Sand Tires And Roll Out - Page 2 - Suzuki LT-R450 Forum :: LTR450HQ.com
Wheels/Tires A perfect tire/wheel combination is a necessity, discuss tires and wheels here

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post #11 of 42 (permalink) Old 06-19-2008, 06:31 AM
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<div class='quotetop'>QUOTE (08LTRSMOKINYOU @ Jun 18 2008, 09:30 PM) <{POST_SNAPBACK}></div>
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your way off on that one...about the rollout not being affected at higher speeds[/b]

that is very possible, but i do that that with stock transmission gears and stock sprockets, if the motor is spinning at 9500 rpm the rear tire is spinning at ~1420 rpm in 5th gear, and for that motor rpm the tire rpm is gonna be lower for every gear below 5th, and have a 13t front sprocket will make the tire rpm lower as well. 1400 rpm just doesn&#39;t seem like alot, though this doesn&#39;t take into account to forces from accelerating to that speed because determining an accurate angular acceleration of the rear wheel would suck.

all in all what i&#39;m trying to say is to either side of this with a grain of salt because there are so many variables.
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post #12 of 42 (permalink) Old 06-19-2008, 08:27 AM
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its not really about the rpms that is makin the tire balloon out...its the speed that the tire is spinning...at 20 mph the rollout will be less then when at 60mph...someone correct me if im wrong...but im pretty sure this is how it works...

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post #13 of 42 (permalink) Old 06-19-2008, 09:39 AM
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that&#39;s 100% correct, i was just using the rpms as an example instead of the linear speed. 1420 tire rpms is ~75 mph with 18 rear wheels, or 84 mph with 20" tires (neglecting all fricational effects), which the 20" would have more dynamic runout with the same size rims, or if you put larger rims on the 20&#39;s than the 18&#39;s you could theoretically get the same additional runout over the static measurement for each size.

anyways, sorry if my wording isn&#39;t coming across very well, i&#39;m not trying to dispute anything that&#39;s been said...
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post #14 of 42 (permalink) Old 06-19-2008, 09:59 AM
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I would have liked to see the PSI given for each tire variation given. You can manipulate to a certain extent the rollout from 2-4 PSI w/out stressing the sidewalls too much. Just a variable that I feel should have been given.

Great Info Vader and great clarrification Kojimep

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post #15 of 42 (permalink) Old 06-19-2008, 06:43 PM
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<div class='quotetop'>QUOTE (Vader @ Jun 18 2008, 11:56 AM) <{POST_SNAPBACK}></div>
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Down side to the brats besides price is that comp cuts slowly leak air (can be fixed by sealant, though) and they are usually 65-66" rollout, which is a good duning rollout but for hillshooting more rollout would be nice.[/b]
What about for drag&#39;s (Pismo drag), would a Skat with a higher RO have the upper hand on the Brats 65-66 RO? Doesn&#39;t Fullerton or one of the tire places, do something to the Brat that gives it a higher RO? I weigh in a heavy 240lbs if it makes a difference, which Im sure it probaly will.
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<div class='quotetop'>QUOTE (AOLTR450 @ Jun 18 2008, 01:00 PM) <{POST_SNAPBACK}></div>
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So much info I don&#39;t think I&#39;m ever going to buy paddles, there&#39;s too many variables and opinions!
Someone just tell me what to buy!! [/b]
I hear you. lol

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post #16 of 42 (permalink) Old 06-20-2008, 10:44 AM
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i&#39;ve been thinking about placing a basic model of a tire in a FEA program to see what that gives me for the approximate dynamic runout, i know they can do rotational speed input, and possibly rotational acceleration as well. i&#39;ll have to try contacting one of the companies like skat to see if they could give me approximate values for the young&#39;s modulus and poisson&#39;s ratio of the material they use in there tires, which i&#39;m sure they won&#39;t be too eager to share lol. still though, even with rough estimates it could be useful.

if it goes well i could then do more detailed models of the tires for more accurate results, would be fun to do in any case.
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post #17 of 42 (permalink) Old 06-20-2008, 11:09 AM
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I think vaders info was all anyone on here really needs to go by, we are all different weights, riding experience, so going into that much detail wont make to much difference playing on the hill or drags. if we all where running on actual drag strip with lights and timers, it would probably be a different story.. just my 02.....

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post #18 of 42 (permalink) Old 06-20-2008, 12:11 PM Thread Starter
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<div class='quotetop'>QUOTE (Jaydoggg @ Jun 19 2008, 09:59 AM) <{POST_SNAPBACK}></div>
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I would have liked to see the PSI given for each tire variation given. You can manipulate to a certain extent the rollout from 2-4 PSI w/out stressing the sidewalls too much. Just a variable that I feel should have been given.[/b]
I run all my paddles between 5-6 psi, so that is the range in all the tire pictures

<div class='quotetop'>QUOTE (LS1LTR @ Jun 19 2008, 06:43 PM) <{POST_SNAPBACK}></div>
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What about for drag&#39;s (Pismo drag), would a Skat with a higher RO have the upper hand on the Brats 65-66 RO?[/b]
As mentioned, testing different paddles with your own weight/quad is the only BEST way to set up your duner. I paddle for a combo general duning (w/ hills & bowls) and moderate hill-shooting/racing. I don;t ride at Pismo, but at Glamis, I only run the gecko flat drags every once in a while. The Brats do a great job of getting out of the hole at the beginning of the Gecko sand drags (loose / rutted sand) for sure.

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post #19 of 42 (permalink) Old 06-20-2008, 10:47 PM
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<div class='quotetop'>QUOTE (Vader @ Jun 18 2008, 07:56 PM) <{POST_SNAPBACK}></div>
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Down side to the brats besides price is that comp cuts slowly leak air (can be fixed by sealant, though) and they are usually 65-66" rollout, which is a good duning rollout but for hillshooting more rollout would be nice.[/b]
thanx for the respond bro hey i was told that the brats are not made for jumping at all is that true if thats the case then i would go with extreams with a 68 roll out now some people are useing a 8+8 wheel but what ive read 8+7 seems better what do you think i just dont want to buy the wrong set of paddles thanks for all your help .

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post #20 of 42 (permalink) Old 06-20-2008, 11:59 PM
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my 20x10x8 Skat Trak Extremes are a 60.5" rollout. a rather small tire. i am going 14 48 gearing.


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