Hi and welcome to the Forum and to the Cub Family
. Now that is a subject my foot almost got to know extensively and personally this afternoon.
Changed tires on Granny. Old rims had the tubes pokin through....
Yup, wheel weights are a definite asset. For $75.00 go get em fast before somebody else finds out about them.
The rear wheel weights weigh approximately 150 lbs apiece and the front wheel weights weigh approximately 25 lbs apiece.
Do not attempt plowing snow without both front and rear weights.
The front weights help in stability and to keep the front end firmly on terra fima when you have implements on and they are very, very useful.
As for weights whilst mowing, you already have that answer. I would have thought that they would not be needed if you are using a belly mower, but I would definitely use them with the sickle mower.