⚙️⚙️Tyre Size → Diff Ratio Planner

Tyre Size → Diff Ratio Planner

Restore stock gearing after bigger tyres

BDC_ADV

Vehicle preset (sets OEM tyre + diff ratio) Range Rover P38 – DSE (Diesel) Range Rover P38 – V8 (4.0 / 4.6) Custom (I know my values) Stock tyre size (e.g. 255/65R16) New tyre size (e.g. 285/75R16) Current diff ratio (e.g. 3.54) Candidate ratios (comma-separated)

Tip: use format 255/65R16 or 285/75R16.

How it works: Required diff ratio ≈ current ratio × (new tyre diameter ÷ stock tyre diameter). Bigger tyres = taller gearing = less wheel torque.

Recommended diff ratio (to match stock feel)

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Tyre diameter stock → new

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Speedometer error

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Wheel torque change

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Closest ratio from list

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Results are estimates. Tyre real diameter varies by brand/load/pressure. Always verify diff compatibility (carrier/spline/ABS/traction).