I'm curious why, since this is your thread, you can't find the above data?

 

http://www.reference.com/browse/Inner_tube

Sipe
Tread lugs often feature small narrow voids, or sipes, that improve the flexibility of the lug to deform as it traverses the footprint area. This reduces shear stress in the lug and reduces heat build up. Sipes also provide greater traction in icy conditions.

http://www.patentstorm.us/patents/6695023/fulltext.html

Abstract
In a pneumatic tire comprising a tread which comprises a row of a plurality of blocks divided in the circumferential direction of the tire, a closed sipe is disposed at an approximately central portion of the block and is inclined in a direction opposite to a direction of transverse grooves with respect to an axial direction of the tire. Improved performance in driving on wet roads can be exhibited due to the transverse grooves and the closed sipes. Because the closed sipe is disposed at an approximately central portion of the block, pressure from the road surface can be dispersed to both sides of the closed sipe, and high pressure from the road surface at the central portion of the block can be reduced. Because the closed sipe is disposed so as to be inclined in the direction opposite to the direction of the transverse grooves with respect to the axial direction of the tire, sufficient rigidity of the block can be maintained, deformation at a time of contact with the road surface can be suppressed, and rolling resistance can be reduced.

 

I'm beat from using a manual tire changer .. so I'm going to keep this simple and then bow out of the thread.



A) A Nascar/Formula one tire has "no tread" to maximize contact patch. Obviously, we cannot have that for the street. That woudl be why no sipes are needed on these tires. No tread blocks to concern ourselves with. So we use the size and shape of a tread block to determine what characteristics we wish the tire to exhibit. And like 4.3 said .... the sipes are another determining characteristic.


B) I just simply used the picture as a demonstration because typing long drawn out answers does nothing useful on this board. The DW thread post I put up is an excellent example. Took me all of 40 seconds to type it ... nothing to do with using comics. I'm guessing it probably took you every bit of 20 min to type that all up (if not more)


C) Not everyone uses their tire for "mud" I suppose I would have to agree there is more potential for liquid earth to get into the sipes and do squat. But for those that pay with granite ... I feel there is an edge to gain


D) I'm the last person to "go for the hype" .... my expiraments are simple in every manner. I agree they aren't "by the book" repeatable, but they are sufficient for me. What's my test? Take an almost worn set of tires and sipe them. Put them back on the road (best conducted in winter time, obviously). Not one person has remarked that they didn't notice an improvement (even spouses that didn't know the work was done -- my own wife is a good example).


E) Air is an isulator, yes. But it can conduct some thermal energy. Particularly if the air is cooler than the object it is in contact with. Extreme example here --- weld up an axle tube/centersection. Cover it so the exposed metal doesn't cool to quickly in the air (thereby cracking welds). On a super duper simplified scale, that is what I am implying here.



This post took me 3 minutes to type and I'm going to grab a lemonade. Help yourself to whatever beer, wine, or soda you wish.


I *think* I'm done with this thread.



Joe

 

Found this as well.



I could care less at this point (note to self ... don't try to type after manually changing tires). But this might help or hurt both sides of the argument depending on how the info can be bent to suit purposes.


http://www.sipers.com/sipers/siping_tests.asp#



There is a basic (press release) and scientific copy on that link for anyone that wishes to read into it.

 

ermmm wow you lot is clever

 

Oh yes ,they cause the tire to have forces along the vertical axis, as if you were drifing on a ladder.
And a "couple" of other things too.
Siping=more spaces.
Vibration yes, more deformation absolutely no, on a champion surface of 1x1 inches the non siped block has more rigidity.
Of course, if you add siping even faster.
I have accounted that, reread carefully. Anyway more edges=more scraping.

That's what i am saying.
.
No, the deformation of the summatory of mini blocks is bigger than the big block, that is the principle of siping to expose more edges and grab better on wet or snowy surfaces.

 

The world is governed by changing constants.
You need to come up with some maths if you want to tell me what to do.

 

you fell into contradiction
This is against every law of phisics, therefore bull****.

 

Why? i like playin hard.



True, but the main reason is to let them last at least half race.


Hahaha, exagerated...

well sorry, i'm not used to timing my typing, since English is not my first language, it is quite difficult to think in my language and write in English.
Try to write a post like that in Italian or whatever other language you might know, and take the timing.


true, i agree, but again, the topic is wear.


Same as above, i agree but not pertinent to our topic.


Very little
Hahaha, the main heat flow that provides cooling of a weld is through the attached metal that is a very good conductor. If your weld cracks it is probably bad setting of the welder or non chamfering the parts.
If you make big welds on small-thin parts they will crack, this can be avoided by welding more times on the same point with less wire, waiting for cooling in between.


3 minutes?? all that time....
Beer, and a special beverage made out of almonds that looks like milk here, thanks.

Don't think too much or you will never finish your build
Will you have it done for Moab2010?
I'm impatient to face you on the trails, hehehe..

 

I have seen very little of it but I will go ahead.

Let not have any personal attacks. I don't want to close a thread with good discussion but I will if anything becomes personal.

 

I think I am done here too. Nothing is being accomplished. I am just going out to the shop now and telling my tires they are being thrown out because they are really worn out.

 

hahaha, we are all friends, right?
don't tell that to your tires 4.3xj, they will get upset, poor scarred tires... lol

 

Stryker ... I doubt there will be any personal attacks. I normally enjoy these types of threads. It's not my fault fantic is a nerd.



At this point I think we are start to go off topic from the original argument and we're all losing focus on what we are arguing about. So I think the thread should really end at this point anyways.


*MY* argument is that the sipes do create additional winter & rock traction with the additional biting edges. I'm also a proponent that the sipes do help the tire last longer for normal street driving.


That said ....


Type it up in Italian and then translate it in Babel fish. Should be faster, no?






I used that specific analogy because the cast cools at a different rate than the mild steel. And such, has the potential to crack as they cool down in open air. That's why I said wrapping it up .. because the air around it is cooling it. But no .. you hadda go and give other reasons why welds crack and get us off topic again.




Yah yah yah. No need to get personal.



Physics & Engineering definitely have their place in this sport ... but sometimes I think it gets too ingrained instead of just "doing it" An example would be how people focus on the 4 link calculator too much. They use it as gospel when it's nothing more than a tuning tool. And sometimes, what the numbers say won't work, does. The bumble bee is a great example.



4 tires mounted & inflated ! Crossmember done (for now). Time to shimmy the axle in place temporarily !!!




Joe

 

Not more than you my friend hehe, i knew you were a masochist
Impossible, it doesn't translate all the tech stuff correctly, and i don't cheat with my knowledge.

.
yes i couldn't resist, it was too silly for my nerdity, haha, i admit it, i went off topic once.

What about what you just wrote above?



Both skills is better



moab2010...

 

It was self defense.




Sooner or later I'll start the build thread on the Jeep. In the mean time ... just hold on to your horses.



Joe