TABLE A-1
Radial Ply
Agricultural R-2 Tractor Drive Wheel Tires
TIRES USED AS SINGLES
TIRE TYPE NOMENCLATURE
Code No. Tire Type
R-2 Cane & Rice, Drive Wheel, Deep Tread
 
MAXIMUM SPEED — 25 MPH (40 KM/H) - SPEED SYMBOL A8
TIRE SIZE DESIGNATION TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES
psi
kPa
*6
*40
8
60
10
70
12
80
14
100
16
110
18
120
20
140
22
150
24
160
26
180
28
190
30
200
              *     * *     * * *
16.9R28lbs.2150254029103200352037404080 (129)430045404940 (136)508052005520 (140)
 kg975115013201450160017001850 (129)195020602240 (136)230023602500 (140)
16.9R30lbs.2200260030003300364038604180 (130)440046805080 (137)520053605680 (141)
 kg1000118013601500165017501900 (130)200021202300 (137)236024302575 (141)
18.4R28lbs.2540300034203860418045404800 (135)520055205680 (141)600064006600 (146)
 kg1150136015501750190020602180 (135)236025002575 (141)272529003000 (146)
18.4R38lbs.3000352039604400480052005680 (141)600064006600 (146)695074007600 (151)
 kg1360160018002000218023602575 (141)272529003000 (146)315033503450 (151)
18.4R42lbs.3080374041804680508055206000 (143)640066006950 (148)740076008050 (153)
 kg1400170019002120230025002725 (143)290030003150 (148)335034503650 (153)
18.4R46lbs.3300386044004940536058406150 (144)660069507400 (150)785080508550 (155)
20.8R38lbs.3640430048005360584064006800 (147)715076008050 (153)855088009100 (157)
 kg1650195021802430265029003075 (147)325034503650 (153)387540004125 (157)
20.8R42lbs.3740454050805680615068007150 (149)760080508550 (155)880093509650 (159)
 kg1700206023002575280030753250 (149)345036503875 (155)400042504375 (159)
 kg1500175020002240243026502800 (144)300031503350 (150)355036503875 (155)


TIRE SIZE DESIGNATION TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES
psi
kPa
*6
*40
9
60
12
80
15
100
17
120
20
140
23
160
26
180
29
200
32
220
35
240
38
260
41
280
44
300
46
320
 
320/90R46lbs.2150260030003420386043004800508052005360552058406150640066006950 @ 52
 kg975118013601550175019502180230023602430250026502800290030003150 @ 360
 LI               (148)
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