ASTuning

I am ordering a set of HRE wheels in a 19x8.5" with a 36MM offest....and i plan on using pirelli's new 235/35-19 tire....does anyone have any experience with 19's on an A4....please dont comment on stupidity, i had plenty while putting 18's on my old Vr6 golf......just comments or questions..thanks

Steve S.

But that was for racing...I have been here a long time and the largest I have ever heard that anyone put on their street A4 is the 18"ers. Good luck. My 17" inchers are bouncy enough for me.<p>Steve S.<br>97 2.8QM<p>

AStuning

I have been considering the purchase of the A4 and have read cosiderably. The only thing I can say and this is just idle conversation, what is the OEM tire size for the car? Then, take it from there. Just figure the overall height of the stock rubber and then drop the profile of the new tires accordingly. Most cars have at least 1 to 3 additional inches that you can use still without rubbing the fenders. I would also call Tire Rack and speak to one of their reps. I put 235 40 and 285 30- 18s on my twin turbo RX7 and they called it spot on. I have yet to stump them when I call for information on what will and will not work. What is critical is the offset more so than the height. I hope that my mindless babble has helped if only a little.<p>Chris Valrkjosa@AOL.com

Steve S.

Plus zero would be 225/50/16<p>Plus one would be 225/45/17<p>Plus two would be 235/40/18<p>Steve S.<br>97 2.8QM

Flyboy

No a plus 2 is still a 225 tire not a 235. the tire width has nothing to do with it. A plus 3 is a 225 35/19.

Graham

Size does have something to do with it to get the correct rolling radius.<p>Per your arguement, if the stock tyre is a 205, then your plus 1, 2 and 3 tyres should also be 205's not 225 as you stated.<p>Graham - 235/40x17 or 225/45x17 or 215/45x17, all plus 2 from my stock 205/60x15

Steve S.

Out of the bushland ....comes Graham...how was your walkabout?

Fly Boy

O.K. here we go. That is correct, but the rollong radius would be unacceptable on any other size than the 225 45/17. The aspect ratio is simply the percent of the width of the tire. Here are ther numbers fo the rolling radius of each size.<br> <br>stock 195 65 15 634.5mm<br> 225 55 16 631.9mm acceptable for ABS<br> 225 45 17 634.3mm perfect match<br> 235 40 17 619.8mm unacceptable for Abs<br> 225 40 18 637 mm acceptable for ABS<br> 235 40 18 645.2mm unacceptable for ABS<p>Plus sizing simply means increasing rim diameter. I have not worked out the numbers for the 19in. but I can if you want. A 235 40 17 is too small in diameter to work correctly. Sorry but thats the facts.<p>

Graham

I hate to upset your facts, but I have had 235/40X17 on my car for the past 37000kms and that is a fact. No problems with ABS.<p>I do not know where you get your limits from for acceptability of ABS, but most work within +/- 3%, a fugure which also happens to be the legal difference a tyre can have (here in NSW Australia) before it is deemed illegal for raod use.<p>And consider this, the difference between a new tyre (say 8mm tread depth) and a fully worn tyre (but still legal, say 2mm depth ) is 12mm.<p>So, using your facts, a worn stock tyre will become unacceptable to ABS as its outside diameter (not rolling radius as you have stated, as a radius is half a diameter and the figures you gave we diameters not radii) wil be down to that of a new 235/40x17, which yuo state as fact as unnaceptable to ABS.<p>Then you also have to consider wheel width. A tyre can normally safely fit on a range on rim widths, which can vary from 1.5 to 3 inches depending on the tyre size. But guess what, each different rim width also varies the outside diameter and rolling radius.<p>And finally, there's the combination of tyre pressure, and vehicle weight which both affect the footprint of the tyre and the rolling radius and circumference, or revolutons per mile.<p>Now, having different rolling radius on front and rear axles will cause ABS to have problems, as the axles will be rotating at different rates, again providing the difference exceeds the limit set in the ABS system. ABS systems have to have this tolerence to allow for different wear rates on front and rear axles, and also different rotational speeds on the same axle when cornering.<p>In reality, experience shows that all of the above will work correctly with the ABS, with only the 235/40x18 having a clearance problem with a lowered vehicle.<p>Thats the reality.<p>Graham<p>PS how about your real name and email address?? <br>

Fly Boy

The 235 40 17 is 2.3% smaller than stock. If as you state that 3% wear is the limit which I agree, then this is borderline. In about 6 months worth of driving this tire will be out of limits for the ABS. I'm sure the price of tee in china also effects the rolling diameter of a tire but the fact remains that the proper size tire for a 17 in. wheel is still a 225 45 17. A 235 40 17 isn,t even the second choice as far as rolloing diameter is concerned. A 245 40 17 is second. And If I wanted you to have my E-mail adress I would have given it too you in the first place.