Originally Posted by ducnut
This is cool! I'm due for tires, this spring. I'm thinking I'll grow a pair and buy a groover, as I'm not happy with what's available in a 120/180.
Alright, this is the part where I get you to sign the disclaimer.
The Ideal groover comes with a #4 head. I used #6 head and blades which makes a 3/8" wide cut. It's pretty easy to follow the Shinko Raven's angular tread lines - just don't cut deeper than the existing grooves. I thought about cutting a groove to zig zag down the middle but I decided I didn't want to compromise the tire's upright highway wear.