TIRE / RPM Chart
RPM Chart
(use 110% for stock class and 120% for modified stock) STD ALLIS CHALMERS A 1150 B, C, CA 1850 U 1200 WC, WD, WD-45 1720 WD-45 Dsl 1975 D-17 1995 CASE C, CC, D, DC L, LA SC 301, 311 VAC, 401 500, 600, 900 Gas 900 Dsl 1635 110% 1265 2035 1320 1892 2173 2195 120% 1380 2220 1440 2064 2370 2394 130% 1495 2405 1560 2236 2568 2594 STD MINNEAPOLIS MOLINE R, Z, 5-Star, GBD 1650 U, UB, G 1430 GVI 1740 OLIVER 60 70 80, 99 (4 Cyl) Su 55, Su 66 66 77, 88 99-GM 770, 880 H-P 28-44 WARDS Custom 110% 1815 1573 1914 120% 1980 1716 2088 130% 2145 1859 2262
1390 1200 1760 1948 1600 1500 1799
1529 1320 1936 2143 1760 1650 1962
1668 1440 2112 2338 1920 1800 2126
1807 1560 2288 2532 2080 1950 2126
1650 1640 1300 2200 1750 1750 1840 1950 1250
1815 1804 1430 2420 1925 1925 2024 2535 1375
1980 1968 1560 2640 2100 2100 2208 2535 1500
2145 2132 1690 2860 2275 2275 2392 2535 1625
2,075
2,283
2,490
2,698
COCKSHUTT 20 2000 30 1850 40, 50, 550, 560, 1850 570 FARMALL A, B, F-12, F-14 F-20, F-30, 10-20 C, SC, 200 300, 350 350-U H, Su H M, Su M, W-6 400, 450 460, 560 660 W-9, WD 9 W-40, WK-40
2200 2035 2035
2400 2220 2220
2600 2405 2405
Stock Class tire limit chart
(Firestone Field and Road tire chart shall be used for any tire size not on this list) 0-4500# class 170 sq. in.
1550 1350 1815 1925 2200 1864 1600 1600 1981 2030 1650 1925
1705 1485 1997 2118 2420 2050 1760 1760 2179 2233 1815 2118
1860 1620 2178 2310 2640 2237 1920 1920 2375 2436 1980 2310
2015 1755 2360 2503 2860 2423 2080 2080 2575 2638 2145 2503
11.2 x 36 - 115 sq. in 11.2 x 38 - 120 sq. in. 12.4 x 28 - 126 sq. in. 13.6 x 24 - 130 sq. in. 12.4 x 36 - 135 sq. in. 12.4 x 38 - 140 sq. in 14.9 x 26 - 144 sq. in 13.6 x 28 - 145 sq. in. 13.6 x 38 - 168 sq. in. 14.9 x 28 - 170 sq. in.
4501-6500# class 229 sq. in.
FORD 8N 2330 9N 2200 960 2450 Fordson Major Dsl1900 JOHN DEERE A, G, 60, 70-G B, 50 D R, 70-D, 620, 630 720, 730 820, 830 40, 420
2563 2420 2695 2090
2796 2640 2940 2280
3029 2860 3185 2470
15.5 x 38 - 189 sq. in. 14.9 x 38 - 200 sq. in. 16.9 x 34 - 229 sq. in.
6501-10500# class 300 sq. in.
1115 1375 980 1250 1250 2025
1227 1513 1078 1375 1375 2228
1338 1650 1176 1500 1500 2430
1450 1788 1274 1625 1625 2633
MASSEY HARRIS 33, 333, 444 1700 44, 44-S, 55 1500 101-JR (4 Cyl) 2050 101-SR (6 Cyl) 1980 Su 95 1740
1870 1650 2255 2178 1914
2040 1800 2460 2376 2088
2210 1950 2665 2574 2262
18.4 x 26 - 242 sq. in. 18.4 x 28 - 250 sq. in. 16.9 x 38 - 252 sq. in. 18.4 x 30 - 258 sq. in. 18.4 x 34 - 284 sq. in. 18.4 x 38 - 300 sq. in. 23.1 x 26 - 370 sq. in. (exception if factory available)