Guides to tractor tyre pressure, front axle lead and tyres

Practical guides with formulas, worked examples and common mistakes. Each guide links to the right tab in the app so you can calculate for your own tractor.

• Tractor front axle lead – formula and worked examplesHow to calculate front axle lead (advance ratio) on a 4WD tractor: the formula step by step, worked examples with real rolling circumferences, the recommended 0.5–5 % range, common mistakes and the effect of wear.
• Tractor tyre pressure – field, road and loadHow to find the right tractor tyre pressure step by step: work out load per tyre, read the manufacturer's load and pressure table, choose field and road pressures, front loaders and dual wheels. With a worked example.
• Changing tractor tyre size – what must matchHow to change tyre size on a 4WD tractor: keep front axle lead in range, compare rolling circumference, rims, clearance and load index. Worked examples for a Case IH Puma 215.
• Soil compaction and tyre pressureHow tyre pressure and wheel load affect soil compaction in topsoil and subsoil, why low pressure helps, guide values for soil stress and practical ways to reduce compaction. With a worked example.
• Tractor axle load with implements and ballastHow rear implements, front weights and drawbar load change tractor axle loads. Moment-balance formulas step by step, a worked example for a Case IH Puma 215, ballast advice, load per tyre and pressure.
• How to read tractor tyre markingsHow to read tractor tyre markings: width, aspect ratio, R and rim diameter, load index and speed symbol tables (e.g. 158D), dual markings, inch sizes such as 16.9R38, IF/VF, CFO and tread types.
• Tractor tyre rolling circumferenceWhat rolling circumference and SRI are, why rolling circumference is smaller than the geometric circumference, how wear, pressure and brand change it, and how to measure it yourself step by step.
• Tractor tyre cost per hour – compare tyres properlyCompare tractor tyres by cost per operating hour and per hectare instead of purchase price. Formulas, a worked example, how to collect hours and what affects tyre life.
• IF and VF tyres – more load or lower pressureWhat IF and VF tyres are, how much more load or how much lower inflation pressure they allow according to manufacturers' tables, when they pay off and what to watch. Comparisons with real data.