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SVTPerformance's Chain of Restaurants
Road Side Pub
Why the heck are so many using ride-killing 20" wheels??
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<blockquote data-quote="Torch10th" data-source="post: 15587438" data-attributes="member: 15703"><p>If this was the case, you wouldn't see 33's, 35's what-have you on off-road vehicles. You wouldn't see large 33-35" tires on big slicks, because there are disadvantages to these types of tires. They take more power to turn because of that increase in moment of inertia. Why only increase width of the tire footprint when you can also increase length. </p><p></p><p>You obviously have to look at loading of the tire as well as inflation, but contact patch rules and if you're tying to go fast, having as much of it as you can is generally helpful. Since we're primarily talking about street cars here, adding tire height is the best way to do that as what you give up in rolling resistance is made up for in traction without having to run tires severely low on pressure.</p><p></p><p>If you want to contrast that versus a racing application, the NASCAR guys are a good point of reference. These guys run a pretty narrow tire by racing standards, so they have to gain contact patch elsewhere. They don't run large tire diameters either, so the way the accomplish greater contact patch is to reduce tire pressure. Again, they give up rolling resistance here, but any losses made there are overlooked by the greater grip level of the larger contact patch.</p><p></p><p>To really see the difference you'd have to plug your specific tire, size, pressure etc. into a footprint calculator. There's a reason though that OEM's are doing this. With a taller tire, small stiff sidewall and air pressures that are coming out of the factory near 40psi, you can maximize contact patch while reducing rolling resistance.</p></blockquote><p></p>
[QUOTE="Torch10th, post: 15587438, member: 15703"] If this was the case, you wouldn't see 33's, 35's what-have you on off-road vehicles. You wouldn't see large 33-35" tires on big slicks, because there are disadvantages to these types of tires. They take more power to turn because of that increase in moment of inertia. Why only increase width of the tire footprint when you can also increase length. You obviously have to look at loading of the tire as well as inflation, but contact patch rules and if you're tying to go fast, having as much of it as you can is generally helpful. Since we're primarily talking about street cars here, adding tire height is the best way to do that as what you give up in rolling resistance is made up for in traction without having to run tires severely low on pressure. If you want to contrast that versus a racing application, the NASCAR guys are a good point of reference. These guys run a pretty narrow tire by racing standards, so they have to gain contact patch elsewhere. They don't run large tire diameters either, so the way the accomplish greater contact patch is to reduce tire pressure. Again, they give up rolling resistance here, but any losses made there are overlooked by the greater grip level of the larger contact patch. To really see the difference you'd have to plug your specific tire, size, pressure etc. into a footprint calculator. There's a reason though that OEM's are doing this. With a taller tire, small stiff sidewall and air pressures that are coming out of the factory near 40psi, you can maximize contact patch while reducing rolling resistance. [/QUOTE]
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SVTPerformance's Chain of Restaurants
Road Side Pub
Why the heck are so many using ride-killing 20" wheels??
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