I do not know for sure, but i think the offset is the same as a rzr 800, i looked on my invoice but did not see a part# for the wheels. I only drove the ace in the parking lot of the dealer with the stock wheels, so i cannot really say about the power loss, I wanted the wider stance also for stability! I accidentally ended up in a gully saturday night that I believe if i would have had the stock wheels and tires on, it would have rolled over on its side, one of my friends was standing there and could tip it up with very little effort! It was right on the edge of rolling!!! Glad I had the wider wheels and tires.