Testing wheel width vs. tire width
10-18-2012 | 05:18 PM
#4
Joined: Jun 2006
Posts: 29,085
Total Cats: 375
From: Republic of Dallas
205s on 8s faster
225s on 8s fast...some debate here, probably not faster than a 205, but definitely feels like **** and I'd never drive on it because I demand perfection in my life, and recieve it.
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10-18-2012 | 05:25 PM
#5
225s on 9s fastest set-up on Earth. Audi runs this on the R18 e-tron, I run this on my Bugatti.
205s on 8s faster
225s on 8s fast...some debate here, probably not faster than a 205, but definitely feels like **** and I'd never drive on it because I demand perfection in my life, and recieve it.
205s on 8s faster
225s on 8s fast...some debate here, probably not faster than a 205, but definitely feels like **** and I'd never drive on it because I demand perfection in my life, and recieve it.
Full disclosure: I run 245s on 8s on two of my cars and it works well. Ideal? Probably not. Complaints? Nope.
But really... i know Emilio tested this and it's driving me insane that i can't find the write-up.
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10-18-2012 | 05:32 PM
#7
Joined: Jun 2006
Posts: 29,085
Total Cats: 375
From: Republic of Dallas
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10-18-2012 | 10:03 PM
#14
I'm Miserable!
Joined: Jun 2010
Posts: 320
Total Cats: -7
From: Okinawa Japan
And bro.. here you go
Originally Posted by emilio700 View Post
1. Increased tension on sidewall reduces unwanted deflection and distortion.
a. Quicker steering response
b. Reduce camber loss from sidewall deflection
c. More linear steering response at max slip angle
2. Increased air volume
a. Lower pressures allow tread to conform to road surface better, improving grip.
b. Increased air volume temperature fluctuates less with thread heating/cooling.
3. Contact patch is increased by decreasing psi loading per unit area (lower air pressure and wider rim). Imagine pressing hard inflated basketball onto ground or mostly deflated basketball onto ground.
a. By lowering loading per unit area, total friction potential per unit area is increased.
b. Tire wear pattern is more even
c. Tire wear rate is improved
In general, a Spec Miata with 205/50 NT01's on 15x7's will run around 39psi hot. The same car with 225/45's on 15x9's will run around 30psi hot
and generate about .25g more lateral grip
In short, the same answer I reply to about 5 emails a week: "9's are faster"
1. Increased tension on sidewall reduces unwanted deflection and distortion.
a. Quicker steering response
b. Reduce camber loss from sidewall deflection
c. More linear steering response at max slip angle
2. Increased air volume
a. Lower pressures allow tread to conform to road surface better, improving grip.
b. Increased air volume temperature fluctuates less with thread heating/cooling.
3. Contact patch is increased by decreasing psi loading per unit area (lower air pressure and wider rim). Imagine pressing hard inflated basketball onto ground or mostly deflated basketball onto ground.
a. By lowering loading per unit area, total friction potential per unit area is increased.
b. Tire wear pattern is more even
c. Tire wear rate is improved
In general, a Spec Miata with 205/50 NT01's on 15x7's will run around 39psi hot. The same car with 225/45's on 15x9's will run around 30psi hot
and generate about .25g more lateral grip
In short, the same answer I reply to about 5 emails a week: "9's are faster"
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