Yes, it can. It can be reduced down to 1/4.
20 over 11
It is already reduced.
15/20 = 75%
3/5 = 60%
60/88 = 30/44 = 15/22
56/60 in simplest terms is 14/15.
You can but I would advise against it as this is an increase in overall diameter of 0ver 3% which is never advisable. If you want to go with a 60 series tire then get a 165/60-15.
no
Yes, 15/60 can be reduced to 1/4 by dividing both the numerator and denominator by 15.
30/225 = 2/15
Divide both numbers by their greatest common factor, 3.
1/5 (one over five).