I ran 22/20 setup last year and this year aswell. Widths were 44" front and 49" rear. This was a good setup but due to the narrow front , the xx hated railing berms. Kept trying to ride over the berm. This is with 4:1 front rims.
I have widened the front with +11/4 a-arms and this will cure the problem.
Something I did notice is putting 20x11x10 tyres on a 10x8 or 10x7 rim and running 8-10 psi , the tyre is still roughly about 22" tall.
Just my pennies worth.
