We run 3/8" dia. chains purchased from JD on the rear R4 tires of our 3320 when we blow our gravel drive.
The ride is bumpier on hard frozen ground or the concrete garage floor but not noticable on snow or unfrozen dirt which the chains press into.
Because of the bumpy ride & looseness of the chains we do not go above 5mph with them on.
Hope this helps.