Weird Tire Size 235/35/18?

[patburns101]

Got some great Michelin Pilot Sport tires, wanted to put them on my B6 S4 18" rims. I know stock is 235/40/18 and 225's will fit but will my 235/35/18's?

Any imput- Thanks

[mxrz]

Got some great Michelin Pilot Sport tires, wanted to put them on my B6 S4 18" rims. I know stock is 235/40/18 and 225's will fit but will my 235/35/18's?

Any imput- Thanks

Not good.

[dfwhockey17]

yes

[ryannorthcott]

yeah i was actually wondering this myself, like i know that a 40 profile is recommended but never really knew that that slight difference would even matter...

[AudiA4Turbo22]

Not good.

why?

they'll be just fine, the wheel is only 8" wide i run 235/35 on my 8.5" 19s and they look perfect. I have 245/40 18s on my 18x8.5 wheels and the tire wall was way too tall.

[whiteUSPflow]

They will be fine dont worry about it. Your speedo might be off just a little.

[mxrz]

It has nothing to do with the width of the wheel. Modern tires can easily stretch while retaining the exact diameter because it is maintained by the belts/wires inside the tire thread. 235/35-18 is a hair short of being a full inch smaller in diameter than what it should be (almost 4% smaller). Diameter affects speed, speed affects ABS, ABS affects ESP... The results can range from unpredictable engagement of ABS and/or ESP, to premature failure of components within these systems. Such failures would not be fixed under warranty.

[AudiA4Turbo22]

^^well i didn't think that 245 and 235 or 35 and 40 would make that much of a difference, but well if that's the case 215/25 18 it is lol jk.

[mxrz]

Oh yeah, it will also look like crap. Half an inch bigger gap between the fender arch and the tire, all around, will be noticeable.

[downhillracer]

235/35/18



no problems at all

[patburns101]

I know that last time I went to a tire shop they said I couldn't run 225's in the front and 235's in the back because it would wreak my awd. But I dont think this would?

[MaRsTaInAgE]

^^^ Looks fine to me Downhill. Paint looks nice and glossy too.

[Capt. Obvious]

You'd be better off with a 225/40. You CAN use the 235/35's, but just bear in mind what MXRZ mentioned, even though what he said is the doomsday scenario.

[20vturbo]

they will be fine The same car comes with different tire sizes from the dealer my original tires were this size from the dealer

[mxrz]

they will be fine The same car comes with different tire sizes from the dealer my original tires were this size from the dealer

No B6 comes with that size from the factory.

[jcg05c]

^ haHA

[A4A4A4]

3.67% diameter difference... personally I wouldn't do it.
http://www.1010tires.com/TireSizeCal...?action=submit

[dirtybrd]

It has nothing to do with the width of the wheel. Modern tires can easily stretch while retaining the exact diameter because it is maintained by the belts/wires inside the tire thread. 235/35-18 is a hair short of being a full inch smaller in diameter than what it should be (almost 4% smaller). Diameter affects speed, speed affects ABS, ABS affects ESP... The results can range from unpredictable engagement of ABS and/or ESP, to premature failure of components within these systems. Such failures would not be fixed under warranty.

Having a smaller or larger tire the same size on all 4 corners will not have any negative affects on the ABS or ESP! If the tires were different sizes frt. to rear, then it might. You haven't heard ANYONE on here say " i wrecked my car becuase my ABS and ESP were screwed up from running a 225 instead of the stock 235." The inputs are still the same from the sensors and as long as they're all getting along nothing bad will happen.

[mxrz]

You haven't heard ANYONE on here say " i wrecked my car becuase my ABS and ESP were screwed up from running a 225 instead of the stock 235."

Poor argument... Section width alone is meaningless. If you re-read my post, you'll realize I'm referring to the ratio (series), not the section width. 235/40 and 235/35 are significantly different in size than 235/40 and 225/40. Do the math, this can help: http://www.1010tires.com/TireSizeCalculator.asp

Having a smaller or larger tire the same size on all 4 corners will not have any negative affects on the ABS or ESP!

I'm sorry, but you need to read up on how ABS/ESP work, in relation to "indicated" speed of the vehicle. Changing tire diameter significantly (anything over 3%), will push the difference between indicated speed and actual speed beyond spec of any system that relies on that information to function (ABS, and ESP relies on ABS, so does ATC), therefore making them, in turn, operate out of spec, which "can" result in unpredictable operation under certain conditions (panic stops, loss of traction for whatever reason...). Feel free to call any engineering department of any car manufacturer, or tire maker, to confirm. Just because something didn't go wrong yet, doesn't mean it's safe or ok, especially if the manufacturer advises against it.

The inputs are still the same from the sensors.

Sensors produce output, not input. And this output is produced on one variable and one constant. The variable is the rotational speed of the wheel, the constant is what the car "thinks" the tire diameter is. If you change the constant, the output is no longer correct. A small difference is negligible, but that small difference ends at 3%. It's as simple as that.