Yup, 31x10.50-15.

From that picture, it looks like they'll fit fine. You might have to "modify" the bottom rear corner of the fender with a hammer, but not much.

 

I was doing a little research and remembered I have 3.42 gearing! Some people on the s10forum say 31s effect the 3.42 gearing negatively. You think 30x9.50R15 will still look good on mine?

 

Any step up in tire size will give you some loss in power. How much is acceptable is totally up to you. You'll definitely notice a difference with 31s, and a little less with 30s. People run much worse combinations, though, and still do fine. I think 30s would still look good, but it's your ride. I take no responsibility, lol.

 

Before the lift, I ran 30" Goodyear wranglers, aggressive tires, great traction and little noise. Fit great and looked good.

 

Purchased a set of Kenda Klever AT 30x9.50R15s for the Blazer today. They make little noise, look great, and feel great. Steering a tiny bit to either side grips a lot more than it use to. I'm greatly satisfied with the purchase! Got them from Delta World Tire. Tires and balancing plus fees cost $662. Here's the pics

 

Nice! Looks good! Great price too!!

 

NIce!

I'll be looking for a bit more aggressive tread on my next tires (30x9.5s).