Yes, It has a small nitrogen chamber but all the compression adjustment comes from the air chamber which I can adjust by adjusting psi...
So far I only have 25 miles on it and my top speed seems to be just around 30 on the flats, I was expecting maybe a couple MPH faster but I still have a long way to go on the break in, I am also running pretty aggressive tires which I am sure have quite a bit of rolling resistance.
Thanks,
Rob.