225/275?

[CubanJJ09]

is the 225/275 setup going to cause me problems?

if it is goin to cause problems, could i move the 255's to the front?

ill be using the stock rims and pontenza tires

im new to messing around with tires so any explanation would help, thanks in advance.

[Jay]

I like to try to balance out some of the "safe" understeer inherent in BMW's by evening out the tire widths. I try to maximize tread width while keeping the front and rear widths as close as possible. In my case, I end up with 245's front and rear. I'm not familiar with e92 stock widths, but you might have good luck going with 255's all around or a 245 or 255 front / 265 rear setup.

225 sounds pretty narrow - especially with 275 rears. I think I would only go with that size on a 7.5" wheel.

But if you're going for the staggered look... I'm of no help

[Timmahhh]

Like Jay was mentioning, it mainly depends on whether look or performance is the main concern. Going with a larger differential in size will cause you to have more understeer.

[CubanJJ09]

im not going to track it. im looking for more performance in a straight line.

and if you could please explain the 7.5" measurement thatd be super

thanks guys

[Jay]

Originally Posted by CubanJJ09

and if you could please explain the 7.5" measurement thatd be super

The width of the wheel in inches.

I will contend that you don't need to be a track guy to appreciate the benefits of reduced understeer.

[jfranci3]

More tire width doesn't necessarily give you more gription. You car's contact patch for a give corner is the corner weight / tire pressure (plus some factors dealing with the sidewall). So, by putting a wider tire on your carical you are just reshaping the contact patch. Assuming your car's suspension can use the tire efficiently, this may mean a tire will last longer because it comes in contact with the road less often and may operate at a lower temperature ( your BMW's short suspension links cannot, too much camber change = "Damn up passenger space!!!"), but will not give you more traction.
You can also run a lower tire pressure for a given tire, which makes it more compliant over road irregularities. It may make the tire forgiving, as it is easier for the tire to conform to the road under changing conditions. However, apparently longer contact patches are more forgiving when you ask the tire for too much while cornering.

If you want, supposed this thingie can do the maths for you if you're curious: http://www.ftire.com/

I'm no engineer, but I can look shit up on the internet. The people in this tread have fancy titles and exeriences. Go for the narrower tires

Peace out
Jon (who went from 245's to 275's)

[CubanJJ09]

after about 2 hours fuckin around on tire rack i found my dick dead in he mud. looks like im just going to get the one 255 i needed replaced. thanks for the help guys

[CubanJJ09]

well well well looks like i didnt search hard enough cause there is a potenzas 275/35 18" out there.... discount tires.com. but do i wanna go ahead and put them on? i like to open it up sometimes so safetys my number#1 but tis very tempting. thoughts? anyone really care at this point? i know i wouldnt but its my car

[CubanJJ09]

i ordered the 275 tires and am getting them mounted next week by A@L. so well see how this works out