Cyclocross on a Hybrid Bike

Wanting to try cyclocross, I adapted my wife's hybrid bike. It is a Ridgeback Velocity that we bought in 2009. Here it is after being turned into a beginner's crosser. In the process, it lost 0.6kg, from 12.6 to 12.0kg. This is what I did to it:

-100g : Removed reflectors, bottle cage, bell
+100g : Replaced plastic cage pedals with metal Shimano MTBs
-300g : Replaced cushion saddle with a racier one, Vitus brand
-300g : Replaced Continental Contact tyres with Maxxis Raze 700x35C
+/-0g: New Clarks brake blocks

TOTAL : -600g

More photos below.

Heavy mud soon collects on the bike and on your shoes! Actually, I had scraped the worst of the mud off before taking these photos. It's a messy, but fantastic fun and a great workout.