Ok so I found some bbs reps for a great price on craigslist and the guy does not know how wide they are, or the offset on them. He says that the tires are 225/45/17 and that they aren't stretched at all. Does anyone think that these will fit on a stock MCS with standard suspension? Thanks.

 

I run 215/45/17 tires on 17" x 7.5" rims with 45ET offset. And they fit perfectly almost like OEM.

With 225/45/17 you are looking at tires that are larger in diameter, and also wider. You'll be seeing more "bulge" on the tire compared to the stock 205/45/17.

Here are some tires that fit on 17" x 7.5" rims with high offset:
205/40-R17 (skinny tires, super low profile)
205/45-R17 (stock R56 size)
215/45-R17 (slightly wider contact patch than stock)
225/45-R17 (slightly wider contact patch with slightly more side wall bulge)
225/35-R17 (slightly wider contact patch with low profile looking side wall)

As for the dimensions of the rims, 17" x 7.5" or 17" x 8" wheels are the most common because they fit older Honda Civics no problem.
17" x 9" wheels do exist, but are less common and more expensive.
With that being said, since the wheels probably came off of a civic or other FWD car, the offset will be relatively high.
So hypothetically, the wheels should fit an R56 on stock ride height.

Other than you also want to make sure the size of the hub-bore is perfect, otherwise you will need hub-centric rings as well. Which might run you another $40 at the very most.

 

Thanks! So i found out that they're on a e30 318i that has 57.1mm center bore. I found rings on ebay from 57.1 to 56.1 so it should work. The wheels are only $400 with tires on them so I think I might have to pull the trigger on these things

 

If those are e30 fitment (not iX), then they probably have lower offset (et20) than the Mini fitment, depending on wheel width. I think that the 7 and 7.5 inch wide wheels for Minis should be ~et40 and ~et35, respectively. You may end up with the wheels sticking out of the wheel well or rubbing. If you want BBS reps from an e30 and retain the stock Mini fitment, look for wheels from an iX, which will have a higher offset.

 

That's a good deal for wheels + tires, just make sure that the tires are not 5+ years old.
And the offset is as cholyoke suggested.

The reason behind that is because the e30 is a rear wheel drive car, and they usually have much lower offset.
The e30 ix however is 4wd, and will have higher offset that will be close to MINI specs.

Now I'm not saying that 20ish offset WILL rub.
Because I've seen 25 offset with the same 225/45/17 on a R56 MINI that didn't rub.
It looked slightly more flush, which was nice

So in the best way would be to go and jack up your car and swap those wheels on.
Both front and back. And see for yourself if they rub, inside or outside, when going over bumps, or when you turn your steering lock to lock while driving.

But I have a feeling you'll be just fine

 

The size/offset should be stamped into the back of the wheel. I would insist on fitting them to the car before you purchase them to make sure they fit. The offset could cause issues.

 

True, but these are replica wheels.
He would be lucky if there is even a sticker, or what's left of it depending on how old the rims are
I've seen rep wheels without any indication of any specification and had to be measured the old fashioned way

But I agree with v10climber, always test fit the wheels and drive around the block (and make sure you do plenty of turns) before you hand the money over.