Disclaimer: Any modification done to wheels is potentially dangerous. If you do not know what you are doing then please do not
attempt. I have had no issues with the strength of my wheels but your results may vary. I am not responsible for anything that may happen to your
wheels or your car if you attempt this same modification. Don't try this at home!
Ok, so I was looking for wheels to put on my forester for this summer. I definitely wanted something wider than 7" and wanted something that had a
nice and clean OEM look. I really liked the look of the 2011 STi wheels made by Enkei. The problem was that they were 5x114.3 and also they were +55
offset which would most likely have some fitment issues with rubbing the struts. Thats when I went to look around and see what the thinnest adapter
I could have made would be.
I found a shop (motorsport-tech.com) that would custom make me 5x100 to 5x114.3 adapters down to 15mm. Using these adapters it would set the
wheel up to basically be a +40 18x8.5 which after some research looked to be quite optimal.I did a lot of measuring to see if the wheels would clear
the 5x100 studs. I also found some pictures of the 2011 STi wheel mating surface. This showed that it had large and deep pockets between the stud
holes. I had hope that I could pull it off!
Here are the adapters I had made, they are both hub centric and wheel centric:
I went ahead and bought the wheels and gave them a test fit. Unfortunately I still had some clearance problems! The lug nuts on the 5x100 studs hit the
sides of the pockets in the wheels:
After all the measuring I did I knew this might be a problem so I already had Plan "B" ready to go. I got out an air grinder and a spherical burr bit. I was
going to CNC the pockets but that would have taken a lot of time to mount the wheels and indicate them in. So I just carefully enlarged the pockets by
hand. I chose the spherical burr bit to reduce stress risers as it makes a really nice inside radius on the pockets:
The factory lug nuts are definitely too short to use with the extended studs the spacers came with but luckily I had thought about that and had a new
set of McGard two-piece spline drive lug nuts ready to go on!
2011 STi Enkei Wheels
245/40-18 Dunlop SP Sport 600
Pic showing what the offset looks like compared to the fenders:
Here are some pics of the wheels on the car: