Originally Posted by straightaway
Rounding the edge of foam tire after cutting? is this necessary and what will this do vs square edge? Thanks.
I have read the article posted, and all the replies and it doesn't look like anybody answered your question.
Josh mentioned in his article that it helps the tire break in quicker to the surface and that is because there is less tire contacting the ground. To me, the function of cutting pre-camber does more to break in the tire. Aside from that, there are two main things that putting a radius on the tires gets you. First is a smaller sidewall so you get less lateral grip. If you are on a track with terrible traction, you can put a smaller radius on your tires and this can help some. The second item is mainly to prevent chunking. If you go out with a 90 degree edge on your tires, the more prone you are to catching an egde and chunking your tire.
As for file types. The snake skin ones rock for doing nitro front tires. They can be a little too agressive for some rear compounds. I have a cheapo $1 file from Home Depot that works well. I also use an ancient rasp/file with less bite for softer compound tires when I race electric.