Why Correct Rowcrop Specification Matters For Spring Spraying
Spring spraying is unforgiving. Row widths are set, growth is tender, and weather windows are short. Correctly specified rowcrop wheels keep the machine centred on tramlines, protect young plants, and reduce soil disturbance. A poor fit causes drift from misaligned tracks, side-load on hubs, tyre scrub, and lost time.
Fieldens OTR Ltd draws on 60+ years of engineering to build precise, durable wheel sets for tractors and self-propelled sprayers. Our ISO 9001 processes deliver repeatable accuracy and reliability. Explore our rowcrop wheel sets and learn more about our approach on the About page.
Pre-Quote Measurement Checklist: The Data We Need
Gather measurements before you request a quote. Use a tape, straightedge, callipers, and a camera. Note clearances around mudguards, booms, steps, and callipers. Photograph the hub face, brake callipers, steering arms, mudguards, and any guards or covers.
- Machine make, model, year
- Current tyre size, load index, speed symbol
- Rim size and offset (if known)
- Hub: stud count, PCD, centre bore, pilot or bolted
- Desired track width(s) front and rear
- Clearance constraints: mudguards, booms, ladders, steps
- Photos: hub face, callipers, steering arms, guards
Track Width: Define, Measure, And Match To Your Crop
Track width is typically measured centre-to-centre of the tyres. Outside-to-outside can be misleading, especially with different tyre brands or wear. Start with hub-to-hub measurements, then calculate wheel offset and tyre section width to set the final centre-to-centre track.
Common UK targets include 1,500 mm, 1,800 mm, and 2,000 mm to match 50 cm, 60 cm, 75 cm, or 80 cm systems. Align front and rear tracks to reduce crop damage and scrub. Adjustable axles, flange spacers, and careful offset selection help you hit the mark. For a deeper overview, see how to choose the right agricultural wheels.
This image was generated with AI and may not always represent the product or service exactly.
Offsets, Centres, And Hub Details: Getting The Geometry Right
Offset (ET) is the distance from the rim centreline to the hub-mounting face. Positive ET moves the tyre inboard; negative ET moves it outboard. Dish orientation (centre disc facing in or out) also affects track width, stability, and clearance. We set these precisely to achieve your target track and load path.
Measure the hub details accurately: stud count, PCD, centre bore, and whether the hub is pilot-located or stud-located. Check brake callipers, kingpins, tie-rods, portal hubs, and valve positions at full lock and full suspension travel. Good geometry avoids fouling and protects bearings.
Stability, Load Ratings, And Speed: Safe In-Field And On-Road
Choose tyres and rims that meet or exceed axle loads with full tanks and chemical payloads. Confirm load index, speed symbol, and rim width compatibility. Under-specification risks heat build-up, sidewall fatigue, and shorter service life.
Road speeds amplify heat and load cycles. Set pressures for both field and road, and review them as weather warms. We size wheels and tyres to deliver stability, durability, and consistent performance across the whole season.
Tyre Selection For Rowcrop Work: Sizes, Tread, And Brands
Popular narrow sizes include 270/95R54, 320/85R38, and 380/85R34. VF/IF constructions carry higher loads at lower pressures for better soil protection and comfort. Match tyre to rim width, machine weight, and road speed to avoid heat build-up and irregular wear.
Spring often needs a tread that clears wet soils yet runs smoothly on the road. Fieldens OTR Ltd supplies Michelin, BKT, and ATG options to suit your budget and workload. Explore our range of agricultural tyres and we’ll advise on the best pattern and construction for your sprayer.
Clearance Checks: Mudguards, Booms, And Steering Lock
Before ordering, verify clearances at full lock and full bump. Inspect mudguards and fenders through suspension travel. Check brake callipers, portal hubs, tie-rods, and kingpins with the proposed rim and tyre sizes.
- Turn lock-to-lock and watch mudguard and step clearances
- Confirm boom fold, hose runs, and ladder positions
- Protect valves from steps and debris; plan for ballast if used
- Clear crop residue points that may snag on narrow tyres
- Sign-off: no contact at full lock, full bump, and with boom folded
This image was generated with AI and may not always represent the product or service exactly.
Tyrefill And Puncture Prevention: Keep Spraying On Schedule
Row work runs close to hedges, flints, and tramline debris. Fieldens Polycoat Tyrefill eliminates flats, stabilises the casing, and maintains a consistent footprint across the spray window. It’s proven in industrial duty and ideal for high-uptime farm work.
Choose Tyrefill when puncture downtime is unacceptable. Note the added weight and firmer ride versus air. Plan for cure time in spring. Learn more about Tyrefill and scheduling options.
Precision Manufacturing And Fitting: ISO 9001 Quality
We build bespoke wheels with laser-cut centres to your hub pattern, offset, and dish orientation. Runout and concentricity are checked to tight tolerances. Our ISO 9001 system captures every step for traceability and repeatable fit.
Coatings include shot blast, prime, Polycoat protection, and durable finishes for long service life. We offer on-site fitting, torque procedures, and documentation. See how we work in manufacturing.
Lead Times, Ordering, And Seasonal Planning
Allow time for centre manufacture, coating, tyre sourcing, assembly, and any Tyrefill cure. Lead times vary with season, specification, and brand choice. Ordering early protects your spring spray window and transport dates.
For a fast quote, send measurements, clear photos, track width targets, axle loads, speed requirements, and tyre brand preferences. We offer UK-wide delivery and fitting. Ready to plan your set? Contact Fieldens OTR Ltd.
Fitting, Torque, And Maintenance: Keep The Set Working
Tighten to the specified torque in a star pattern. Re-torque after the first 10 hours, then at regular service intervals. Record all torque checks and wheel positions in your maintenance log.
Set pressures for field and road. Inspect wear across the tread to catch misalignment or under-inflation early. Off-season, store clean and dry, away from sunlight, with weight off the tyres where possible to avoid flat-spotting.
Common Pitfalls And How Fieldens Resolves Them
Typical errors include mis-measured PCD or centre bore, offsets that induce scrub, and rims too narrow for VF/IF tyres. We verify hub data before cutting, use templates where needed, and recalculate geometry to protect hubs and tyres.
Fieldens OTR Ltd resolves issues quickly with personal service and engineered solutions. If your machine has unusual hubs or tight clearances, we can assess on site and specify a reliable build.
FAQs
Can you match front and rear tracks on different axles?
Yes. We calculate offsets, dish orientation, and tyre section width to align tracks. Spacers or adjustable axles can help where needed.
What track width suits 50 cm or 75 cm rows?
For 50 cm rows, 1,500 mm is common. For 75 cm, 1,800–2,000 mm is typical. We confirm against your tyres and axle limits before finalising.
Do I need VF tyres on a self-propelled sprayer?
VF helps manage load at lower pressure, improving soil protection and comfort. We recommend VF where tanks, booms, and road speeds are high.
How long do bespoke rowcrop wheels take?
Lead times vary with season and specification. Allow time for centres, coating, tyre sourcing, assembly, and any Tyrefill cure. Order early for spring.
Is Tyrefill suitable for road use?
Yes, Tyrefill prevents punctures and stabilises the casing. Expect a firmer ride and higher weight than air. We advise on suitability per machine and route.
What torque should I use on wheel nuts?
Follow the machine maker’s torque spec. We supply torque values and a tightening guide with your wheel set and recommend a re-torque at 10 hours.