Tire size
20.8-34 Tractor Tires
20.8-34 is a bias farm tractor rear tire size with R-1 tread, used for heavy tractor.
New and used options. Tell us the quantity, your machine and where to ship.
20.8-34 tires listed now
Not what you need? We source more 20.8-34 tires than we list. Add the size to your quote list above.
What “20.8-34” means
- 20.8Section width: 20.8 in (528 mm)
- -Bias-ply construction
- 34Rim diameter: fits a 34-inch wheel
Where 20.8-34 is used
| Type | Tread | Construction | Typical use |
|---|---|---|---|
| Farm Tractor Rear | R-1 | Bias | Heavy tractor |
Buying 20.8-34 tractor tires
20.8-34 is a large rear tire for high-horsepower tractors. It is about 20.8 inches (528 mm) wide on a 34-inch wheel, the same width as the popular 20.8-38 but on a smaller rim, so it is shorter overall. It is found on heavy two-wheel-drive and front-wheel-assist tractors that pull tillage tools and haul.
The radial equivalents are 20.8R34 and 520/85R34. A radial gives more traction and less soil compaction at the same load, and it usually wears longer, which pays off on a tractor with a lot of field hours.
Easy to confuse
- 20.8-34 and 20.8-38 share the same width but fit different wheels. Always read the rim size, the last number on the sidewall.
- 18.4-34 vs 20.8-34: same rim, but the 18.4-34 is narrower and needs a narrower rim.
What to check
- Rim width: a 20.8 tire needs a wide rim. Check the marking on your wheel before changing size.
- Ply rating or load index: match or exceed your current tires, especially for duals and heavy drawbar work.
- Front-wheel-assist ratio: check it before changing rear size or construction.
- Used tires: ask for the tread depth as a percent, the date code and photos of both sidewalls.
Send the quantity, new or used, and the delivery location for a quote. Tires this size ship on freight.
What do 20.8-34 tires cost on our site?
We list 1 model in 20.8-34. One has a listed price: $1,516 per tire (Goodyear Dyna Torque II). Prices are per tire in US dollars and change with stock and season.
| Model | Tread | Load / ply | Price per tire |
|---|---|---|---|
| Goodyear Dyna Torque II | R-1 | D/8 ply | $1,516 |
How tall is the 20.8-34 tire?
The nominal overall diameter is about 69.4 in (1,762 mm), which gives a rolling circumference near 218 in (5,535 mm). That figure is an estimate that assumes an 85% aspect ratio, the usual rule for old inch sizes. Real tires vary by make and load, so treat it as a guide and use the tire diameter calculator or the lead-lag calculator before you change size on a front-wheel-assist tractor.
Is 20.8-34 a radial or a bias tire?
It is a bias-ply size. The dash in the size marks bias construction, which costs less and has stiffer sidewalls. See the radial vs bias guide.
Brands we source
- Michelin
- Bridgestone
- Goodyear
- Trelleborg
- BKT
- Firestone
- Titan
- Alliance
- Mitas
- Continental
- CEAT
- Yokohama Off-Highway
- Nokian Tyres
- Cultor
- Galaxy
- Carlisle
- Petlas
- Ascenso
- Maxam
- Ozka
Brand availability varies by size. Ask us which brands we can supply in 20.8-34, new or used.