Now that you have selected your tire you will have to determine your pattern and frequency of spikes. On most tires you will want to put in one spike per knob but you do not have to spike every knob if you don’t want to. Obviously the more spikes you have the more traction you will get on ice. You can see in this photo that I skipped some of the center knobs in an alternating pattern of three knobs spiked and then two left empty. Leaving some knobs unspiked does save some weight and of course sometimes you don’t have enough screws to finish the job otherwise.
When you have your pattern all laid out and you know how you want it to be then it’s time to start drilling some knobs. It is nice to have something to drill into other than your hand or knee because that gets a bit messy after a few holes. I cut a pair of 2×4′s into a curved and slightly radiused shape that the tire sits on while I drill. See Photos.
You can use a regular drill with a 1/8″ drill bit but if you have a Dremel Tool that works even better. The slow speed of the drill tends to cut through the rubber which can lead to tears. The high speed of the Dremel Tool actually burns a perfectly cylindrical hole through and leaves no ragged edges. And as bonus you get to breathe in the burning rubber smoke. Whichever tool you have, drill all the necessary holes all the way around the whole tire. Try and hit the centers of the knobs as you drill them. A new and/or sharp drill bit makes a world of difference in starting each hole. It takes a little practice and you will probably find that you get better at it as you progress. I did.