djcollins

Greetings, I am new to this forum and hope to take delivery of my RS4 this Friday. I know the snow tire topic has been beaten to death but I have a question more specifically about Nokian tires. I need to get a set of rims and was thinking about the Hartmann 18" B5 RS4's that will fit without spacers. My question is what size tire can I put on those rims without screwing up any of the electronic or Quattro systems. I want to get Nokians but they only come in the following sizes...

225/40R18 92R XL
235/50R18 101R XL
235/40R18 95R XL
245/40R18 97R XL
255/45R18 103R XL

For those of you who run Hartmann's will any of these tire sizes work? Thanks for any help.

ScratchRob13

if the tires are all the same size then you wont screw anything up... narrower is better in snow

sparkhill

What I think you want to know is which tire has the closest circumference. Here are the numbers compared to stock.

225/40R18 (-3.6%) load rating may be inadequate
235/50R18 (+4.7%)
235/40R18 (-2.4%)
245/40R18 (-1.2%)
255/45R18 (+3.9%)

Choice 3 or 4 are your best bets. Personally, I would go with OEM 19's and 255/35-19 Dunlop M3's.

sbh tuned

Has anyone tried the 225/45-18 alternate winter size?

MarkFank

255/40-18 is a perfect minus size since it has the exact same circumference

JELRS4

255-40-18 is the way to go

sparkhill

If they manufacture the tire he is looking for in that size

djcollins

From those results it looks like the 245/40's are the way to go if I want the Nokian's. Does that -1.2% have any "real world" consequences? And will they fit properly? Thanks again for the help.

sparkhill

Your speedometer will read a little faster than your actual speed (read 60 MPH when traveling 59.3) but the Audi speedometers are typically a little fast anyway. The tire will be 10 mm narrower (5mm each side) and you will probably not notice much of a difference. Depending on the manufacturer, tires vary in width from their "rated" value a little.

sparkhill

Aesthetics aside, they should perform better than the wider sizes.