Ive been down the road with rayco teeth, then the super teeth then green teeth 900 series and finally the greenteeth1100 series! if you are running a 65hp machine without a shadow of a doubt Greenteeth 1100 series all the way everday. I picked up a few extra pockets left right and straight counter bored and regular thread for each and some extra bolts and teeth and you will be grinding for a long time. as for the green and red teeth difference, they say the red is for softer wood and not so rocky ground, I sharpen my own teeth and have been for a very long time and I found that using the deeper dish red tooth will allow me to grind and still have a concave tooth to slice through nicely! Use a diamond wheel and a drill to sharpen, carefull of the dust use a mask and a fan to blow it away from you and others. These teeth are durable and can turn for a newer edge 3 times. I have been grinding with the same set up for over 2 years here in CT and it's rocky here and just broke last month my first set of teeth and bolts due to hitting a solid pipe property border rod that was solid steel about 1 1/2 inches thick. that sucked but other than that these teeth hold up for a long time. I grind with a Rayco RG Super 50 a 66 HP Diesel. Awesome! Do it you wont regret it!:msp_sneaky: