I'm currently running a 46x19 gear ratio, which should give me 19 skid patches if I'm not mistaken.

I've had my fixed gear for a little over a month, have ridden it quite a bit since then (around 5 long rides a week) and I'm a little confused as to how I wore a hole through my tire today.

I was skidding a decent when I first got it just to get the hang of it, as do ride brake-less currently. However, after the first week or two I stopped skidding everywhere, as I don't really have any need to stop on my rides (all rural roads).

I noticed that my tire was wearing very unevenly, and appeared to have one large skid patch with about 6-7 other smaller ones around the tire. Today on my ride I got a flat, went to look at my tire and the larger skid patch had worn through to the tube.

The tires were pretty cheap, and that would explain any premature wear. But my question is, why did my tire wear so unevenly? Is there something that I'm missing about skid patches, or was it possibly just really bad luck that I kept skidding in the same spot?

Thanks for the help!