20 on the back would be OK......I went 15 all around. Keep in mind, with the type 2, you'll need clearance in the back of the wheels. On the sport, the rear works, the front doesn't. You may have to go with the type 1 and stud replacement (I have a thread in the DIY) Check my pics here to get an idea: Front and Rear Spacers: 15mm album | Ttschwing | Fotki.com
sup mod shack.... i have a question about wat size would be good for me for spacers? i dont have the touring rims... so yah would 25mm be to much for the rear and itll stick out? thanks so much mod!!!