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Are Presta valve caps uncool or what?

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Are Presta valve caps uncool or what?

Old 02-06-18, 10:16 AM
  #101  
ksryder
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This is a work in progress but we're almost there, people! Keep up the good work!

bfbingo.jpg
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Old 02-06-18, 10:25 AM
  #102  
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I remove BOTH. They are nothing but DEAD WEIGHT and DRAG.

Besides, are people seriously arguing caps are more Aero?? They at least DOUBLE the cross-section of the valve!
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Old 02-06-18, 10:26 AM
  #103  
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I like how fietsbob gets his own square.
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Old 02-06-18, 10:49 AM
  #104  
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5 pages about dust caps? Really?

Boggles the mind.
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Old 02-06-18, 10:54 AM
  #105  
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Originally Posted by ksryder
This is a work in progress but we're almost there, people! Keep up the good work!

Attachment 598366
Bingo ! ! !

What do I win?
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Old 02-06-18, 11:08 AM
  #106  
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Originally Posted by AlmostTrick
I like how fietsbob gets his own square.


Originally Posted by PdalPowr
Bingo ! ! !

What do I win?
What everyone who wins an argument on the internet gets: Intense feeling of well-being and contentment, adulation from friends and strangers alike, and the satisfaction of knowing that the matter has been put to rest and need never be raised again.
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Old 02-06-18, 11:16 AM
  #107  
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Originally Posted by Ogsarg
5 pages about dust caps? Really?

Boggles the mind.
Must be a slow day at work or the day after a Super Bowl hangover...

BTW as the OP I think I will choose to keep my cap on no matter what anyone else thinks...
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Old 02-06-18, 11:23 AM
  #108  
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Clearly the subject hasn't been covered enough previously.
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Old 02-06-18, 11:29 AM
  #109  
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Originally Posted by FBOATSB
Just for giggles, or because I was bored, I emailed a manufacturer of presta valve's and asked them their policy on caps and lock nuts. "Yes. We recommend to use cap. To avoid dust. And recommend to use locknut too. " So all you sloppy unkempt pin bending impaling death machine riding folks are going against manufacturer's recommendations. Good luck with your lawsuit
Locknuts don't really work too well with deep-wall rims. They don't sit flush with any rim actually, it's like there's a part missing.

Like a moulded plastic seat, similar in shape to some quick-release compression seats. Or they could at least texture/shape the compression surface of the washer, so that it bites into the alloy. Whatever, this is clearly an area that's seen very little in the way of development.
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Old 02-06-18, 12:13 PM
  #110  
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Originally Posted by ksryder
This is a work in progress but we're almost there, people! Keep up the good work!

Attachment 598366
forgot the square for > writing something from the company computer instead of the job you are paid to do<.





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Old 02-06-18, 12:38 PM
  #111  
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Originally Posted by MikeyMK
Locknuts don't really work too well with deep-wall rims. They don't sit flush with any rim actually, it's like there's a part missing.

Like a moulded plastic seat, similar in shape to some quick-release compression seats. Or they could at least texture/shape the compression surface of the washer, so that it bites into the alloy. Whatever, this is clearly an area that's seen very little in the way of development.
The valve and rim manufacturers need to step up here. We know (from the innertube people) that the locknuts are important but we also all know they sit very poorly on the rime surface (like they are not so important) and scratch that pristine rim surface if tightened enough to stay on through all the vibration a rim gets.

So, get with it! Offer us some properly shaped plastic washers that will fit flush with both the complex curved surface of the rim and the lockwasher. Yes, you will have to provide quite a few variations because rims vary so much, but ... it is you who are telling us this is important. And isn't it your obligation to provide us the means to install these critical parts without damaging the finish of our $1000 wheels? (These washers probably need to have wrench flats so they can be held in proper alignment with the rim. Perhaps a small wrench could be included.)

With these washers, properly installed, we will finally be able to have wheels done right. No gaps under the edges of the lock nuts and no scarred anodizing.

Ben
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Old 02-06-18, 12:41 PM
  #112  
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Originally Posted by shafter
They at least DOUBLE the cross-section of the valve!
Look at aeronautics. Shape and surface texture are far more important than actual size.

Notice that the threading on a valve closely resembles the fins of an automobile radiator? What is the purpose of an automobile's radiator fins? To catch air.

Bikes with no valve caps are suffering extreme aero penalties, and therefore experiencing significant speed losses.

Again. Any serious cyclist worth his salt (should) understands the performance benefits of a light weight and efficiently shaped valve cap. There are a lot of folks out there with no real understanding of the actual physics involved. It's not their fault. They are neither engineers nor physicists. But don't allow yourself to be fooled by the naive and unsophisticated.

Last edited by SquidPuppet; 02-06-18 at 12:48 PM.
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Old 02-06-18, 12:43 PM
  #113  
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Originally Posted by ksryder
This is a work in progress but we're almost there, people! Keep up the good work!

Attachment 598366
This must be maintained and updated.
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Old 02-06-18, 12:51 PM
  #114  
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Originally Posted by ksryder




What everyone who wins an argument on the internet gets: Intense feeling of well-being and contentment, adulation from friends and strangers alike, and the satisfaction of knowing that the matter has been put to rest and need never be raised again.
You are right.
The only thing I need to raise is my hat when I tip it to you.
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Old 02-06-18, 12:55 PM
  #115  
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Originally Posted by FBOATSB
Just for giggles, or because I was bored, I emailed a manufacturer of presta valve's and asked them their policy on caps and lock nuts. "Yes. We recommend to use cap. To avoid dust. And recommend to use locknut too. " So all you sloppy unkempt pin bending impaling death machine riding folks are going against manufacturer's recommendations. Good luck with your lawsuit
Can we buy valve caps with sleeves that go all the way down to the rim? It's not that I mind carefully wrapping my valve stems with vinyl tape to protect the threads. And for UV protection for the plastic part, on those Schraeder valves. It's just that it gets ratty after a ride or two and torn at the bottom (go all the way down so you don't get that dreadful CLACK going over bumps). Also, to get the end just right I really need to wrap the valve stem before putting the tube in and that's getting kind of old.

A long cap would stay looking nice I think, and if it could slide over the lock-ring at the bottom that would be a bonus.
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Old 02-06-18, 01:28 PM
  #116  
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Send me your valve caps!!!
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Old 02-06-18, 01:28 PM
  #117  
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Originally Posted by wphamilton
Can we buy valve caps with sleeves that go all the way down to the rim? It's not that I mind carefully wrapping my valve stems with vinyl tape to protect the threads. And for UV protection for the plastic part, on those Schraeder valves. It's just that it gets ratty after a ride or two and torn at the bottom (go all the way down so you don't get that dreadful CLACK going over bumps). Also, to get the end just right I really need to wrap the valve stem before putting the tube in and that's getting kind of old.

A long cap would stay looking nice I think, and if it could slide over the lock-ring at the bottom that would be a bonus.
https://www.thingiverse.com/thing:1950891
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Old 02-06-18, 01:29 PM
  #118  
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Originally Posted by canklecat
Awright, guys, I just removed the caps and nuts from my Presta valves...
Pics or it didn't happen!
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Old 02-06-18, 01:38 PM
  #119  
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Originally Posted by FBOATSB
Too ugly Any that just look like normal valve caps, but long?
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Old 02-06-18, 01:42 PM
  #120  
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Originally Posted by SquidPuppet
Look at aeronautics. Shape and surface texture are far more important than actual size.

Notice that the threading on a valve closely resembles the fins of an automobile radiator? What is the purpose of an automobile's radiator fins? To catch air.

Bikes with no valve caps are suffering extreme aero penalties, and therefore experiencing significant speed losses.

Again. Any serious cyclist worth his salt (should) understands the performance benefits of a light weight and efficiently shaped valve cap. There are a lot of folks out there with no real understanding of the actual physics involved. It's not their fault. They are neither engineers nor physicists. But don't allow yourself to be fooled by the naive and unsophisticated.
Is this aero?


Is this "Da Bomb?
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Old 02-06-18, 01:42 PM
  #121  
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Wouldn't the optimal valve cap be tear drop shaped, in the direction of rotation?
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Old 02-06-18, 01:43 PM
  #122  
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Rydabent should get a square for each of his oft-repeated posts.
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Old 02-06-18, 01:55 PM
  #123  
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Sometimes the top of it is headed into the wind, sometimes the side, or the bottom. The transition from the valve cap to the stem might be the most important part of the shape. Regular caps that have flat bottoms, a lot of turbulence (=drag) there. I'd be taping that part up also, except that it's a pain to redo it every time you top off the air.
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Old 02-06-18, 02:06 PM
  #124  
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Look why don't we just invent tires inflated by politicians breath.
That way they will never deflate so we won't need valves at all.
As we all know there is no end to a politician's hot air.
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Old 02-06-18, 02:12 PM
  #125  
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Originally Posted by wphamilton
Sometimes the top of it is headed into the wind, sometimes the side, or the bottom. The transition from the valve cap to the stem might be the most important part of the shape. Regular caps that have flat bottoms, a lot of turbulence (=drag) there. I'd be taping that part up also, except that it's a pain to redo it every time you top off the air.
Is this what I think it is? Or not, I have not seen one.
Maxxis Presta Valve Stems and Core Removal Tool - Black - Ultimate Cycle Store
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