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Originally Posted By: Injured_Again
Originally Posted By: d00df00d
Originally Posted By: Injured_Again
I agree with you that handling is more than just cornering performance, but I **strongly disagree** that wide tires hinder handling as you have defined it. I don't know who you are but unless you were someone like Lewis Hamilton in disguise, I would assume that Randy Pobst and the editors of Motor Trend magazine probably have more seat time than you do, and probably have access to more different vehicles as well. If you take a look at their "Best Driver's Cars" from the last three years, you will see that they are the Chevy Camaro Z28 in 2014, the AMG GTS in 2015, and the McLaren 570S in 2016. Of those three, only the McLaren wears tires that would be not be considered "steamrollers", but the second place vehicle that year was the Mustang GT350R, which had the widest front tires of every vehicle there.
http://www.motortrend.com/news/2014-motor-trends-best-drivers-car/
http://www.motortrend.com/cars/mercedes-benz/amg-gt/2016/2015-motor-trend-best-drivers-car/
http://www.motortrend.com/cars/mclaren/570/2016/2016-motor-trend-best-drivers-car/
I'm definitely not a professional in the relevant sense. Just an amateur with interests in vehicle dynamics and terminological precision.
Obvious response here: "Best driver's car" is not "best handling car."
Here's an example of "best handling car": http://www.caranddriver.com/comparisons/the-best-handling-car-in-america-for-less-than-100k-feature
1. Boxster Spyder
2. Elise SC
3. RX-8 R3
4. M3
5. GT-R
6. Z06
7. GTI
Here's another: http://www.m3forum.com/articles/Car_and_Driver_Sept_1997.pdf
1. M3
2. F355
3. NSX-T
4. Supra Turbo
5. Viper GTS
6. Corvette
7. 911 Carrera S
8. Boxster
In both cases, there's no correlation between tire width and finishing order. The lists are topped by cars with unremarkable tire sizes. The cars with the biggest tires end up mid-pack at best.
Then there's this -- Chris Harris takes a C63 AMG, swaps out all four wheels for space saver spares, and waxes poetic about the excellence of its chassis and how modern cars feel unexciting because they have too much grip: https://www.youtube.com/watch?v=HPh90yNX-mY
Yes, the GT350R and Z/28 have the biggest possible tires. I don't think there's any way to argue that either of those cars is more handling-focused than, say, a Cayman GT4 or 911 GT3, neither of which runs the biggest possible tires (at least in front).
The extra-focused versions of the Ferrari 360, 430, and 458 all run relatively narrow fronts -- 225 for the Challenge Stradale, 235 for the Scuderia, and 245 for the Speciale. Surely you're not proposing Ford and Chevy care more about how their hot pony cars handle than Ferrari cares about how their trackday specials handle.
With wider tires, a car gains lateral grip, which has obvious benefits. It'll have higher lateral G limits, better tire heat management (given good alignment specs), and more positive steering response (as long as the fronts are wide enough relative to the rears). In exchange, the car will have less forgiving limit behavior, less useful steering feedback, more useless NVH, more of a tendency to tramline, and worse behavior on a wet road. And then there's the tradeoff between lateral and longitudinal grip that comes with choosing a wider vs. longer contact patch. There's always a balance to be struck.
The tests you quoted are **SIX AND SEVEN YEARS OLD**. None of those cars exist today in the models that were tested back then, except for the GT-R. Technology has moved on, and has allowed great handling and driving vehicles while using "steamroller" tires.
The Motor Trend tests I quoted are the three most recent of their continuing annual tests. You'll notice that the fastest cars do not win. Instead, it is the vehicle that provides the combination of best handling and best driving enjoyment/involvement, to a professional race car driver and to editors of a major motorsports magazine. I think that holds much greater relevance to what is possible today with modern technology, rather than tests that are now six and seven years old.
Steamrolling tires=issues in power transfer to surface or cheaper way to avoid more expensive suspension solutions.
Originally Posted By: d00df00d
Originally Posted By: Injured_Again
I agree with you that handling is more than just cornering performance, but I **strongly disagree** that wide tires hinder handling as you have defined it. I don't know who you are but unless you were someone like Lewis Hamilton in disguise, I would assume that Randy Pobst and the editors of Motor Trend magazine probably have more seat time than you do, and probably have access to more different vehicles as well. If you take a look at their "Best Driver's Cars" from the last three years, you will see that they are the Chevy Camaro Z28 in 2014, the AMG GTS in 2015, and the McLaren 570S in 2016. Of those three, only the McLaren wears tires that would be not be considered "steamrollers", but the second place vehicle that year was the Mustang GT350R, which had the widest front tires of every vehicle there.
http://www.motortrend.com/news/2014-motor-trends-best-drivers-car/
http://www.motortrend.com/cars/mercedes-benz/amg-gt/2016/2015-motor-trend-best-drivers-car/
http://www.motortrend.com/cars/mclaren/570/2016/2016-motor-trend-best-drivers-car/
I'm definitely not a professional in the relevant sense. Just an amateur with interests in vehicle dynamics and terminological precision.

Obvious response here: "Best driver's car" is not "best handling car."
Here's an example of "best handling car": http://www.caranddriver.com/comparisons/the-best-handling-car-in-america-for-less-than-100k-feature
1. Boxster Spyder
2. Elise SC
3. RX-8 R3
4. M3
5. GT-R
6. Z06
7. GTI
Here's another: http://www.m3forum.com/articles/Car_and_Driver_Sept_1997.pdf
1. M3
2. F355
3. NSX-T
4. Supra Turbo
5. Viper GTS
6. Corvette
7. 911 Carrera S
8. Boxster
In both cases, there's no correlation between tire width and finishing order. The lists are topped by cars with unremarkable tire sizes. The cars with the biggest tires end up mid-pack at best.
Then there's this -- Chris Harris takes a C63 AMG, swaps out all four wheels for space saver spares, and waxes poetic about the excellence of its chassis and how modern cars feel unexciting because they have too much grip: https://www.youtube.com/watch?v=HPh90yNX-mY
Yes, the GT350R and Z/28 have the biggest possible tires. I don't think there's any way to argue that either of those cars is more handling-focused than, say, a Cayman GT4 or 911 GT3, neither of which runs the biggest possible tires (at least in front).
The extra-focused versions of the Ferrari 360, 430, and 458 all run relatively narrow fronts -- 225 for the Challenge Stradale, 235 for the Scuderia, and 245 for the Speciale. Surely you're not proposing Ford and Chevy care more about how their hot pony cars handle than Ferrari cares about how their trackday specials handle.
With wider tires, a car gains lateral grip, which has obvious benefits. It'll have higher lateral G limits, better tire heat management (given good alignment specs), and more positive steering response (as long as the fronts are wide enough relative to the rears). In exchange, the car will have less forgiving limit behavior, less useful steering feedback, more useless NVH, more of a tendency to tramline, and worse behavior on a wet road. And then there's the tradeoff between lateral and longitudinal grip that comes with choosing a wider vs. longer contact patch. There's always a balance to be struck.
The tests you quoted are **SIX AND SEVEN YEARS OLD**. None of those cars exist today in the models that were tested back then, except for the GT-R. Technology has moved on, and has allowed great handling and driving vehicles while using "steamroller" tires.
The Motor Trend tests I quoted are the three most recent of their continuing annual tests. You'll notice that the fastest cars do not win. Instead, it is the vehicle that provides the combination of best handling and best driving enjoyment/involvement, to a professional race car driver and to editors of a major motorsports magazine. I think that holds much greater relevance to what is possible today with modern technology, rather than tests that are now six and seven years old.
Steamrolling tires=issues in power transfer to surface or cheaper way to avoid more expensive suspension solutions.