An independent, free-to-use technical resource for off-the-road tyres in mining, earthmoving, civil construction, ag and industrial.
Search our growing catalogue by size, brand, pattern, TRA service code, machine fitment or compound. Direct links to manufacturer databooks.
/ 02 · ASK THE PORTALPlain-language answers and independent opinion on technical questions. Tyre for a machine. TRA code meaning. TKPH calculations. Mixing rules. With sources.
/ 03 · REFERENCEThe standards reference. TRA service code matrix. Tyre naming systems. Mixing safety rules. Failure mode glossary. AS4457 summary.
/ 04 · CALCULATORSCalculate heat-capacity matching for haul truck tyres. WCF for loaders. Pressure adjustments for altitude. Cost-per-tonne and cost-per-hour models.
/ 05 · MARKET NOTESIn-depth pieces on industry shifts. reported Yokohama-Goodyear consolidation. Tier-one vs mid-tier brand trade-offs. Pilbara supply dynamics.
/ 06 · DAILY INTELLIGENCEA sample briefing format on OTR tyre industry news (illustrative, live feed not yet operational). Manufacturer moves. Regulatory shifts. Supply dynamics. Plus a firehose of source RSS.
The default loader tyre across CAT 980-988, Komatsu WA470-WA500, and equivalents. 25" rim, radial, range of compounds.
/ SIZE · L-5Wheel loader tyre for CAT 994, Komatsu WA1200. 45" rim, radial, heat- and cut-resistant compounds.
/ TRA CODEStandard rock tread for haul truck applications. Tread depth, intended use, machine fitment, and compound considerations.
/ MACHINEWheel loader fitment guide. Standard tyre size 35/65R33. Common patterns, compound options, TKPH considerations.
/ CALCULATORCalculate the Tonne Kilometre Per Hour rating you need for a given haul cycle, then match it to manufacturer TKPH ratings.
/ REFERENCECan you mix radials and bias on the same axle? Across axles? Across positions? The rules from AS4457 and OEM guidance.
OTR Earthmover Tyre is the public technical reference site maintained by Jewell Tyres, Australia and New Zealand's independent specialist in big tyres since 1975. Free to use, ad-free, and not aligned to any tyre manufacturer. Note that this site is maintained by Jewell Tyres, which trades these tyres commercially, "independent" here means independent of every tyre manufacturer, not disinterested.
Most of what's published about OTR tyres lives in manufacturer databooks, manufacturer-aligned, behind PDF downloads, not searchable, not cross-referenced. We've spent decades collating this material to do our own job. This site is that working knowledge, made available.
This reference site exists to help you make better decisions. When you're ready to buy a specific tyre, sell surplus stock, or source one that's hard to come by, Jewell Tyres trades the inventory.