What is the bolt pattern and offset of the stock Tellus wheels on the XC?

I am upgrading to 17" wheels for summer use but the tire options are rather limited for this model. My choices seem to be:

1. Bridgestone S-03 Poles Position (225-55-17 - n/a in 235-55-55). Great performance reviews, noise a little iffy (I must have quieter tires than the stock Scorpions), and the short life expectancy looks unacceptable to me. The poor snow performance is OK for my use. This is the only true summer tire that fits.

2. Dunlop Sport A2 (235-55-17). Look to be reasonable "at the price" and durable, but I would like a little quieter tire with better peformance.

3. Bridgestone Turanzo Z Revo (235-55-17). Does not seem to be much superior to the cheaper Dunlop.

4. Michelin Pilot Sport A/S (235-55-17). Like 2 and 3, it is all season which I don't need at a much higher price (comparable in price to the S-O3 Pole Position). It does seem to have the all round superior specification I am looking for. However, being newly released, the feedback on Tirerack and elsewhere is very limited. The Tirerack test results are very good though.

I would greatly appreciate any experience and advice. Thanks.