I run 175/70 r13s. When I had no money I ran cheapo Barrums and Silerstones. $59 each. This time I went all out. Well not really decided to pay an extra $15 for bridgestones. Feel much nicer too. The silverstones were actually a good tyre. Wore good and gave reasonable handling. They are still on the back serving out their days tortured of course.

When I first bought the datto it was running 165/75/13 of a decent brand. (Bridgestones) And they were pretty slippery. The extra 10mm made a huge diff. Also im sure though you could run a skinnier tyre but opt for a better tyre to accomodate.