Show TEST OF TIRES ON HIGHWAYS results obtained by united states office of public roads after period of years in its testing of tires on country roads during a period of several years the united states office of public roads has prepared the road prior to each test by plowing grading and rolling thus with further consideration of moisture and atmospheric variations giving conditions as nearly identical as possible for each of the trips compared it was found that the draft decreased with increase of tire width zo lo a certain limit beyond which it increased As aa a result of the experiments it Is recommended that for ordinary farm work and general trucking the standard width of tire for a one horse wagon with gross load of 2000 pounds should be two inches light two hor horse 8 e wagon 2500 pounds two and one half inches medium two horse wagon pounds three inches standard two horse wagon pounds four inches heavy two horse wagon pounds five inches |