There isn't really a right answer to your question, it depends on the type/size of tyres fitted and road conditions.

I'd start with the factory pressures which are 2bar front and 2.3bar rear, then add or subtract a little pressure and see how it effects the handling, braking and ride quality until you find a setting you're happy with.

In the summer I prefer slightly higher pressures 2.1bar and 2.4bar with my 16" Toyo T1R's, but in this colder wetter weather I've reduced the pressures back to standard.
