Knobby Knife?

[GMP]

I got one and practiced on an old tire, then my kids tire. I learned that you have to look closely at the face of the knobs in relation to the base, and cut the same angle, not straight down. Don't take two much of a bite, it doesn't cut well if its too thick. I did an MT-16 before my last race and it seemed to work OK.

[(F5)]

Just realised my post looks like I sharpen the tyres with sand paper.

I meant the knife section should be touched up with sandpaper on a flat surface & rubbed as you'd sharpen a knife (if people still did that).

[forgiven]

Glad you said that...I was wondering...sandpaper...really...

Doesn't that clog up??