Michelin has introduced WORKXBIB, an agricultural trailer tyre aimed at equipment such as tipping trailers, slurry tankers and manure spreaders. Announced on 8 October and covered by Farm Contractor & Large Scale Farmer on 12 October 2026, the launch focuses on machines spending substantial time on the road as well as in the field.
The initial replacement size, 600/55 R26.5, is being introduced this month. Michelin plans three further sizes for the second quarter of 2027. Availability for a particular UK trailer should be confirmed with the supplier rather than assumed from the announcement.
The practical question is not simply whether a new tyre is tougher. It is whether its specification matches the load, wheel, speed and work of the complete machine. A tyre upgrade cannot increase a trailer’s permitted weight, improve an inadequate braking system or change the road speed allowed for the tractor.
What the launch figures actually mean
Michelin quotes a load capability of up to 6,500kg at 65km/h for the 600/55 R26.5 size. That is a tyre performance statement, not permission to carry that load at that speed on every agricultural combination.
The company also claims up to 80% longer life than previous-generation Michelin trailer tyres. Its footnote describes customer testing of the same size against TRAILXBIB and CARGOXBIB HF, in trailer and slurry-tanker applications with predominantly road use. The testing included the UK and four other European countries. Michelin states that results depend on operating conditions.
Neither figure should become an unconditional promise in a purchasing budget. Ask the tyre specialist for the exact technical data and build the decision around your own operation.
Start with the actual duty cycle
A trailer moving between neighbouring fields does different work from a contractor’s tanker travelling many road miles each day. Record the proportion of road and field use, typical journeys, surface conditions, loaded running, gradients and seasonal peaks.
Include the awkward days: a heavily loaded return journey, muddy gateways, uneven yards and prolonged road travel. A specification chosen for an average day may be poorly matched to the busiest one.
Give this information to the tyre supplier and trailer manufacturer. Ask them to explain the proposed fitment’s limitations as well as its strengths, including any difference between road transport and field-operation settings.
Weigh the combination before selecting a rating
Do not calculate tyre loading by dividing a guessed trailer weight by the number of wheels. Load distribution, hitch loading, axle arrangement and uneven contents can change the weight carried by individual wheels.
Use suitable weighing facilities to establish representative loaded axle weights and the tractor-and-trailer combination weight. Include equipment, attachments and the normal working load. Where individual-wheel loading is relevant, obtain competent advice on how to measure it.
Check the trailer plate, axle limits, wheel rating, hitch capacity and tractor limits alongside the tyre specification. The lowest applicable limit matters. A higher-rated tyre does not authorise an increase elsewhere in the system.
Separate tyre capability from legal road speed
GOV.UK guidance says most tractors in Great Britain may travel at up to 40km/h, approximately 25mph. Some built to higher specifications may be permitted to reach 40mph, while wider agricultural vehicles can have lower limits.
The guidance also sets a 31-tonne agricultural tractor-and-trailer combination limit and an 18.29-tonne trailer limit, including load imposed through the hitch. The applicable rules depend on construction, dimensions and use; lower equipment limits still apply.
Check the exact tractor, trailer, braking arrangement and journey with the manufacturer or a knowledgeable adviser. The tyre’s 65km/h rating is not a shortcut around those checks. Northern Ireland has its own regulatory framework, so do not apply Great Britain guidance there without verification.
Obtain a written pressure and fitment plan
Correct pressure must come from the technical table for the exact tyre, load and speed, with the relevant manufacturer’s advice. Avoid choosing a familiar pressure from another machine or assuming that a larger footprint always justifies lower inflation.
Ask the fitter to confirm the approved rim, valve, clearances, overall dimensions and any effect on trailer height or operating width. Record the selected settings and provide them to the people who will operate and inspect the trailer.
If different field and road settings are appropriate, define how they will be changed and checked. A written plan is more useful than a verbal instruction that disappears when a seasonal driver takes over.
Treat fitting and inflation as specialist work
Large tyres store considerable energy. HSE warns that failures during inflation can cause serious injury or death and says tyre removal, replacement and inflation should be undertaken by competent staff.
Agricultural wheels may be too large for a conventional restraint. HSE says the safe system must restrain the wheel, contain the effects of an explosion and keep people outside the likely trajectory.
Arrange competent fitting with appropriate equipment. Do not improvise a roadside inflation or wheel-change procedure to save time. Include safe access, isolation, support and emergency arrangements in the job plan.
Compare the cost of useful service
Compare quotations on an equivalent basis: tyres, fitting, valves, disposal, transport, downtime and any wheel changes. Then assess cost per working hour or road kilometre using recorded wear and operating data.
Keep Michelin’s longevity claim as a manufacturer test result, not a guaranteed saving. Track condition, pressure checks, damage, repair history and removal reason after fitting. Review unexpected wear with the supplier rather than simply replacing the tyre again.
Give operators a clear handover
Brief everyone using the combination on its limits, inspection routine and defect-reporting process. Tyres are one part of readiness; brakes, lights, hitching, load security, visibility and the operator’s seat and restraint also need attention.
Farm Packs supplies seat covers for tractors and working machinery. Any cover should be selected for the actual seat and must not obstruct restraints, controls or adjustment. Cab protection does not compensate for an unsuitable tyre or an unsafe trailer.
The new WORKXBIB range offers another option for road-intensive agricultural work. The strongest purchasing decision starts with measured loads and a documented operating specification, then tests the commercial result in service. That approach remains valuable whichever tyre brand is chosen.
This article provides general information, not a fitment approval or replacement for manufacturer instructions, competent tyre advice, a safe system of work or jurisdiction-specific legal guidance.
Sources
Michelin: New WORKXBIB agricultural trailer tyre — 8 October 2026
Farm Contractor & Large Scale Farmer: Michelin launches new WorkxBib tyre — 12 October 2026
Department for Transport and DVSA: Tractors and regulatory requirements — updated 8 September 2023
HSE: Tyre removal, replacement and inflation — updated 17 September 2025
