Forester: TPMS FTW, Redux

Now I know the Forester’s TPMS icon blinks on 1000 feet from a cold start with 12 psi in the offending tire. I returned home and pulled this from a sipe in the left rear tire:

Road debris - blade fragment
Road debris – blade fragment

It’s atop a 0.1 inch grid.

The flat side on the right rode tangent to the tire surface, recessed slightly below the tread, and pretty much invisible inside the sipe. Of course, the point punched through the tire’s steel belt and let the wind out, ever so slowly.

I initially thought it was a utility knife blade fragment, but under the microscope it looks more like a saw blade tooth. It’s obviously been kicking around on the road for quite a while; back in the day, they occasionally swept the roads, but that was then and this is now.

Makes me glad I didn’t buy four new tires after the last flat. I suppose installing two plugs in the same tire counts as a net loss, but they’re small, widely separated injuries and that’s how it’ll roll.

For the record: with 14 k miles on the tires, tread wear = 2/32 inch of the original 6/32 inch depth.

Those tires should last another 30 k miles at our current pace, although I expect more random debris will kill one stone cold dead before that.

3 thoughts on “Forester: TPMS FTW, Redux

  1. I wondered why you had the absolute worst luck with bike inner tubes. Now I know it’s all your pneumatic rolly thingies. New York must be a pretty rough place. :-)

    1. As nearly as I can tell, goathead thorns have nothing on the debris around here!

      Back when we commuted by bike I used heavy-duty tubes, mounted skimmers just over the tire treads, and generally didn’t have many flats.

      Those were the good old days…

  2. I’ve been lucky with Forester tires, but I’m pretty careful in winter. The studded snow tires don’t have the sensors installed, so I always get the yellow alert. And the 2016 tells Big Brother about it. Sigh.

    We usually don’t have too much trouble from road debris, modulo the occasional shredded tire leaving bits of steel belting all over the road. It’s the offroad that gets me; I’ve had several punctures from decades-old nails on the property. The tractor front wheels have tubes, ’cause there’s too many holes in them to let me use tubeless…

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