What is the larget rear tire size I can put on a 2008 SERK? Looking at ME880. Thanks....
I assume you want to stay with the stock wheel since you didn't say otherwise, so you will be very limited when replacing tires on the SERK. The stock tire is a 170/60R17 78H. Metzeler has a ME880 in that size and load range, but very little else in a 17" diameter. They have a 200/50R17 or 210/50R17, but they won't fit on your stock rim. I have no idea if they would fit the chassis even if you went to a wider rim.
Click on the attachment for the ME880 data sheet.