Choose R1 when the tractor’s job is field traction in soil, mud, or crop rows on sizes such as 12.4-24, 14.9-24, 14.9-28, 16.9-24, 16.9-30 or 18.4-30. Choose R4 when the same tractor lives on gravel yards, feedlots, loader work, and road time between sheds. Tractor tire R1 vs R4 for mixed farm work is a time-split question. If the machine is a loader tractor that only visits a field, R4 is usually the calmer tire. If the machine pulls implements in wet soil, R1 (or R1W) is the default. Do not put R1 on a yard tractor just because “farm” is in the RFQ. Do not put R4 on a tillage tractor just because it looks tougher in a photo.
Mixed farms break tires by using one spec for two days. Monday is wet tillage. Tuesday is gravel and a bucket. R1 lugs that bite soil also chew themselves on yard stone. R4 bars that survive the yard pack with mud in a field. You either split machines, split seasons, or accept a compromise and write it down.
China Baowu New Materials Co., Ltd. lists agricultural sizes in the tractor tire program. You will see 12.4-24, 14.9-24, 18.4-30 and related stamps. The R1 versus R4 code still has to go on your line. The size stamp does not pick the tread family.
Key takeaways
- R1 is a field lug. R4 is an industrial/farm-yard lug. Mixed work needs an honest time split.
- 12.4-24, 14.9-28 and 18.4-30 are size lines. They are not tread codes.
- Front and rear can differ, but both still need a named family.
- R1W is a wet-field variant of R1, not an R4 substitute.
- If the tractor is really a loader that farms on weekends, write loader-tractor, not “farm tire.”
How tractor tire R1 vs R4 for mixed farm work should be decided on the calendar
Tractor tire R1 vs R4 for mixed farm work should be decided by hours, not by identity. Count field hours versus yard and road hours. If field hours dominate, R1 on the rears is the usual call, with a matching front strategy. If yard and loader hours dominate, R4 on all four (or on the rears of a loader tractor) is the usual call. If the split is even, buy for the failure you cannot afford: stuck in a wet field, or chewed lugs on gravel.
A 16.9-30 tillage tractor and a 12.4-24 loader tractor on the same farm should not share one tread sentence. They can share one RFQ with two blocks.
UNECE vehicle regulations (2024) are the highway-side index if you also import PCR on the same account. They do not pick R1. Use UNECE vehicle regulations for that highway block only.
Field bite versus yard wear: what R1 and R4 do on the farm
R1 uses a long bar to bite soil and to self-clean in mud. On gravel, those bars can chip, cup, and wear the road side of the lug. R4 uses a more blocky, industrial pattern that lasts on yards and hardpack. In wet clay, R4 can pack and spin. R1W deepens or spaces the R1 idea for wetter fields. It is still a field tire.
Walk the decision:
- Read rear size (14.9-28, 16.9-24, 18.4-30, 18.4-38) and front size.
- Estimate field versus yard hours.
- Name soil: sand, wet clay, stubble, or mixed.
- Pick R1, R1W, or R4 per machine, not per farm name.
- Trial one tractor through the wettest month before a yearly freeze.
ISO earth-mover tyre overview (2023) sits next door when the same buyer also runs a 23.5-25 loader. Keep farm and OTR vocab separate. Overview: ISO ICS 83.160.99.
If the sizes are listed, send application, quantity and destination port via contact us. Write “tractor 18.4-30 R1 tillage” or “tractor 12.4-24 R4 loader” as separate rows.
A comparison table for mixed farm work
| Factor | Option A | Option B | Best for | Watch-out |
|---|---|---|---|---|
| Tread family | R1 / R1W | R4 | R1 field traction; R4 yard and loader tractors | One farm-wide spec |
| Rear size examples | 14.9-28, 16.9-30, 18.4-30 | Same sizes in R4 | Match OEM diameter first | Changing diameter to “get R4” |
| Front | Matching field lug | More industrial front | Follow the rear’s job | Mixing a deep R1 rear with a random skid pattern |
| Soil | Wet clay / tillage | Gravel / feedlot | R1W wet; R4 hardpack | R4 in deep mud |
| Neighbor product | Irrigation / implement | Skid steer 12-16.5 | Different machines | Putting skid R4 language on a 16.9-24 |
Bottom line: if the tractor pulls in soil, buy R1 (or R1W). If the tractor lives on stone and a bucket, buy R4. If it truly splits, prefer two machines or accept faster field wear on R4, in writing.
NHTSA tire pages (2024) are for highway equipment tires. They help only when the same wholesale program includes PCR. Link: NHTSA tires.
What mixed farms should stock so peak season does not stall
Stock the tillage rear size in R1 before the wet window. Stock the loader-tractor size in R4 all year. Common wholesale pairs are 12.4-24 with 14.9-24, and 16.9-30 with 18.4-30. Do not merge them into “24-inch farm.”
Ask for pattern photos before packing so an R4 block does not ship against an R1 line. Quality control is size, pattern and appearance. For agricultural, pattern is the whole buy.
If you also sell construction skid steers, keep 10-16.5 on the skid steer list. Farmers who own both still mix the names R4. Your bins should not.
Tractor tire R1 vs R4 for mixed farm work on the RFQ
Tractor tire R1 vs R4 for mixed farm work on the RFQ needs one row: machine (tillage tractor / loader tractor), size, R1 or R4, PR if you can read it, TT/TL, quantity, destination port. Soil in remarks. If you need irrigation or implement tires, add a second block from the agricultural tire parent, not as a tractor afterthought.
Questions buyers still ask
Is tractor tire R1 vs R4 for mixed farm work a 50/50 compromise tire?
No. There is no honest 50/50 tread that is both a wet-field bar and a gravel yard block. You split machines, split seasons, or pick the failure you will not accept. Write that pick on the RFQ.
Can I run R1 on the rear and R4 on the front?
You can if the machine geometry and the jobs match, but you are creating two wear stories. Many loader tractors run more industrial patterns all around. Many tillage tractors want field treads on the drive axle. Do not mix them just to use leftover stock.
Is R1W the same as R4?
No. R1W is a wet-field version of R1. R4 is a yard/industrial farm pattern. If your problem is mud in the field, look at R1W. If your problem is gravel eating bars, look at R4.
Does a larger size such as 18.4-30 replace the need to choose R1 or R4?
No. Width and diameter change flotation and load. They do not pick the bar style. An 18.4-30 R1 and an 18.4-30 R4 are still two products.
What ply rating should I put on the RFQ?
Copy the PR from the current sidewall if you can read it. If you cannot, give machine model class and typical ballast, and ask the desk to propose a PR, then freeze it. Do not invent a PR to look complete.
Tractor tire R1 vs R4 for mixed farm work is a hours split, not a farm identity. Next step: list tractor size, R1 or R4, field versus yard hours, quantity and destination port, then WhatsApp +86 131 7335 1630 or contact the desk. In mixed-farm files, the quietest fleets are the ones that stopped putting tillage tractors and loader tractors on one tread. That is experience. Sources used for mixed wholesale context are UNECE vehicle regulations (2024) and NHTSA tires (2024) on highway lines, plus the ISO earth-mover tyre overview (2023) when the same buyer also runs OTR loaders.