Go ahead Shimano, can 5, 6,7,8 and so on speed cassettes. Still won't stop me from taking apart cassettes to make one's that will work.
I learned to do this way back when they first came out. Back when Shimano had allen bolts holding the cassettes together way back in 94.
I certainly wish you the best of luck. This was to be my year to get into cyclocross and all I have is a mountain bike myself. A few injuries have slowed me down but there is always next year. Since I am new to the scene I am hoping I can sneak my mountain bike into a beginner's race. No reason to exclude me. This is a sport that needs new participation to be its lifeblood. Spec-ing folks like me out of it before the word GO is a bad thing.
Kind of a cross post here (no puns *ever* intended), but I had been looking for a 'cross bike for my 11 year-old daughter and wound up, with a lot of help, putting together an old, small mountain bike into a nice 'cross bike. Seemed relevent to this discussion! More details here --