Faster Wheels & Tyres for my Cyclocross bike I ride a cyclocross bike for commuting but want it to go faster! Instead of buying a new road bike, I'm thinking about new wheels &amp; tyres. My journey is pretty flat at the moment.

The currents wheels are 700 * 35 and its using a 9 speed cassette with disk brakes.

So my question is, what are my options do I have , how small a tyre can I fit to the 35 wheel ?
Its not the size of the tyre, its the knobliness and the rolling resistance.

Assuming 35 is the tyre size then you have a 15-24 mm rim, based on this DT Swiss PDF  and maybe could go as far as a 20mm tyre.  This is rim width dependant though.

Realistically, a smooth 28-25 mm tyre will give you a more comfortable ride than a narrow tyre, and will roll just as fast if not faster.

CX bikes are fine for commuting - a road bike might be slightly faster but often takes away things like fender/mudguard mounts, or rack mounts which add to the overall comfort of your ride.