Tyre safety, some good links

[mowgli]

Here you go, a couple of links for fitting new tyres to the rear wheels and a PDF from ROSPA showing how tyres go "off" when the tread depth gets low:

http://www.michelin.co.uk/uk/auto/auto_cons_bib_pqr_neuf.jsp

http://www.rospa.com/roadsafety/info/tyre_tread_depth.pdf

I'm not sure if this in in the right place, you mods might want to shift it or make it sticky if you think its worth it.