am i asking a rare queston ?
any way .////// is the 15 " rims will fit into cooper S?
and if it run on the street ..i think the acceleration will be much faster than 17" , so as 16".....and ....also does any one have pics of cooper s with 15" on ?

 

I use 15" Konig Heliums on my 2006 'S' for autocross. At only 10.6 pounds per wheel, compared to about 21 pounds for my stock wheels, I can really tell the difference. Unfortunately, I don't have any pictures with the wheels installed.

 

Yup!!!

Check my gallery......Sorry for the mediocre pic quality....but the "rewind" titled pics show my 15 inch Konig Rewinds(graphite) on Harry, my 2006 MCS.
They are wrapped in 205/55/15 Kumho Ecsta SPT tires.......Daily driver.....love the grip and ride quality!!

 

Yes! I think many people have 15" wheels on Cooper S's. However, I think they look better lowered, so there is not as much wheel gap.

Here is a picture of my husband's MINI with 15" wheels:

 

15" wheels on an S is fairly common. Check these threads, and there are more:
https://www.northamericanmotoring.co...ad.php?t=75292
https://www.northamericanmotoring.co...ad.php?t=65324
https://www.northamericanmotoring.co...d.php?t=109549

 

Yeah what RKW said oh and the others

 

Check out my gallery. I've got a set of 15's that I use in the winter... They fit just fine and I love how they improve the ride quality.