TABLE A-3
Radial Ply
Agricultural R-1W Tractor Drive Wheel Tires
TIRES USED AS SINGLES
TIRE TYPE NOMENCLATURE
Code No. Tire Type
R-1W Drive Wheel, Wet Traction Tread
 
MAXIMUM SPEED — 25 MPH (40 KM/H) - SPEED SYMBOL A8
TIRE SIZE DESIGNATION TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES
psi
kPa
23 26 29 32 35 38 41 44 46
7.50R16lbs.123013201390148015701610171018201870
 kg.560600630670710730775825850
280/70R16lbs.143015201710182019302090220023402470
 kg.650690775825875950100010601120
7.50R18lbs.128013901480157016501710182018701980
 kg.580630670710750775825850900
280/70R20lbs.157017101870204021502340247026002760
 kg.7107758509259751060112011801250
300/70R20lbs.176019302090227024002600276029103080
 kg.800875950103010901180125013201400
360/70R20lbs.234025402760300032003420364038604080
 kg.106011501250136014501550165017501850
NOTES: 1: Bold face denotes maximum load for the Symbol shown and the corresponding Load Index number.
2: For shipping purposes, tire inflation pressures may be increased to 30 psi (210 kPA). Inflation pressure must be adjusted to correct operating inflation before operation.
3: At higher transport speeds (above 20 mph) and lower pressures (less than 12 psi) increased inflation pressure may be required for vehicle stability.
4: When used as Duals, tire loads must be reduced 12%; when used as Triples, tire loads must be reduced 18%.
5: The above loads are also applicable to equipment, including hillside combines, operating on slopes above 11° (20% grade). Load adjustments below 20 mph (30 km/h) in the adjoining table do not apply when operating on slopes greater than 11° (20% grade).
6: For hillside operations and for moldboard plowing with single drive wheel tires in the furrow, consult tire manufacturer for inflation pressure recommendations.
7: For cyclic loading field service, see Table F-1. For tire sizes not shown, see Note 3 on Table F-1.
8: For transport service and operations, which do not require sustained high torque, the following table applies:


MAX. SPEED

% CHANGE IN ABOVE

Change in Inflation Pressure
Stationary 189% +6 psi (40 kPa)
10 MPH / 15 KM/H +34% (except hillside combines) None
15 MPH / 25 KM/H +11% (except hillside combines) None
20 MPH / 30 KM/H +7% None
25 MPH / 40 KM/H NONE None
FOR RIM AND WHEEL LOAD INFORMATION, SEE IMPORTANT NOTES IN CHARTS I AND II IN GENERAL FARM TIRE INFORMATION