would stock 17inch AP2 tires fit onto 17inch CE28n(proper width and offset for s2k)

is it ok to run oem size tires onto aftermarket volk??

 

You didn't mention the width of the rims or offsets so I'll assume we are talking about 17x7.5 +50 and 17x9 +63.

Yes, your oem tires will fit those rims just fine without any issues.

A lot of people run wider tires in the back for better grip and to take advantage of the wider rims but this is not necessary.

Check out --> https://www.s2ki.com/forums/index.php?showtopic=342793 <-- to get an idea of what size tires you can run without any issues.

 

If the wheels are the 7.5 and 9 rear the OE tires will fit but you can also go with 225/45R17 and 255/40R17 as well.