10 Holes

I wouldn't go any wider than a 255 width, or you risk having way too much sidewall flex for it to be safe at all in handling.

I used to have 255/60/R15's on the back of my Notch (friggin' tall) and it worked okay, but the rear end was a little squirrelly in corners.
 
You can run 265/50s with no problems at all.

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