Oddly a front. Of course age would play into this but wondering if the cold temps and then bringing the bike in to the warmth, back outside - causing variance in pressure could have been the real cause. I was running them a 80 psi. Not further a mile of home when it 'kaboomed'. Was carrying a spare but I walked anyways.

[IMG]DSC_2647 by carrera247, on Flickr[/IMG]

[IMG]DSC_2646 by carrera247, on Flickr[/IMG]

[IMG]DSC_2644 by carrera247, on Flickr[/IMG]