How much wider would a 275x40 be???
Thread Starter
5th Gear Member
Joined: Dec 2005
Posts: 2,634
From: SC
RE: How much wider would a 275x40 be???
Well, I know its 50 mm wider but, being put on an 8 inch rim may restrict that, I don't know for sure.. Maybe someone who has these mounted on an 8 inch rim can let me know.
ORIGINAL: 69mach1377
About 2 inches, 50mm mininum. Section width may increase more than that though.
About 2 inches, 50mm mininum. Section width may increase more than that though.
Thread Starter
5th Gear Member
Joined: Dec 2005
Posts: 2,634
From: SC
RE: How much wider would a 275x40 be???
Well, I just came across this site and according this this, a 275x40 should not be mounted on an 8 inch rim..
http://customwheelsmarket.com/rimwheelwidth1.html
http://customwheelsmarket.com/rimwheelwidth1.html
5th Gear Member
Joined: Nov 2004
Posts: 2,176
From: Insanity
RE: How much wider would a 275x40 be???
Here's a cut and paste with some info you might like:
This is a comparison of a 275 40 17 Drag Radial and a 255 40 17 KD.
AS you can see there is a small size difference
The 255 40 17 is mounted on a 17x8 rim and has a section width equal to just under 10 inches
The 275 40 17 is mounted on the same 17x8 rim and has a section widht equal to just about 11 inches
Now it is a little known fact that if you take a 275 40 17 tire and put it on a 17x8 rim it will actually measure up smaller than the same tire on a 17x10 rim (or even a 17x9) because of side wall 'suck in' <= techincal term
So now to the car:
As you can see, 17x8 4.75 backspacing with a 275 gives me plenty of clearance on the inside (remember now this is 11 inches wide which would be about the min any tire on a ten inch wide rim would be:
But now for the kicker
Stick out!
Different angle: http://www.dodgestang.com/DR/275-13.jpg
It is dissapointing though...since it actually fit quite nicely on the passenger side
Anyway......
Comparitive stances:
275s in the rear:
Another view: http://www.dodgestang.com/DR/275-10.jpg
255s in the rear
Another view: http://www.dodgestang.com/images/hires6.jpg
And now to blow your mind
Contact patch on 275s when mounted on a 17x8 and sitting at street pressure = 7.75 - 8 ish
Contact patch on 255s when mounted on a 17x8 and sitting at street pressure = 7.75 ish
granted I do get the benefit of a better compound and I do still run these tires at the drag strip, but I can't turn or hit a bump without rubbing. Good thing the strip is straight and flat Now in all fairness, when you are at the track you also air down drag radials a bit so the contact patch would increase, but with these two tires as an example, on a street I have gained nothing with the larger tire other than bragging rights, and have infact instead added headaches trying to get the larger to fit and wrok without threat of problems.
This is a comparison of a 275 40 17 Drag Radial and a 255 40 17 KD.
AS you can see there is a small size difference
The 255 40 17 is mounted on a 17x8 rim and has a section width equal to just under 10 inches
The 275 40 17 is mounted on the same 17x8 rim and has a section widht equal to just about 11 inches
Now it is a little known fact that if you take a 275 40 17 tire and put it on a 17x8 rim it will actually measure up smaller than the same tire on a 17x10 rim (or even a 17x9) because of side wall 'suck in' <= techincal term
So now to the car:
As you can see, 17x8 4.75 backspacing with a 275 gives me plenty of clearance on the inside (remember now this is 11 inches wide which would be about the min any tire on a ten inch wide rim would be:
But now for the kicker
Stick out!
Different angle: http://www.dodgestang.com/DR/275-13.jpg
It is dissapointing though...since it actually fit quite nicely on the passenger side
Anyway......
Comparitive stances:
275s in the rear:
Another view: http://www.dodgestang.com/DR/275-10.jpg
255s in the rear
Another view: http://www.dodgestang.com/images/hires6.jpg
And now to blow your mind
Contact patch on 275s when mounted on a 17x8 and sitting at street pressure = 7.75 - 8 ish
Contact patch on 255s when mounted on a 17x8 and sitting at street pressure = 7.75 ish
granted I do get the benefit of a better compound and I do still run these tires at the drag strip, but I can't turn or hit a bump without rubbing. Good thing the strip is straight and flat
Now in all fairness, when you are at the track you also air down drag radials a bit so the contact patch would increase, but with these two tires as an example, on a street I have gained nothing with the larger tire other than bragging rights, and have infact instead added headaches trying to get the larger to fit and wrok without threat of problems.
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From: Colorado