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#617900 - 09/01/07 02:53 PM
Re: Know that if you do not post in this thread today the human race may cease to exist
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Anonymous
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Maybe this will keep the thread alive...
You have two tires, they exactly the same in all regard except for width. As an example tire 1 is a 33x10.5R15@30psi and tire 2 is 33x12.50R15@30psi same brand and both are on the same vehicle (at different times... duh).
Which tire has a larger contact patch?
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#617901 - 09/01/07 02:56 PM
Re: Know that if you do not post in this thread today the human race may cease to exist
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Anonymous
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Originally posted by Chris Ritchey: Which tire has a larger contact patch? I am guessing the one that are not mounted since they are probably laying flat.
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#617902 - 09/01/07 03:07 PM
Re: Know that if you do not post in this thread today the human race may cease to exist
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Member
Registered: 19/07/01
Posts: 2032
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This thread contains all of XOC's stupidest posters.
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#617903 - 09/01/07 03:09 PM
Re: Know that if you do not post in this thread today the human race may cease to exist
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Anonymous
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Well, now it does. ![laugh laugh](/forums/images/graemlins/default/laugh.gif)
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#617904 - 09/01/07 03:10 PM
Re: Know that if you do not post in this thread today the human race may cease to exist
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Anonymous
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#617905 - 09/01/07 03:10 PM
Re: Know that if you do not post in this thread today the human race may cease to exist
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Anonymous
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Originally posted by 56kz2slow: Originally posted by Chris Ritchey: [b]Which tire has a larger contact patch? I am guessing the one that are not mounted since they are probably laying flat.[/b]I said they were on the same vehcile and had air in them, the @30spi, the ones not mounted would only have 0psi in them (well technically I think it's 14.5psi @ sea level. Originally posted by Smith: This thread contains all of XOC's stupidest posters. Don't you mean dumbest? Or maybe he's using the slang version: 6. Slang. excellent; terrific.
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#617906 - 09/01/07 04:44 PM
Re: Know that if you do not post in this thread today the human race may cease to exist
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Anonymous
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You did say at different times, so if they are on at different times, it means they are not always on.
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#617908 - 09/01/07 06:44 PM
Re: Know that if you do not post in this thread today the human race may cease to exist
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Anonymous
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How wide is the tread mill? Is it made by Shrock? Or one of the other guys?
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#617909 - 09/01/07 07:08 PM
Re: Know that if you do not post in this thread today the human race may cease to exist
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Anonymous
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Originally posted by 56kz2slow: You did say at different times, so if they are on at different times, it means they are not always on. Fine I'll accept that, but it's not the right answer answer so it doesn't matter ![smile smile](/forums/images/graemlins/default/smile.gif)
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#617910 - 09/01/07 07:09 PM
Re: Know that if you do not post in this thread today the human race may cease to exist
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Registered: 23/03/01
Posts: 1906
Loc: San Jose, CA
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Originally posted by Chris Ritchey: You have two tires, they exactly the same in all regard except for width....Which tire has a larger contact patch? I was going to guess the wider tire, but... given the same tire pressure and weight on each tire, the extra width of the contact patch will compensate for extra length of contact patch that was needed on the narrower tire. The exact answer, though, probably depends on the particular tire characteristics. ![](http://www.xplorx4.com/pathfinder/contactpatch.gif)
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#617911 - 10/01/07 08:58 AM
Re: Know that if you do not post in this thread today the human race may cease to exist
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Anonymous
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Originally posted by XPLORx4: Originally posted by Chris Ritchey: [b]You have two tires, they exactly the same in all regard except for width....Which tire has a larger contact patch? I was going to guess the wider tire, but... given the same tire pressure and weight on each tire, the extra width of the contact patch will compensate for extra length of contact patch that was needed on the narrower tire. The exact answer, though, probably depends on the particular tire characteristics.
[/b]Yeah, that's pretty much it... oh well I was hoping for more debate, discussion and people that just couldn't get it Same psi = ~ same contact area, the skinny might have a slightly smaller area because there is more deflection from the sidewall. So if both tires were the same then the sidewall characteristics would be ~ the same, except for the amoutn of deflection.
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#617912 - 10/01/07 09:43 AM
Re: Know that if you do not post in this thread today the human race may cease to exist
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Anonymous
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Are the load ratings the same for the tires? If not, then their sidewalls will act differently at the same PSI.
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#617913 - 10/01/07 09:57 AM
Re: Know that if you do not post in this thread today the human race may cease to exist
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Member
Registered: 05/07/02
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Who pissed on Lizzadie's Sandwich?
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#617914 - 10/01/07 10:01 AM
Re: Know that if you do not post in this thread today the human race may cease to exist
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Anonymous
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Originally posted by Claus: Who pissed on Lizzadie's Sandwich? x2
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#617915 - 10/01/07 12:54 PM
Re: Know that if you do not post in this thread today the human race may cease to exist
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Registered: 24/08/01
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Hurray!
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#617916 - 10/01/07 03:32 PM
Re: Know that if you do not post in this thread today the human race may cease to exist
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Anonymous
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Yes please ![laugh laugh](/forums/images/graemlins/default/laugh.gif)
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#617917 - 10/01/07 03:38 PM
Re: Know that if you do not post in this thread today the human race may cease to exist
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Anonymous
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This new 'Contact Patch' scenario makes me want to argue tho! Keep the thread alive! lol.
Why would a wider tire have a shorter contact patch. If they are the same PSI and the same diameter, doesn't seem to make any sense to me.
Is the only difference the width of the tire, or am I missing something there? If the width of the tire is the only difference, then I don't see why the length of the contact patch would be any different if they are both the same diameter. Which would mean the wider tire would have the larger contact patch.
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#617918 - 10/01/07 04:02 PM
Re: Know that if you do not post in this thread today the human race may cease to exist
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Anonymous
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Originally posted by porsche996: Are the load ratings the same for the tires? If not, then their sidewalls will act differently at the same PSI. Same tire in all regards, including load rating. Although I admit I'm not a tire expert so I'm not sure how the determine the load rating. If it's determined by the sidewall stiffness then a tire with a higher load rating would have a smaller contact patch than the exact same tire with a lower load rating.
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#617919 - 10/01/07 04:09 PM
Re: Know that if you do not post in this thread today the human race may cease to exist
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Member
Registered: 23/03/01
Posts: 1906
Loc: San Jose, CA
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Originally posted by RiNkY: This new 'Contact Patch' scenario makes me want to argue tho! Keep the thread alive! lol.
Why would a wider tire have a shorter contact patch. If they are the same PSI and the same diameter, doesn't seem to make any sense to me. Same load, same tire pressure= same surface area: http://auto.howstuffworks.com/question506.htm
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#617920 - 10/01/07 09:54 PM
Re: Know that if you do not post in this thread today the human race may cease to exist
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Anonymous
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OK-I got lost several pages back. So, dude, where's my car?
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#617921 - 11/01/07 03:55 AM
Re: Know that if you do not post in this thread today the human race may cease to exist
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Registered: 25/08/02
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Loc: RVA
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Sweeeeeeeeeet :p
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#617922 - 11/01/07 05:20 AM
Re: Know that if you do not post in this thread today the human race may cease to exist
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Member
![*](/forums/images/general/default/star.gif) ![*](/forums/images/general/default/star.gif) ![*](/forums/images/general/default/star.gif) ![*](/forums/images/general/default/star.gif)
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The above psi and diameter rule of thumb does not always apply.
For example, to take it to the logical extreme to have proof of concept...
I have a 27" bicycle 1" wide racing tire tire, and a 27" truck tire...i put 30 psi in each, and load on 2,000 lb.
The bike tire contact patch is as flat and wide as its going to get, with a full inch of tread width by about a full inch of tread length, or, about 1 square inch of tread contact.
The truck tire will have perhaps a 8-10" wide patch, and it wil be MORE than 1/8" long...disproving the concept.
If you LOOK at the tread patterns of typical truck tires...and hold them side by side.....the taller tire has a longer tread patch than the shorter tire, and the fatter tire has a fatter tread patch.
Now, when we compare different aspect ratios...the tread change does do the length to width orientation flip shown.
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#617923 - 11/01/07 05:36 AM
Re: Know that if you do not post in this thread today the human race may cease to exist
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Anonymous
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TJ, I think they also assume same wheel diameter, but if you put both the bicycle and truck tire on a 25" wheel, your example still proves right. The fatter tire normally has a bigger contact patch, but fatter tires normally have less tire pressure. In the trivia question, both have the same tire pressure, so it's possible that it works out to the same. Time to try one of your chalk tests ![smile smile](/forums/images/graemlins/default/smile.gif)
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#617924 - 11/01/07 05:48 AM
Re: Know that if you do not post in this thread today the human race may cease to exist
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Originally posted by jaws_o_life: Sweeeeeeeeeet :p Duuuuuude! ![smile smile](/forums/images/graemlins/default/smile.gif)
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