am recovering from some serious injuries, and will be replacing my helmets.

I'm a...
09-04-12, 12:44 AM
Replies: 25
Views: 2,425
Posted By beezaur

The vast majority of bicycles sold now (including...

The vast majority of bicycles sold now (including mine) come equipped with the modern, lightweight aluminum alloy drop handlebars. Those which are not configured for road racing are structurally...
09-03-12, 07:40 PM
Replies: 25
Views: 2,425
Posted By beezaur

You guys really have never heard this before,...

You guys really have never heard this before, have you.

I found the book where I first read this. It is by Zinn, Zinn and the Art of Triathlon Bikes. On page 258 it has a section called...
09-03-12, 07:15 PM
Replies: 25
Views: 2,425
Posted By beezaur

Gawd you guys are rude. The first time I...

Gawd you guys are rude.

The first time I read about modern racing handlebars needing to be replaced (not 20-30 year-old bars - those are a whole other animal) it was in a maintenance book by Zinn...
09-03-12, 03:44 PM
Replies: 25
Views: 2,425
Posted By beezaur

Where does that come from? There is ample...

Where does that come from?

There is ample evidence that normal aluminum handlebars do not stand up.

The normal, and manufacturer-recommended practice is to preemptively replace the handlebars...
09-03-12, 03:01 PM
Replies: 25
Views: 2,425
Posted By beezaur

Thanks for the steel bullhorn idea. I found...

Thanks for the steel bullhorn idea.

I found that Nitto makes them in stainless, but they have closed welded ends. And they are small diameter.

Is it fair to hotlink to images posted on BF? ...
09-03-12, 02:08 PM
Replies: 25
Views: 2,425
Posted By beezaur

A search on this forum for "handlebar failure." ...

A search on this forum for "handlebar failure."

I ride ~4500 miles per year, none of it racing. I have zero need for uber-lightweight handlebars that regularly fail in fatigue.
09-03-12, 12:01 PM
Replies: 25
Views: 2,425
Posted By beezaur

Strong Handlebars?

I'm getting ready to pre-emptively replace my handlebars, and am looking for something stronger.

What I have now is regular drops with clip-on aero bars.

I'm 190 lbs and spend about half my...
09-03-12, 11:11 AM
Replies: 150
Views: 11,226
Posted By beezaur

It's an immature technology. You can bet the...

It's an immature technology. You can bet the issue will be resolved in the future.

I have to put my skewer on absurdly tight to keep my wheel from pulling out against the lawyer lips.

Think...
08-21-12, 10:14 PM
Replies: 21
Views: 1,721
Posted By beezaur

Thanks everyone. I'm leaning toward Edelux...

Thanks everyone.

I'm leaning toward Edelux in front and the B&M rear that does the brake light thing.

This is going to be such an improvement over what I have now.
08-21-12, 12:01 AM
Replies: 21
Views: 1,721
Posted By beezaur

Dyno Light for Fast Rural Riding?

I'm getting ready for a SON dynohub, and am sort of lost on the lights.

I ride pretty much every day, all weather. I am in a rural setting, small town. My daily ride is 11 miles on hilly country...
08-20-12, 07:46 PM
Replies: 18
Views: 1,355
Posted By beezaur

Thanks. I looked at those, but I have lots of...

Thanks. I looked at those, but I have lots of hills (7-8 mph with groceries) in between some flats (22+ mph).

Sounds like a good idea for one or two of my older bikes though . . .
08-19-12, 10:51 AM
Replies: 18
Views: 1,355
Posted By beezaur

Yeah, I'd like to put in a Rohloff, but they are...

Yeah, I'd like to put in a Rohloff, but they are a bit spendy for the moment.

Thanks for all the info, guys. No Phil Wood hub recommendations?
08-18-12, 07:33 PM
Replies: 18
Views: 1,355
Posted By beezaur

Building a Wheelset for SON Dynohub

Figured I would jump into the deep end of the pool and build myself a wheelset for my year-round commuter cross bike. It will use a SON dynohub.

My problem is I am unfamiliar with all the various...
06-24-12, 02:35 PM
Replies: 3
Views: 7,399
Posted By beezaur

Thanks much. The cups actually have never...

Thanks much.

The cups actually have never been removed, only tightened a couple of times. I'm certain they aren't cross threaded, at least not by me. The damage I did was to mash in the outside...
06-24-12, 01:09 PM
Replies: 3
Views: 7,399
Posted By beezaur

FSA MegaExo BB Questions

I think I damaged by BB and want to make sure I understand what I have before I try to fix it.

The problem is, the BB was loose, so I tried to tighten it with a Pedro's tool that didn't fit well,...
06-21-12, 12:34 PM
Replies: 3
Views: 2,183
Posted By beezaur

Are there any steel chainrings that would work...

Are there any steel chainrings that would work (ss or otherwise)?
06-21-12, 12:25 PM
Replies: 3
Views: 2,183
Posted By beezaur

Surly SS Chainrings and 10-Speed Chain?

So . . . I have two in front (34T and 50T, 110 BCD) and 10 in back, was wondering if I can use these Surly stainless chainrings:

http://surlybikes.com/parts/stainless_steel_chainrings

They...
06-18-12, 02:19 PM
Replies: 7
Views: 773
Posted By beezaur

Yes, this is my main concern. This will be a...

Yes, this is my main concern.

This will be a permanent modification.
06-18-12, 01:10 PM
Replies: 7
Views: 773
Posted By beezaur

Thanks. I didn't know if there was some sort...

Thanks.

I didn't know if there was some sort of a standard that would guarantee compatibility between brands. If there's not, I'm not going to chance it.
06-18-12, 12:40 PM
Replies: 7
Views: 773
Posted By beezaur

Shimano Links in a KMC Chain?

Just thought I'd ask on the outside chance this might work:

I have a trike with a new-ish KMC chain (XSP X9) that is too short, and a new Shimano chain (HG53), both 9-speed. Pins are Shimano.
...
04-22-12, 10:47 PM
Replies: 41
Views: 1,678
Posted By beezaur

On wheels with disc brakes? The issue is...

On wheels with disc brakes?

The issue is not skewers on wheels with rim brakes. The issue is a skewer that is installed tight enough to hold a disc brake-equipped front wheel in place. That is...
04-22-12, 07:54 PM
Replies: 41
Views: 1,678
Posted By beezaur

Okay, that's the kind of information I'm looking...

Okay, that's the kind of information I'm looking for. Thanks.
04-22-12, 06:52 PM
Replies: 41
Views: 1,678
Posted By beezaur

I found three on the first page of a Google...

I found three on the first page of a Google search:

http://www.bikeradar.com/forums/viewtopic.php?p=16763313

http://forums.bicycletutor.com/thread-2780.html
...
04-22-12, 06:44 PM
Replies: 41
Views: 1,678
Posted By beezaur

Measure the force. You'd be surprised. A...

Measure the force. You'd be surprised.

A skewer with a smaller cam will apply even more force, possibly by a factor of two.
04-22-12, 06:42 PM
Replies: 41
Views: 1,678
Posted By beezaur

No, but that doesn't matter for the tensile...

No, but that doesn't matter for the tensile stress in the skewer.

@HillRider: Loading (and thus stress) is changed with every bump and brake application, not to mention vibration and potentially...
04-22-12, 05:55 PM
Replies: 41
Views: 1,678
Posted By beezaur

So, I did the calculation . . . My lever is...

So, I did the calculation . . .

My lever is 2.0" long, and the cam surface is 0.3" from its axis. So the force that I apply on the lever (conservatively) is magnified by a factor of ~6.7.

If I...
04-22-12, 05:28 PM
Replies: 41
Views: 1,678
Posted By beezaur

That's sort of what I'm trying to figure out -...

That's sort of what I'm trying to figure out - what to do about the problem.

I haven't done the calculations yet, but there is potentially an issue with fatigue or some similar phenomenon with a...
04-22-12, 10:20 AM
Replies: 41
Views: 1,678
Posted By beezaur

Yes, that's the bike. So, a through axle...

Yes, that's the bike.

So, a through axle would be safer than a Shimano skewer?
04-22-12, 01:42 AM
Replies: 41
Views: 1,678
Posted By beezaur

Safer, but is that safe enough? Reading...

Safer, but is that safe enough?

Reading through the likes of this (http://www.ne.jp/asahi/julesandjames/home/disk_and_quick_release/index.html#unscrewing) it would seem I've been flirting with...
04-22-12, 12:50 AM
Replies: 41
Views: 1,678
Posted By beezaur

Thanks for the links. Would a non-QR skewer...

Thanks for the links.

Would a non-QR skewer be safer?
04-21-12, 11:14 PM
Replies: 41
Views: 1,678
Posted By beezaur

Here is the left side front dropout: 245952 ...

Here is the left side front dropout:
245952

and the QR:
245953
04-21-12, 11:00 PM
Replies: 41
Views: 1,678
Posted By beezaur

Right. I'm getting the nut on the other side as...

Right. I'm getting the nut on the other side as tight as it will go and still be able to lever the thing closed. The lever goes through about 90 degrees of rotation between contact and all the way...
04-21-12, 10:48 PM
Replies: 41
Views: 1,678
Posted By beezaur

Everything seems fine and in good working order,...

Everything seems fine and in good working order, a little dirty from the winter's riding though.

The QR has an eccentric cylinder that the lever sticks into, both aluminum. The part that engages...
04-21-12, 10:13 PM
Replies: 41
Views: 1,678
Posted By beezaur

Tricross Front Wheel Pulls Out When Braking

I have a Specialized Tricross with disc brakes, new last summer, with 2700 road miles on it. It's my commuter.

I'm riding along today, looking down at the wheel and notice it's to the left maybe...
10-02-11, 08:01 PM
Replies: 9
Views: 648
Posted By beezaur

+1 on both. Nutrition and body maintenance...

+1 on both.

Nutrition and body maintenance are HUGE parts of having good athletic ability.

I would stay away from the engineered foods on the nutrition. Get something by a reputable dietitian...
10-02-11, 07:50 PM
Replies: 18
Views: 815
Posted By beezaur

This is just a potential rule-out, but worth a...

This is just a potential rule-out, but worth a thought:

How is your flexibility?

I was going along fine, riding strong on a relatively high-mileage schedule when all of a sudden I started...
10-02-11, 07:41 PM
Replies: 4
Views: 916
Posted By beezaur

IGA (http://www.iga.com/consumer/default.aspx). ...

IGA (http://www.iga.com/consumer/default.aspx). But first you need to read something like this (http://www.nancyclarkrd.com/books/sportsnutrition.asp).
10-02-11, 07:25 PM
Replies: 22
Views: 1,808
Posted By beezaur

Sounds like an electrolyte imbalance or something...

Sounds like an electrolyte imbalance or something like that.

If you are not used to processing a lot of calories and fluids and things it is pretty easy for your body chemistry to get out of...
Showing results 1 to 50 of 257
 


 
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