Tractor · 1921Unverified
Best Thirty
Best Thirty — Agricultural Crawler tractor · 33 hp. Reference specifications; pending source verification.
Provisional listing — the headline figure is shown; full specifications are auto-generated and pending verification against published sources.
Rated power
33 hp
Max power
18.3 kW
Weight
3356 kg
Hover a source tag to verify
Overview
ManufacturerBestReference
Agricultural Crawler tractorReference
Built in San Leandro, California, USAReference
DrivecrawlerReference
Open operator station.Reference
Engine
Best 7.6L 4-cyl gasolineReference
Plows4Reference
Drawbar (tested)24.8 kWReference
Belt (tested)28.2 kWReference
BestReference
gasolineReference
4-cylinderReference
liquid-cooledReference
Displacement7.6 LReference
Bore/Stroke121 x 165 mmReference
Rated RPM850Reference
Belt power (max)22.7 kWReference
Max power18.3 kWReference
Belt power (max)24.3 kWReference
Max power19.4 kWReference
Belt power (max)28.2 kWReference
Max power24.8 kWReference
Transmission
2-speed gearReference
3-speed gearReference
TypegearReference
Gears2 forward and 1 reverseReference
Gears3 forward and 1 reverseReference
Dimensions
Weight3356 kgReference
TracksReference
Width135 cmReference
Height149 cmReference
Capacities
Diameter30 cmReference
Width17 cmReference
RPM800Reference
Speed765.96 meters/minReference
Test results
NTTL 77: 2-speed crawlerReference
NTTL 99: 2-speed crawlerReference
NTTL 104: 3-speed crawlerReference
2-speed crawlerMay 9 - 20, 1921Link: Nebraska Tractor Test 77 fileReference
Drawbar performanceReference
Max pull1969 kgReference
2-speed crawlerSeptember 11 - 24, 1923Link: Nebraska Tractor Test 99 fileReference
Max pull2236 kgReference
3-speed crawlerSeptember 15 - 22, 1924Link: Nebraska Tractor Test 104 fileReference
Max pull3430 kgReference
Values normalized to UK metric units. Every figure is traced to at least one source; verified specs are cross-checked against two or more.