Wheel & Tire Fitment Calculator
Compare your existing setup to a new wheel & tire combination β see poke, inset, diameter & height differences
Existing
Current setup
Tire
Wheel
New
New setup
Tire
Wheel
Overall Diameter
β
β
β
Circumference
β
β
β
Sidewall Height
β
β
β
Top-down suspension view β poke & inset profile
Existing
New
β¬
Inboard (vehicle body) Β· Hub face = zero reference Β·
Lower ET = more poke outboard Β· Higher ET = more inset Β· β‘ Outboard
Formulas:
Sidewall = width(mm) Γ (aspect Γ· 100) Γ· 25.4 Β·
Diameter = rim(in) + 2 Γ sidewall(in) Β·
Poke = wheelWidth(in) Γ· 2 β ET(mm) Γ· 25.4 Β·
Inset = wheelWidth(in) Γ· 2 + ET(mm) Γ· 25.4 Β·
Rev/mile = 63,360 Γ· circ(in) Β·
Speedo error = (newCirc β oldCirc) Γ· oldCirc Γ 100
| Measurement | Existing | New | Difference |
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