RIM and TIRE QUESTION
5th Gear
Joined: Dec 2004
Posts: 6,486
From:
RE: RIM and TIRE QUESTION
ORIGINAL: Yuikio
He's right you know. There's a good technical reason, too, but I'm too lazy to look it up and too stupid to remember it. 
ORIGINAL: headshok2002
Tire diameter is the ONLY concern for quattro. That's it! Not weight, not colour, not ANYTHING.
Tire diameter is the ONLY concern for quattro. That's it! Not weight, not colour, not ANYTHING.
Quattro is all mechanical... and its job is to keep all 4 wheels spinning at the same speed. If you put on rear tires that have a larger overall diameter than the fronts, then the fronts will ALWAYS be spinning faster... and it'll ALWAYS be trying to send torque to the rear to compensate. Your diff would overheat, and explode, killing dozens!
I might have used a little imagination at the end there...
1st Gear
Joined: Jul 2005
Posts: 391
From: Houston TX
RE: RIM and TIRE QUESTION
ORIGINAL: Shaunp05
yeah you right but a tire with the same Width same height but
different profile will have a different turning radius
Which will Affect the Q system
yeah you right but a tire with the same Width same height but
different profile will have a different turning radius
Which will Affect the Q system
5th Gear
Joined: Dec 2004
Posts: 6,486
From:
RE: RIM and TIRE QUESTION
ORIGINAL: Shaunp05
Why dont you go with a rim with a deeper Dish ?
Why dont you go with a rim with a deeper Dish ?
Profile doesnt matter damnit! OVERALL DIAMETER. T.H.A.T. I.S. I.T.
MMmkay?
1st Gear
Joined: Sep 2005
Posts: 5
From:
RE: RIM and TIRE QUESTION
Now that the diameter question has been cleared up, I was wondering if running 19x8.5 all the way around will be alright as far as rubbing is concerned. I have a 2002 A4. Another question I have that is related to that is, I want to lower the car. What springs will get me the lowest drop? I want to be sitting right at the tire with 19s.
5th Gear
Joined: Dec 2004
Posts: 6,486
From:
RE: RIM and TIRE QUESTION
There are some people on here with 19's... somebody should chime in. PM Pops, he should know. I think he's even staggered... haha!
But yeah, just get coilovers, that'll allow you to fine tune the height adjustment.
But yeah, just get coilovers, that'll allow you to fine tune the height adjustment.
1st Gear
Joined: May 2005
Posts: 414
From:
RE: RIM and TIRE QUESTION
Just so this doesn't keep coming up, tire diameter is calculated like this:
225/40R18
225=tire width in milimeters
40=aspect ratio; each sidewall measures 40% of the tire width (225mm) don't forget there are two sidewalls
18=wheel diameter in inches.
So for the overall diameter:
(225*.40*2)/25.4+18=25.09in
Height of both sidewalls divided by 25.4 (number of milimeters in one inch) plus the wheel diameter equals total tire diameter in inches
225/40R18
225=tire width in milimeters
40=aspect ratio; each sidewall measures 40% of the tire width (225mm) don't forget there are two sidewalls
18=wheel diameter in inches.
So for the overall diameter:
(225*.40*2)/25.4+18=25.09in
Height of both sidewalls divided by 25.4 (number of milimeters in one inch) plus the wheel diameter equals total tire diameter in inches