Compare front and rear tire sizes on staggered setups. See axle diameter mismatch, width delta, and AWD caution bands — free, private, instant, no signup.
24.97"
Front diameter
25.03"
Rear diameter
0.24%
Diameter mismatch
Preferred (±2%)
Band
+30 mm
Width delta
+0.03"
Ride-height delta
Mismatch is within a common ±2% window.
There is no universal AWD percentage we can certify. OEM tolerances vary and are often tighter than these commercial bands.
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Enter the front size and the rear size — the usual staggered pattern is a wider rear on the same or a similar rim. You get both overall diameters, the mismatch percent, and whether that delta sits in the Preferred ±2% or Acceptable ±3% band used for speedometer and AWD friendliness.
All-wheel-drive drivetrains dislike a rolling-radius mismatch. The workspace flags when front/rear diameter differs by more than about 2%, and again past 3%. That is a caution to match diameters, not a scan of your transfer case. RWD square setups can tolerate more width stagger if diameter stays close.
Besides diameter percent you see section-width difference in millimetres and the ride-height change from the diameter split. That is useful when the rear is 10 mm wider but you still need the fenders to sit level. Metric and flotation codes both parse.
No VIN and no upload. Two size codes stay in the tab. Close the page and they are gone. This does not model torque split, open diffs, or inner-fender clearance — measure those on the car after the diameters look sane.
Use the code you will (or do) run on the front axle. Metric or flotation.
Staggered rears are often wider. The checker compares overall diameter first, then width.
Preferred ±2% / Acceptable ±3% / Outside. AWD warnings appear when the split is large enough to stress the driveline.
A 10–20 mm wider rear is common if overall diameter matches. If diameter is off, plus-size or reverse-size the smaller axle instead of ignoring the percent.
Straight answers on privacy, limits, and how the workspace behaves.
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